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In September 2018, IBM announced a brand fresh product, IBM Db2 AI for z/OS. This ersatz intelligence engine monitors data access patterns from executing SQL statements, uses desktop studying algorithms to settle upon most reliable patterns and passes this recommendation to the Db2 question optimizer to exist used with the aid of subsequent statements.
computing device getting to know on the IBM z Platform
In can furthermore of 2018, IBM introduced version 1.2 of its computing device discovering for z/OS (MLz) product. here's a hybrid zServer and cloud application suite that ingests performance facts, analyzes and builds fashions that characterize the health popularity of quite a lot of warning signs, screens them over time and gives precise-time scoring capabilities.
a few facets of this product offering are aimed toward supporting a group of mannequin builders and managers. as an example:
It helps numerous programming languages reminiscent of Python, Scala and R. This allows facts modelers and scientists to Make utilize of a language with which they are everyday;
A graphical user interface known as the visible mannequin Builder publications model builders devoid of requiring enormously-technical programming advantage;
It includes dissimilar dashboards for monitoring model results and scoring capabilities, as well as controlling the outfit configuration.
This desktop discovering suite changed into at first aimed at zServer-based mostly analytics functions. some of the first evident choices become zSystem efficiency monitoring and tuning. gadget management Facility (SMF) records that are immediately generated through the working system deliver the uncooked facts for device aid consumption similar to critical processor usage, I/O processing, reminiscence paging etc. IBM MLz can compile and retain these records over time, and construct and train models of gadget conduct, score these behaviors, determine patterns not conveniently foreseen by means of people, enhance key efficiency indications (KPIs) and then feed the model effects again into the device to handle system configuration changes that can augment performance.
The next step turned into to establish into upshot this suite to research Db2 performance records. One solution, called the IBM Db2 IT Operational Analytics (Db2 ITOA) respond template, applies the computing device discovering expertise to Db2 operational records to profit an understanding of Db2 subsystem fitness. it might probably dynamically build baselines for key performance warning signs, supply a dashboard of these KPIs and give operational cadaver of workers precise-time insight into Db2 operations.
whereas usual Db2 subsystem efficiency is a vital component in universal utility health and performance, IBM estimates that the DBA champion personnel spends 25% or greater of its time, " ... fighting access route problems which antecedent performance degradation and service fill an upshot on.". (See Reference 1).
AI comes to Db2
trust the plight of modern DBAs in a Db2 environment. In modern day IT world they ought to aid one or extra big data applications, cloud application and database services, application setting up and configuration, Db2 subsystem and utility efficiency tuning, database definition and administration, catastrophe recovery planning, and greater. query tuning has been in actuality on account that the origins of the database, and DBAs are always tasked with this as smartly.
The coronary heart of query route analysis in Db2 is the Optimizer. It accepts SQL statements from functions, verifies authority to access the records, reviews the places of the objects to exist accessed and develops a list of candidate information access paths. These entry paths can comprehend indexes, table scans, a lot of desk combine strategies and others. in the records warehouse and big records environments there are usually further selections purchasable. One of these is the actuality of summary tables (on occasion referred to as materialized question tables) that comprise pre-summarized or aggregated statistics, as a consequence allowing Db2 to retain away from re-aggregation processing. a different option is the starjoin entry course, common in the statistics warehouse, the residence the order of desk joins is changed for efficiency motives.
The Optimizer then reports the candidate access paths and chooses the access path, "with the lowest cost." imbue in this context skill a weighted summation of useful resource utilization including CPU, I/O, reminiscence and other elements. finally, the Optimizer takes the bottom cost entry path, shops it in reminiscence (and, optionally, within the Db2 listing) and starts off entry direction execution.
big statistics and statistics warehouse operations now encompass utility suites that allow the enterprise analyst to utilize a graphical interface to build and manipulate a miniature information mannequin of the information they requisite to analyze. The applications then generate SQL statements based on the users’ requests.
The issue for the DBA
with a view to execute decent analytics on your dissimilar data outlets you requisite an excellent understanding of the facts necessities, an understanding of the analytical functions and algorithms attainable and a excessive-performance facts infrastructure. sadly, the quantity and placement of records sources is increasing (both in dimension and in geography), statistics sizes are transforming into, and functions proceed to proliferate in number and complexity. How may soundless IT managers champion this atmosphere, especially with probably the most skilled and mature workforce nearing retirement?
understand furthermore that a huge portion of decreasing the entire imbue of possession of these techniques is to acquire Db2 applications to Run sooner and more correctly. This usually interprets into using fewer CPU cycles, doing fewer I/Os and transporting less facts across the community. since it's frequently problematic to even determine which applications may odds from efficiency tuning, one strategy is to automate the detection and correction of tuning considerations. here is the residence desktop gaining learning of and synthetic intelligence will furthermore exist used to excellent effect.
Db2 12 for z/OS and synthetic Intelligence
Db2 version 12 on z/OS uses the computing device researching facilities mentioned above to accumulate and retain SQL question textual content and access direction particulars, as well as actual performance-related ancient guidance akin to CPU time used, elapsed times and outcomes set sizes. This providing, described as Db2 AI for z/OS, analyzes and outlets the facts in laptop studying models, with the mannequin evaluation consequences then being scored and made attainable to the Db2 Optimizer. The subsequent time a scored SQL commentary is encountered, the Optimizer can then utilize the mannequin scoring statistics as enter to its entry path option algorithm.
The upshot should soundless exist a discount in CPU consumption as the Optimizer uses mannequin scoring input to pick stronger entry paths. This then lowers CPU charges and speeds software response times. a major skills is that the utilize of AI utility does not require the DBA to fill information science talents or deep insights into query tuning methodologies. The Optimizer now chooses the most reliable entry paths based mostly no longer simplest on SQL question syntax and facts distribution statistics but on modelled and scored ancient efficiency.
This may furthermore exist particularly critical in case you rescue information in varied places. for instance, many analytical queries against big facts require concurrent entry to unavoidable information warehouse tables. These tables are often known as dimension tables, and they comprehend the information aspects constantly used to wield subsetting and aggregation. for example, in a retail atmosphere accept as loyal with a desk known as StoreLocation that enumerates every retain and its location code. Queries towards store sales statistics might furthermore requisite to blend or summarize income by course of area; therefore, the StoreLocation desk will exist used by some massive data queries. in this atmosphere it's ordinary to rob the dimension tables and duplicate them continuously to the massive facts application. in the IBM world this location is the IBM Db2 Analytics Accelerator (IDAA).
Now reckon about SQL queries from both operational applications, facts warehouse users and massive data company analysts. From Db2's perspective, bar nobody these queries are equal, and are forwarded to the Optimizer. youngsters, in the case of operational queries and warehouse queries they may soundless surely exist directed to entry the StoreLocation table in the warehouse. nevertheless, the query from the industry analyst towards big records tables should soundless doubtless entry the replica of the desk there. This effects in a proliferations of skills entry paths, and extra work for the Optimizer. luckily, Db2 AI for z/OS can supply the Optimizer the counsel it needs to Make judicious access route decisions.
the course it Works
The sequence of movements in Db2 AI for z/OS (See Reference 2) is often here:
during a bind, rebind, establish together or clarify operation, an SQL remark is passed to the Optimizer;
The Optimizer chooses the statistics entry course; as the option is made, Db2 AI captures the SQL syntax, access route option and question performance data (CPU used, and so on.) and passes it to a "studying assignment";
The learning project, which will furthermore exist carried out on a zIIP processor (a non-frequent-purpose CPU core that doesn't aspect into software licensing expenses), interfaces with the desktop discovering utility (MLz model functions) to store this information in a model;
because the volume of statistics in each model grows, the MLz Scoring service (which can furthermore exist executed on a zIIP processor) analyzes the mannequin facts and ratings the behavior;
throughout the next bind, rebind, prepare or clarify, the Optimizer now has entry to the scoring for SQL fashions, and makes acceptable changes to access direction selections.
There are additionally various consumer interfaces that provide the administrator visibility to the status of the accrued SQL remark performance information and mannequin scoring.
IBM's desktop studying for zOS (MLz) offering is getting used to high-quality upshot in Db2 version 12 to enhance the efficiency of analytical queries in addition to operational queries and their linked applications. This requires administration attention, as you must examine that your enterprise is ready to eat these ML and AI conclusions. How will you measure the prices and benefits of the usage of desktop gaining learning of? Which IT champion workforce should exist tasked to reviewing the result of model scoring, and perhaps approving (or overriding) the consequences? How will you assessment and justify the assumptions that the application makes about entry path decisions?
In different words, how well were you sensible your information, its distribution, its integrity and your existing and proposed entry paths? this will verify the residence the DBAs expend their time in supporting analytics and operational software performance.
# # #
John Campbell, IBM Db2 unique EngineerFrom "IBM Db2 AI for z/OS: raise IBM Db2 software efficiency with computing device studying"https://www.worldofdb2.com/events/ibm-db2-ai-for-z-os-increase-ibm-db2-utility-performance-with-ma
Db2 AI for z/OShttps://www.ibm.com/support/knowledgecenter/en/SSGKMA_1.1.0/src/ai/ai_home.html
Feb 19, 2019 (Heraldkeeper by the utilize of COMTEX) -- international ERP utility Market by means of producers, areas, class and application, Forecast to 2023
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Geographically, this record is segmented into a pair of key areas, with construction, consumption, revenue (M USD), market share and augment rate of ERP utility in these areas, from 2012 to 2023 (forecast), coveringNorth the united states (united states, Canada and Mexico)Europe (Germany, France, UK, Russia and Italy)Asia-Pacific (China, Japan, Korea, India and Southeast Asia)South the united states (Brazil, Argentina, Columbia)middle East and Africa (Saudi Arabia, UAE, Egypt, Nigeria and South Africa)global ERP software market competitors by suitable producers, with production, rate, income (value) and market share for each and every company; the perquisite players includingSAPOracleSageInforMicrosoftEpicorKronosConcur (SAP)IBMTotvsUNIT4YonYouNetSuiteKingdeeWorkday
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On the basis of product, this report shows the creation, revenue, expense, market share and growth expense of every category, basically split intoOn-premise ERPCloud ERPOn the groundwork on the conclusion users/applications, this file focuses on the fame and outlook for main applications/end clients, consumption (earnings), market share and boom cost of ERP utility for each and every utility, includingManufactureLogistics IndustryFinancialTelecommunicationsEnergyTransportation
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global ERP utility Market by producers, regions, classification and application, Forecast to 20231 report Overview1.1 Definition and Specification1.2 document Overview1.2.1 manufacturers Overview1.2.2 regions Overview1.2.3 classification Overview1.2.4 software Overview1.three Industrial Chain1.3.1 ERP software universal Industrial Chain1.3.2 Upstream1.three.3 Downstream1.four trade Situation1.four.1 Industrial Policy1.4.2 Product Preference1.four.3 financial/Political Environment1.5 SWOT analysis
four producers Profiles/Analysis4.1 SAP4.1.1 SAP Profiles4.1.2 SAP Product Information4.1.three SAP ERP application company Performance4.1.4 SAP ERP utility company development and Market Status4.2 Oracle4.2.1 Oracle Profiles4.2.2 Oracle Product Information4.2.three Oracle ERP application company Performance4.2.four Oracle ERP utility company development and Market Status4.3 Sage4.3.1 Sage Profiles4.three.2 Sage Product Information4.3.three Sage ERP software industry Performance4.3.four Sage ERP utility enterprise construction and Market Status4.4 Infor4.four.1 Infor Profiles4.4.2 Infor Product Information4.4.three Infor ERP utility company Performance4.4.four Infor ERP application company building and Market Status4.5 Microsoft4.5.1 Microsoft Profiles4.5.2 Microsoft Product Information4.5.3 Microsoft ERP application enterprise Performance4.5.4 Microsoft ERP utility company construction and Market Status4.6 Epicor4.6.1 Epicor Profiles4.6.2 Epicor Product Information4.6.three Epicor ERP software industry Performance4.6.4 Epicor ERP application company construction and Market Status4.7 Kronos4.7.1 Kronos Profiles4.7.2 Kronos Product Information4.7.3 Kronos ERP software industry Performance4.7.4 Kronos ERP software industry development and Market Status4.8 Concur (SAP)four.8.1 Concur (SAP) Profiles4.8.2 Concur (SAP) Product Information4.eight.three Concur (SAP) ERP software industry Performance4.8.4 Concur (SAP) ERP application enterprise building and Market Status4.9 IBM4.9.1 IBM Profiles4.9.2 IBM Product Information4.9.three IBM ERP utility industry Performance4.9.four IBM ERP software industry building and Market Status4.10 Totvs4.10.1 Totvs Profiles4.10.2 Totvs Product Information4.10.three Totvs ERP utility industry Performance4.10.four Totvs ERP utility industry development and Market Status4.11 UNIT44.12 YonYou4.13 Sage4.14 Infor4.15 Microsoft
12 Market Forecast 2019-202412.1 sales (okay contraptions), earnings (M USD), Market share and boom cost 2019-202412.1.1 world ERP software sales (ok instruments), salary (M USD) and Market share by using regions 2019-202412.1.2 global ERP application income (k units) and augment cost 2019-202412.1.3 Asia-Pacific ERP application income (k units), earnings (M USD) and growth cost 2019-202412.1.four Asia-Pacific ERP software earnings (ok gadgets), salary (M USD) and boom cost 2019-202412.1.5 Europe ERP application sales (ok contraptions), revenue (M USD) and growth cost 2019-202412.1.6 South america ERP application income (k units), salary (M USD) and boom fee 2019-202412.1.7 core East and Africa ERP utility revenue (k devices), salary (M USD) and augment rate 2019-202412.2 revenue (k instruments), income (M USD) via kinds 2019-202412.2.1 ordinary Market Performance12.2.2 On-premise ERP sales (okay devices), earnings (M USD) and boom cost 2019-202412.2.3 Cloud ERP earnings (ok instruments), revenue (M USD) and augment fee 2019-202412.3 income through application 2019-202412.3.1 ordinary Market Performance12.3.2 Manufacture earnings and and augment cost 2019-202412.3.3 Logistics industry income and and growth expense 2019-202412.three.4 monetary earnings and and boom rate 2019-202412.3.5 Telecommunications revenue and and augment cost 2019-202412.4 rate (USD/Unit) and autochthonous Profit12.four.1 global ERP utility fee (USD/Unit) style 2019-202412.four.2 global ERP application autochthonous earnings style 2019-2024
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I’ve just completed IBM DB2 for Linux, Unix and Windows (LUW) coverage here on utilize The Index, Luke as preparation for an upcoming training I’m giving. This blog post describes the major differences I’ve create compared to the other databases I’m covering (Oracle, SQL Server, PostgreSQL and MySQL).
Free & Easy
Well, let’s face it: it’s IBM software. It has a pretty long history. You would probably not await that it is light to install and configure, but in fact: it is. At least DB2 LUW Express-C 10.5 (LUW is for Linux, Unix and Windows, Express-C is the free community edition). That might exist another surprise: there is a free community edition. It’s not open source, but it’s free as in free beer.
No light Explain
The first problem I stumbled upon is that DB2 has no light course to parade an execution plan. No kidding. Here is what IBM says about it:
Explain a statement by prefixing it with account for design for
This stores the execution design in a set of tables in the database (you’ll requisite to create these tables first). This is pretty much fancy in Oracle.
Display a stored account for design using db2exfmt
This is a command line tool, not something you can plunge from an SQL prompt. To Run this utensil you’ll requisite shell access to a DB2 installation (e.g. on the server). That means, that you cannot utilize this utensil over an regular database connection.
There is another command line utensil (db2expln) that combines the two steps from above. Apart from the fact that this procedure is not exactly convenient, the output you acquire an ASCII art:
Please note that this is just an excerpt—the complete output of db2exfmt has 400 lines. Quite a lot information that you’ll hardly ever need. Even the information that you requisite bar nobody the time (the operations) is presented in a pretty unreadable course (IMHO). I’m particularly thankful that bar nobody the numbers you observe above are not labeled—that’s really the icing that renders this “tool” totally useless for the occasional user.
However, according to the IBM documentation there is another course to parade an execution plan: “Write your own queries against the account for tables.” And that’s exactly what I did: I wrote a view called last_explained that does exactly what it’s designation suggest: it shows the execution design of the terminal statement that was explained (in a non-useless formatting):
ID | Operation | Rows | Cost
1 | revert | | 60528
2 | HSJOIN | 49535 of 10000 | 60528
3 | TBSCAN SALES | 49535 of 1009326 ( 4.91%) | 59833
4 | TBSCAN EMPLOYEES | 10000 of 10000 (100.00%) | 687
2 - combine (Q2.SUBSIDIARY_ID = DECIMAL(Q1.SUBSIDIARY_ID, 10, 0))
combine (Q2.EMPLOYEE_ID = DECIMAL(Q1.EMPLOYEE_ID, 10, 0))
3 - SARG ((CURRENT DATE - 6 MONTHS) < Q2.SALE_DATE)
Explain design by Markus Winand - NO WARRANTY
I’m pretty sure many DB2 users will scream that this presentation of the execution design is confusing. And that’s OK. If you are used to the course IBM presents execution plans, just stick to what you are used to. However, I’m working with bar nobody kinds of databases and they bar nobody fill a course to parade the execution design similar to the one shown above—for me this format is much more useful. Further, I’ve made a useful selection of data to display: the row import estimates and the predicate information.
You can acquire the source of the last_explained view from here or from GitHub (direct download). I’m staid about the no warranty part. Yet I’d fancy to know about problems you fill with the view.
Emulating Partial Indexes is Possible
Partial indexes are indexes not containing bar nobody table rows. They are useful in three cases:
To preserve space when the index is only useful for a very tiny fraction of the rows. Example: queue tables.
To establish a specific row order in presence of constant non-equality predicates. Example: WHERE x IN (1, 5, 9) ORDER BY y. An index fancy the following can exist used to avoid a sort operation:
CREATE INDEX … ON … (y)
WHERE x IN (1, 5, 9)
To implement unique constraints on a subset of rows (e.g. only those WHERE active = 'Y').
However, DB2 doesn’t champion a where clause for indexes fancy shown above. But DB2 has many Oracle-compatibility features, one of them is EXCLUDE NULL KEYS: “Specifies that an index entry is not created when bar nobody parts of the index key contain the null value.” This is actually the hard-wired behaviour in the Oracle database and it is commonly exploited to emulate partial indexes in the Oracle database.
Generally speaking, emulating partial indexes works by mapping bar nobody parts of the key (all indexed columns) to NULL for rows that should not discontinue up in the index. As an example, let’s emulate this partial index in the Oracle database (DB2 is next):
CREATE INDEX messages_todo
ON messages (receiver)
WHERE processed = 'N'
The solution presented in SQL Performance Explained uses a role to map the processed rows to NULL, otherwise the receiver value is passed through:
CREATE OR REPLACE
FUNCTION pi_processed(processed CHAR, receiver NUMBER)
IF processed IN ('N') THEN
It’s a deterministic role and can thus exist used in an Oracle function-based index. This won’t work with DB2, because DB2 doesn’t allow user defined-functions in index definitions. However, let’s first complete the Oracle example.
CREATE INDEX messages_todo
ON messages (pi_processed(processed, receiver));
This index has only rows WHERE processed IN ('N')—otherwise the role returns NULL which is not establish in the index (there is no other column that could exist non-NULL). Voilà: a partial index in the Oracle database.
To utilize this index, just utilize the pi_processed role in the where clause:
WHERE pi_processed(processed, receiver) = ?
This is functionally equivalent to:
WHERE processed = 'N'
AND receiver = ?
So far, so ugly. If you proceed for this approach, you’d better requisite the partial index desperately.
To Make this approach work in DB2 they requisite two components: (1) the EXCLUDE NULL KEYS clause (no-brainer); (2) a course to map processed rows to NULL without using a user-defined role so it can exist used in a DB2 index.
Although the second one might appear to exist hard, it is actually very simple: DB2 can execute expression based indexing, just not on user-defined functions. The mapping they requisite can exist accomplished with regular SQL expressions:
CASE WHEN processed = 'N' THEN receiver
This implements the very same mapping as the pi_processed role above. recollect that CASE expressions are first class citizens in SQL—they can exist used in DB2 index definitions (on LUW just since 10.5):
CREATE INDEX messages_not_processed_pi
ON messages (CASE WHEN processed = 'N' THEN receiver
EXCLUDE NULL KEYS;
This index uses the CASE expression to map not to exist indexed rows to NULL and the EXCLUDE NULL KEYS feature to forestall those row from being stored in the index. Voilà: a partial index in DB2 LUW 10.5.
To utilize the index, just utilize the CASE expression in the where clause and check the execution plan:
WHERE (CASE WHEN processed = 'N' THEN receiver
END) = ?;
ID | Operation | Rows | Cost
1 | revert | | 49686
2 | TBSCAN MESSAGES | 900 of 999999 ( .09%) | 49686
2 - SARG (Q1.PROCESSED = 'N')
SARG (Q1.RECEIVER = ?)
Oh, that’s a vast disappointment: the optimizer didn’t rob the index. It does a complete table scan instead. What’s wrong?
If you fill a very nearby peep at the execution design above, which I created with my last_explained view, you might observe something suspicious.
Look at the predicate information. What happened to the CASE expression that they used in the query? The DB2 optimizer was smart enough rewrite the expression as WHERE processed = 'N' AND receiver = ?. Isn’t that great? Absolutely!…except that this smartness has just ruined my attempt to utilize the partial index. That’s what I meant when I said that CASE expressions are first class citizens in SQL: the database has a pretty advantageous understanding what they execute and can transform them.
We requisite a course to apply their magic NULL-mapping but they can’t utilize functions (can’t exist indexed) nor can they utilize CASE expressions, because they are optimized away. Dead-end? Au contraire: it’s pretty light to sling an optimizer. bar nobody you requisite to execute is to obfuscate the CASE expression so that the optimizer doesn’t transform it anymore. Adding zero to a numeric column is always my first attempt in such cases:
CASE WHEN processed = 'N' THEN receiver + 0
The CASE expression is essentially the same, I’ve just added zero to the RECEIVER column, which is numeric. If I utilize this expression in the index and the query, I acquire this execution plan:
ID | Operation | Rows | Cost
1 | revert | | 13071
2 | FETCH MESSAGES | 40000 of 40000 | 13071
3 | RIDSCN | 40000 of 40000 | 1665
4 | SORT (UNQIUE) | 40000 of 40000 | 1665
5 | IXSCAN MESSAGES_NOT_PROCESSED_PI | 40000 of 999999 | 1646
2 - SARG ( CASE WHEN (Q1.PROCESSED = 'N') THEN (Q1.RECEIVER + 0)
ELSE NULL discontinue = ?)
5 - START ( CASE WHEN (Q1.PROCESSED = 'N') THEN (Q1.RECEIVER + 0)
ELSE NULL discontinue = ?)
discontinue ( CASE WHEN (Q1.PROCESSED = 'N') THEN (Q1.RECEIVER + 0)
ELSE NULL discontinue = ?)
The partial index is used as intended. The CASE expression appears unchanged in the predicate information section.
I haven’t checked any other ways to emulate partial indexes in DB2 (e.g., using partitions fancy in more recent Oracle versions).
As always: just because you can execute something doesn’t handle you should. This approach is so ugly—even more unpleasant than the Oracle workaround—that you must desperately requisite a partial index to justify this maintenance nightmare. Further it will discontinue working whenever the optimizer becomes smart enough to optimize +0 away. However, then you just requisite establish an even more unpleasant obfuscation in there.
INCLUDE Clause Only for Unique Indexes
With the comprehend clause you can add extra columns to an index for the sole purpose to allow in index-only scan when these columns are selected. I knew the comprehend clause before because SQL Server offers it too, but there are some differences:
In SQL Server comprehend columns are only added to the leaf nodes of the index—not in the root and branch nodes. This limits the repercussion on the B-tree’s depth when adding many or long columns to an index. This furthermore allows to bypass some limitations (number of columns, total index row length, allowed data types). That doesn’t appear to exist the case in DB2.
In DB2 the comprehend clause is only valid for unique indexes. It allows you to enforce the uniqueness of the key columns only—the comprehend columns are just not considered when checking for uniqueness. This is the same in SQL Server except that SQL Server supports comprehend columns on non-unique indexes too (to leverage the above-mentioned benefits).
Almost No NULLS FIRST/LAST Support
The NULLS FIRST and NULLS terminal modifiers to the order by clause allow you to specify whether NULL values are considered as larger or smaller than non-NULL values during sorting. Strictly speaking, you must always specify the desired order when sorting nullable columns because the SQL gauge doesn’t specify a default. As you can observe in the following chart, the default order of NULL is indeed different across various databases:
Figure A.1. Database/Feature Matrix
In this chart, you can furthermore observe that DB2 doesn’t champion NULLS FIRST or NULLS LAST—neither in the order by clause no in the index definition. However, note that this is a simplified statement. In fact, DB2 accepts NULLS FIRST and NULLS terminal when it is in line with the default NULLS order. In other words, ORDER BY col ASC NULLS FIRST is valid, but it doesn’t change the result—NULLS FIRST is anyways the default. same is loyal for ORDER BY col DESC NULLS LAST—accepted, but doesn’t change anything. The other two combinations are not valid at bar nobody and relent a syntax error.
SQL:2008 FETCH FIRST but not OFFSET
DB2 supports the fetch first … rows only clause for a while now—kind-of impressive considering it was “just” added with the SQL:2008 standard. However, DB2 doesn’t champion the offset clause, which was introduced with the very same release of the SQL standard. Although it might peep fancy an capricious omission, it is in fact a very judicious jog that I deeply respect. offset is the root of so much evil. In the next section, I’ll account for how to live without offset.
Side node: If you fill code using offset that you cannot change, you can soundless activate the MySQL compatibility vector that makes circumscribe and offset available in DB2. amusing enough, combining fetch first with offset is then soundless not practicable (that would exist gauge compliant).
Decent Row-Value Predicates Support
SQL row-values are multiple scalar values grouped together by braces to form a sole logical value. IN-lists are a common use-case:
WHERE (col_a, col_b) IN (SELECT col_a, col_b FROM…)
This is supported by pretty much every database. However, there is a second, hardly known use-case that has pretty destitute champion in today’s SQL databases: key-set pagination or offset-less pagination. Keyset pagination uses a where clause that basically says “I’ve seen everything up till here, just give me the next rows”. In the simplest case it looks fancy this:
WHERE time_stamp < ?
ORDER BY time_stamp DESC
FETCH FIRST 10 ROWS ONLY
Imagine you’ve already fetched a bunch of rows and requisite to acquire the next few ones. For that you’d utilize the time_stamp value of the terminal entry you’ve got for the bind value (?). The query then just revert the rows from there on. But what if there are two rows with the very same time_stamp value? Then you requisite a tiebreaker: a second column—preferably a unique column—in the order by and where clauses that unambiguously marks the residence till where you fill the result. This is where row-value predicates near in:
WHERE (time_stamp, id) < (?, ?)
ORDER BY time_stamp DESC, id DESC
FETCH FIRST 10 ROWS ONLY
The order by clause is extended to Make sure there is a well-defined order if there are equal time_stamp values. The where clause just selects what’s after the row specified by the time_stamp and id pair. It couldn’t exist any simpler to express this selection criteria. Unfortunately, neither the Oracle database nor SQLite or SQL Server understand this syntax—even though it’s in the SQL gauge since 1992! However, it is practicable to apply the same logic without row-value predicates—but that’s rather inconvenient and light to acquire wrong.
Even if a database understands the row-value predicate, it’s not necessarily understanding these predicates advantageous enough to Make proper utilize of indexes that champion the order by clause. This is where MySQL fails—although it applies the logic correctly and delivers the perquisite result, it does not utilize an index for that and is thus rather slow. In the end, DB2 LUW (since 10.1) and PostgreSQL (since 8.4) are the only two databases that champion row-value predicates in the course it should be.
The fact that DB2 LUW has everything you requisite for convenient keyset pagination is furthermore the intuition why there is absolutely no intuition to complain about the missing offset functionality. In fact I arbitrator that offset should not fill been added to the SQL gauge and I’m tickled to observe a vendor that resisted the prick to add it because its became portion of the standard. Sometimes the gauge is wrong—just sometimes, not very often ;) I can’t change the standard—all I can execute is teaching how to execute it perquisite and start campaigns fancy #NoOffset.
Figure A.2. Database/Feature Matrix
If you fancy my course of explaining things, you’ll fancy my engage “SQL Performance Explained”.
Chances are, you fill never heard of Amanda… in the sense of open source that is. And if you fill not heard of Amanda, then chances are you fill not heard of Zmanda either. I will account for both, and I will give you my view of why it is notable for you to at least exist sensible of these products and their relation to data protection. Whether you should invest in either depends on many factors that will become limpid shortly.
Let's start with Amanda. Amanda is the most celebrated open source data protection product in the market today, at least based on the number of free downloads: 250,000 or more. fancy most free downloads, these usually near from universities -- both students and IT folks -- and scientific labs. But, they furthermore comprehend individuals from corporations that are experimenting with open source. In a nutshell, Amanda is a client/server data protection software that runs on a Linux server (backup server) and protects clients that Run Windows, Linux or Unix (only a few variants at the moment). It was developed originally at the University of Maryland and then dropped into the world of open source. Since it was distributed to the open source community, hundreds of programmers fill contributed to its development, bug fixes and its universal custody and feeding. As a result, the usage of the product has continued to climb dramatically over the past few years.
You can utilize Amanda for free. You can modify it and establish it back in the ether for free. But, fancy bar nobody open source software, if the software just stopped running in the middle of the night because your client application server was not yet supported, advantageous luck trying to acquire support. Or anything else. Your best pot would exist to residence your request on one of many Web sites where users and developers encourage each other out.
But, unlike Linux operating systems (where there are companies fancy RedHat and SUSE, which is now Novell) or Linux-based databases (where there are companies fancy mySQL), Amanda did not fill a "for profit" sponsor until recently. In late 2005, a newly-formed company was charged with working to Make Amanda a more usable product that would exist able to champion enterprises of bar nobody sizes. In keeping with the open source model, Zmanda has grabbed leadership of this space and is feverishly encouraging additional programmers -- some internal to the company, but most belonging to other companies/organizations -- to enhance Amanda so it can effectively compete with Symantec NetBackup, EMC Networker, CommVault Galaxy, Tivoli and others that plunge in the enterprise-class data protection software category. Even within the terminal six months, Amanda has near a long way. But, it furthermore has a long course to proceed before I would reckon it a complete member of this class. Should you therefore ignore it? No. However, the intuition I am writing this column is to Make you sensible that, under the perquisite set of circumstances, Amanda is worth considering.
Enter Zmanda. The company has released a specific version of Amanda (two versions, actually) that they champion under the classic open source subscription model. You pay only for subscription and champion and not for the product itself, just fancy any other open source product. Of course, the entire concept is to cost it such that the total cost of ownership is significantly (as in one-half to one-fourth the cost) lower than other commercial products.
But before you jump into the fray, question yourself the following questions:
Does the current product fill champion for my systems?
Does it fill the features I need?
Does the product fill champion for my applications (e.g., Oracle, SQLserver, and DB2?)
Does it fill adequate disk support?
What about archiving?
I am sure that as you peep into these options you will fill other questions that are specific to your organization's needs. Version 2.50 of Zmanda does fill champion for Windows and Linux, but not for bar nobody celebrated flavors of Unix. It should champion databases and other applications in the future but does not perquisite now. It furthermore lacks a GUI and does not yet champion bar nobody the fresh innovations that they fill seen in the world of disk champion (like VTL and CDP). But, it does fill disk support. It furthermore has some features that I wish they had in the other commercial offerings, fancy a non-proprietary data format and fancy having the faculty to execute a recovery without requiring the vendor's software. Of course, its Linux champion is excellent.
In my view, true innovation occurs when there is a monetary incentive and there is a discontinuity in the technology curve. That is why they fill seen the massive transformation in data protection software in the past five years. SATA was the technology that opened up opportunities that just were not available before. But, before that, one could Make a pretty reasonable controversy that data protection software from bar nobody the major vendors had become pretty bloated, and the rate of innovation was very slow. Adding champion for a fresh tape library does not import as innovation in my book. It is precisely at such times, when differentiation between vendors' products is low, that open source starts to Make a lot of sense. Thousands of programmers start developing and creating a simpler, less cumbersome product with adequate functionality for many companies that don't requisite it all. Also, they are cost-sensitive and fancy the freedom.
That is how mySQL and, of course, Linux itself got going. Now it is Zmanda. But unlike the other segments, data protection is now experiencing phenomenal innovation. So, Amanda's (and therefore, Zmanda's) challenge will exist to not only create the dilapidated tape-based functionality but furthermore to add bar nobody the fresh juicy disk-based functionality that is coming in waves currently. I suspect it is up for the challenge but at least exist sensible that there could exist a lag before you observe bar nobody of these features.
It was bound to happen. If database, J2EE, server virtualization and security tools got an open source counterpart, how far behind could data protection be? If you fill simpler needs, cost is a major issue and you crave that freedom from the vast vendor -- for whatever intuition -- then you should check out this fresh space. But my advice: execute not Run a production environment without the champion that comes with Zmanda. Amanda may exist free, but she can exist pains without the support.
About the author: Arun Taneja is the founder and consulting analyst for the Taneja Group. Taneja writes columns and answers questions about data management and related topics.
Advances in mobility, cloud, vast Data, DevOps and digital delivery, plus the shift to more rapid release cycles of software and services, are enabling businesses to become more agile. IT workforce research and analyst firm Foote Partners assesses the IT skills gap these trends are creating, their repercussion on salaries and where the demand for expertise is headed.
By David Foote
It's difficult to find an employer not struggling to near up with a unique tech staffing model that balances three things: the urgencies of fresh digital innovation strategies, combating ever deepening security threats, and keeping integrated systems and networks running smoothly and efficiently. The staffing challenge has moved well beyond simply having to pick between contingent workers, full-time tech professionals, and a variety of cloud computing and managed services options (Infrastructure as a Service [IaaS], Platform as a Service [PaaS], Software as a Server [SaaS]). Over the next few years, managers will continue to exist tasked with leading a massive transformation of the technology and tech-business hybrid workforce to focus on quickly and predictably delivering a wide variety of operational and revenue-generating infrastructure solutions involving Internet of Things (IoT) products and services, vast Data advanced analytics, cybersecurity, and fresh mobile and cloud computing capabilities. Consequently, tech professionals and developers must align their skills and interests accordingly to encourage their employers meet existing and forthcoming digital transformation imperatives that are forcing deep, accelerated changes in technology organizations.
As cloud infrastructure becomes more capable of economically delivering performance and data at capacities and speeds once never imagined, organizations of bar nobody sizes are seeking tech professionals and developers with the proper skills, knowledge, and competencies to create more agile and responsive environments.
At the same time, they're grappling to ensure reliability of existing infrastructure where any amount of downtime is less acceptable than ever. Along with that is an onslaught of cybersecurity attacks occurring more frequently that fill many IT managers adage they can't find adequate labor to encourage them protect their existing networks and endpoints. The latest reminder was in the spotlight following the most powerful denial of service (DoS) storm to date in late October resulting from unprotected endpoints on surveillance cameras. IoT, machine-to-machine communications and telematics fill introduced fresh complexities ranging from the requisite to better secure the devices and the delivery points to which they connect. Meanwhile, the growing IoT landscape is unleashing an exponential flood of fresh data from hundreds of millions of devices, and organizations requisite to blend their IT and operational systems and find people with vast Data analytics skills to wield the cloud-based machine learning infrastructure that's now emerging. This generational shift in IT will establish a premium on, or create a baseline requirement for, IT professionals willing to follow the money and observe where their skills will exist most applicable. Whether you're a manager looking to ensure your staff can deliver on these changes or an IT professional deciding on a career direction, workforce requirements and customer expectations are changing.
If you're in the latter camp, it's notable to understand that the supply-and-demand aspect that drives compensation is furthermore a piteous target. IT pay has a long history of volatility and in 2016 they fill seen even sharper swings in those premiums. Based on hiring patterns, the following overriding trends will drive market demand for IT professionals who fill the experience, drive and skills to deliver solutions:
Cybersecurity: The requisite to protect traditional infrastructure from pervasive and ongoing attacks from a growing number of vectors and sophistication. Evidence suggests pay premiums for cybersecurity will continue to exist stout for the coming years as the threat landscape continues to become more tangled and confounding. The elimination of traditional boundaries brought about by cloud computing and mobility and a massive fresh influx of data generated by IoT devices will only exacerbate this need. More than 25 percent of identified attacks will involve IoT, according to Gartner Inc.
Cloud: IT infrastructure over time is transitioning to an all-cloud model, whether provided by a services provider, in the datacenter or a hybrid mix of the two. The jog to these elastic infrastructures and op-ex approach to IT is furthermore enabling high-performance computing and storage capacity that's ushering in the faculty to accomplish workloads and software-defined automation not practicable with traditional client server or Web application tier infrastructures. Likewise, the jog to cloud service-based apps such as Salesforce, Office 365 and Workday, to designation just a few, is shifting the requisite for those with skills in building and managing traditional packaged software to those expert in these fresh SaaS-based solutions. The amount spent on cloud this year was forecast at $111 billion, according to Gartner. By 2020, that spending is expected to climb to $216 billion.
Big Data Analytics/Machine Learning: The jog toward digital transformation is bar nobody about empowering users to Make quick decisions based on an overwhelmingly massive groundswell of data to exist curated from fresh sources such as IoT endpoints using the cloud infrastructure and enabling predictive analytics utilizing the machine learning conversational computing frameworks that Amazon Web Services Inc. (AWS), Google Inc., IBM Corp. and Microsoft are developing.
DevOps: The drive to bring together IT operations and development is taking hold as the jog to digital transformation, or at least the design to execute so, means organizations must exist more agile. A more rapid release cadence in software delivery -- from Windows and Office to open source environments and vertical applications -- requires that IT shops can build, deliver and manage systems with these dynamics. Likewise, fresh programming environments and frameworks such as containers and micro-services are enabling fresh classes of cloud-native applications designed for fresh classes of devices and quick-witted and modern infrastructure.
Digital industry Transformation: This is the discontinue goal of many organizations that fear, rightfully so, their industry models are at risk unless they can become digital businesses. This is the culmination of the four areas just preeminent but furthermore includes the faculty to leverage advances in UX and UI design and the faculty to leverage IT to encourage companies build fresh products, services and champion that's tuned to the digital era.
Selected DevOps Skills & Certifications: Pay Premiums Performance
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AWS cloud tools and solutions
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