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This is an excerpt from Chapter 15 of the engage "OCA Oracle Database 11g: Administration I Exam Guide" by John Watson, copyright 2008 from Oracle Press, a division of McGraw-Hill. Click here to download the full chapter.
Perhaps the most vital aspect of a database administrator's job is to ensure that the database does not lose data. The mechanisms of redo and undo ensure that it is impossible to vitiate the database no matter what the DBA does, or does not, execute (always assuming that there is no physical damage). After working through the section of this chapter headed Instance Recovery, you will exist able to prove this. However, it is possible for an Oracle database to lose data if the DBA does not remove appropriate precautions.
From release 9i onward, an Oracle database can exist configured so that no matter what happens, the database will never lose a separate row of committed data. It is too possible to configure an environment for one hundred percent availability. This exemplar configuration requires expend of Data Guard and RAC (or possibly Streams). A single-instance, non-distributed environment cannot achieve this—but it can net very close.
This chapter will fade through the concepts behind Oracle's backup and recovery mechanisms: the enabling structure within which you will configure whatever level of data security and availability is demanded by your organization. The next two chapters will cover the practicalities of backup, restore, and recovery. But always exist vigilant that this is a superficial treatment; the second OCP examination deals with backup and recovery in much greater detail. And even after passing that, you will not necessarily exist fully competent. This is an region where you cannot execute enough studying, research, and (most importantly) practice.
Identify the Types of Failure That Can Occur in an Oracle Database:
An individual SQL statement can fail for a number of reasons, not complete of which are within the DBA's domain—but even so, he/she must exist prepared to fix them. The first level of fixing will exist automatic. Whenever a statement fails, the server process executing the statement will detect the problem and roll back the statement. bethink that a statement might attempt to update many rows, and fail Part passage through execution; complete the rows that were updated before the failure will maintain their changes reversed through expend of undo. This will happen automatically. If the statement is Part of a multistatement transaction, complete the statements that maintain already succeeded will remain intact, but uncommitted. Ideally, the programmers will maintain included exceptions clauses in their code that will identify and manage any problems, but there will always exist some errors that net through the mistake handling routines.
A common cause of statement failure is invalid data, usually a format or constraint violation. A well-written user process will avoid format problems, such as attempting to insert character data into a numeric field, but they can often occur when doing batch jobs with data coming from a third-party system. Oracle itself will try to decipher formatting problems by doing automatic typecasting to transmute data types on the fly, but this is not very efficient and shouldn't exist replied upon. Constraint violations will exist detected, but Oracle can execute nothing to decipher them. Clearly, problems caused by invalid data are not the DBA's fault, but you must exist prepared to deal with them by working with the users to validate and rectify the data, and with the programmers to try to automate these processes.
A second class of non-DBA-related statement failure is logic errors in the application. Programmers may well develop code that in some circumstances is impossible for the database to execute. A faultless case is the deadlock described in Chapter 10: the code will run perfectly, until through nefarious luck two sessions happen to try execute the selfsame thing at the selfsame time to the selfsame rows. A deadlock is not a database error; it is an mistake caused by programmers writing code that permits an impossible situation to arise.
Space management problems are frequent, but they should never occur. A profitable DBA will monitor space usage proactively and remove action before problems arise. Space-related causes of statement failure embrace inability to extend a segment because the tablespace is full, running out of undo space, insufficient temporary space when running queries that expend disk sorts or working with temporary tables, a user hitting his/her quota limit, or an protest hitting its maximum extents limit. Database Control includes the undo advisor, the segment advisor, the Automatic Database Diagnostic Monitor, and the alert mechanism, complete described in previous chapters, which will inspirit to pick up space-related problems before they happen. The sequel of space problems that slip through can perhaps exist alleviated by setting datafiles to autoextend, or by enabling resumable space allocation, but ideally space problems should never arise in the first place.
Statements may fail because of insufficient privileges. bethink from Chapter 8 how privileges let a user execute unavoidable things, such as select from a table or execute a piece of code. When a statement is parsed, the server process checks whether the user executing the statement has the necessary permissions. This type of mistake indicates that the security structures in region are inappropriate, and the DBA (in conjunction with the organization's security manager) should vouchsafe appropriate system and protest privileges.
Figure 15-1 shows some examples of statement failure: a data error, a permissions error, a space error, and a logic error.
FIGURE 15.1: Examples of statement failures
Read about the other types of failure categories and continue reading this chapter by downloading a free .pdf of Backup and Recovery Concepts from OCA Oracle Database 11g: Administration I Exam Guide.
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Understanding Business By William G Nickels, James McHugh, Susan McHugh Publisher : McGraw-Hill (Feb 2018) ISBN10 : 126021110X ISBN13 : 9781260211108 Our ISBN10 : 126009233X Our ISBN13 : 9781260092332 Subject : Business & Economics
Understanding Business By William Nickels, James McHugh, Susan McHugh Publisher : McGraw-Hill (May 2018) ISBN10 : 1260682137 ISBN13 : 9781260682137 Our ISBN10 : 126009233X Our ISBN13 : 9781260092332 Subject : Business & Economics
Understanding Business By William Nickels, James McHugh, Susan McHugh Publisher : McGraw-Hill (Jan 2018) ISBN10 : 1260277143 ISBN13 : 9781260277142 Our ISBN10 : 126009233X Our ISBN13 : 9781260092332 Subject : Business & Economics
Understanding Business By William Nickels, James McHugh, Susan McHugh Publisher : McGraw-Hill (Jan 2018) ISBN10 : 1259929434 ISBN13 : 9781259929434 Our ISBN10 : 126009233X Our ISBN13 : 9781260092332 Subject : Business & Economics
1Z0-034 By Peter W. Cardon Publisher : McGraw-Hill (Jan 2017) ISBN10 : 1260128474 ISBN13 : 9781260128475 Our ISBN10 : 1259921883 Our ISBN13 : 9781259921889 Subject : Business & Economics, Communication & Media
1Z0-034 By Peter Cardon Publisher : McGraw-Hill (Feb 2017) ISBN10 : 1260147150 ISBN13 : 9781260147155 Our ISBN10 : 1259921883 Our ISBN13 : 9781259921889 Subject : Business & Economics, Communication & Media