Oracle Database 11 g - Online Public Access Catalog

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82 CHAPTER 2 ■ DATABASE DIAGNOSABILITY AND FAILURE REPAIRBlock IO Revalidation CheckTxn Revalidation CheckFailure Simulation CheckDictionary Integrity CheckChecks file accessabilityRevalidate corrupted txnCreates dummy failuresChecks dictionary integrity21 rows selected.SQL>You can view the input parameters that you can specify for the health checks by using theV$CHECK_PARAM view.You can run the health checks in two modes—DB-online (database in the open or mountstate) and DB-offline (database in the nomount mode, with just the instance up). You can performmost Health Monitor checks even when the database is offline. The column offline_ capablein the V$HM_CHECK view shows whether you can perform an offline check for a particulartype of checkAs mentioned earlier, although the database is capable of detecting failures by the automaticexecution of checkers, that process is set off only when the database encounters a problemsuch as corrupted data. By running various checks manually, you can catch failures before theycause extensive damage. We’ll discuss manual checks in the following section.Manual ChecksAlthough the database automatically performs reactive checks, it’s a good idea to proactivelyrun the checkers on a regular basis to detect potential failures that haven’t affected the databaseyet. Reactive checks are run only when a failure affects the database, say, when a user triesto retrieve data from a corrupted data block. However, a corrupted data block won’t automaticallycause a failure alert to be lodged in the database if users haven’t accessed that block afterit was corrupted. Manual checks help catch such hidden failures that may strike during thecourse of a busy day and potentially hinder the availability of the database.You can perform manual database checks by using <strong>Database</strong> Control or by using theDBMS_HM PL/SQL package. In addition, you can also perform database corruption checks usingthe new RMAN validate command. We’ll first look at how to run checks using the DBMS_HMpackage.Manual Checking Using the DBMS_HM PackageAs mentioned earlier, <strong>Oracle</strong> makes the Health Monitor functionality available through theDBMS_HM package. Use the run_check procedure of the DBMS_HM package to run a proactive healthcheck. Here is the structure of the run_check procedure:PROCEDURE RUN_CHECKArgument Name Type In/Out Default?---------------------- ------------ ---------- ---------L_CHECKNAME VARCHAR2 INL_RUNNAME VARCHAR2 IN DEFAULTL_TIMEOUT NUMBER IN DEFAULTL_PARAMS VARCHAR2 IN DEFAULT
CHAPTER 2 ■ DATABASE DIAGNOSABILITY AND FAILURE REPAIR 83Here’s what the different arguments of the run_check procedure stand for:• CHECKNAME: Name of the database check. This is a mandatory argument and must exactlymatch a check name from the V$HM_CHECK view.• RUNNAME: This is an optional argument that lets you specify a name for the check run.• TIMEOUT: Optionally, you can set a limit on the length of time a check can run.• PARAMS: This is an input parameter that controls the execution of the check. You can viewthe various types of inputs by querying the V$HM_CHECK_PARM view.In the following example, we show you how to perform a database crosscheck, which teststhe integrity of all datafiles in the database. Just pass the type of check and a name for the testrun to the run_check procedure, as shown here:SQL> exec dbms_hm.run_check('DB Structure IntegrityCheck','testrun1');PL/SQL procedure successfully completed.SQL>The Health Monitor saves the report of all its database checks in the ADR home of thisdatabase instance. The show hm_run command shows a summary of all checker executions thatare registered in the ADR. These are the same checker runs that will be visible from the V$HM_RUNview. Here are sample results of the show hm_run command:adrci> show hm_run**********************************************************************HM RUN RECORD 19RUN_ID 342RUN_NAMEtestrun1CHECK_NAMEData Block Integrity CheckNAME_ID 3MODE 0START_TIME 2007-07-22 17:50:17.845880 -04:00RESUME_TIMEEND_TIME 2007-07-22 17:50:17.886126 -04:00MODIFIED_TIME 2007-07-22 17:50:17.886126 -04:00TIMEOUT 0FLAGS 0STATUS 6SRC_INCIDENT_ID 0NUM_INCIDENTS 0ERR_NUMBER 48615REPORT_FILE...19 rows fetchedadrci>
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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■CONTENTSxvImprovements in Redo T
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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xxvi■INTRODUCTION• The easy add
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226 CHAPTER 5 ■ DATABASE SECURITY
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266 CHAPTER 6 ■ BACKUP AND RECOVE
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CHAPTER 7■ ■ ■Data PumpDBAs a
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CHAPTER 7 ■ DATA PUMP 315if test
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CHAPTER 7 ■ DATA PUMP 317DBA11g1
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CHAPTER 7 ■ DATA PUMP 319Encrypti
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CHAPTER 7 ■ DATA PUMP 321Please b
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CHAPTER 7 ■ DATA PUMP 323Remappin
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CHAPTER 7 ■ DATA PUMP 325SELECT d
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CHAPTER 7 ■ DATA PUMP 327Document
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CHAPTER 7 ■ DATA PUMP 331SQL> sel
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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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CHAPTER 9■ ■ ■Storage Managem
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CHAPTER 9 ■ STORAGE MANAGEMENT 36
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416 CHAPTER 10 ■ DATA GUARD• Lo
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418 CHAPTER 10 ■ DATA GUARDsql ch
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440 CHAPTER 10 ■ DATA GUARDCustom
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442 CHAPTER 10 ■ DATA GUARDselect
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446 CHAPTER 11 ■ APPLICATION DEVE
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CHAPTER 12■ ■ ■Data Warehousi
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CHAPTER 12 ■ DATA WAREHOUSING 517
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566 ■INDEXadvise failure command,
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568 ■INDEXDBMS_ADDM package, 216-
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576 ■INDEXDBMS-WORKLOAD_REPOSITOR
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586 ■INDEXOCISessionGet( ) method
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592 ■INDEXreader farm, 421read-on
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600 ■INDEXOracle Audit Vault, 259
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