Oracle Database 11 g - Online Public Access Catalog

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180 CHAPTER 4 ■ PERFORMANCE MANAGEMENTSQL> select status,name,namespacefrom v$result_cache_objects wherecache_id='4t7p9c4m3xty05wpjas75taw9j';STATUS NAME NAMESPACE---------- ----------------------------------------------------- ---------Published select /*+ result_cache +*/ department_id,avg(salary) SQLSQL>The STATUS column’s value (Published) in the V$RESULT_CACHE_OBJECTS view revealsthat the result for this query is available for use. The other possible values for the STATUS column arenew (result under construction), bypass, expired, and invalid. The NAMESPACE column showsthat this is a SQL statement. The other value for the NAMESPACE column is PLSQL.Examples of Query Result CachingWe’ll use a simple example to show how the SQL query result cache feature works. First specifyresult caching for your query using the result_cache hint. Before you create the newly cachedSQL query, flush the server result cache as well as the shared pool so you start fresh with thenew query whose results you want to store in the server result cache.SQL> exec dbms_result_cache.flushPL/SQL procedure successfully completed.SQL> alter system flush shared_pool;System altered.SQL>The DBMS_RESULT.CACHE_FLUSH procedure purges the server result cache. In this example,we used a simple invocation of the flush procedure, but you can also specify that the databaseretain the free memory in the cache as well as the existing cache statistics. Alternately, insteadof flushing the entire contents of the server result cache, you can execute the invalidate procedureinstead to specify only those results that depend on a specified database object or areowned by a specific user. You most likely are familiar with the alter system flush shared_poolstatement, which flushes the shared pool, so you have no prior executions of the test SQLqueries in the shared pool already.Here’s the test SQL query, with the result_cache hint:SQL> select /*+ result_cache q_name(Query1) */last_name,salaryfrom emporder by salary;
CHAPTER 4 ■ PERFORMANCE MANAGEMENT 181Note that we provided the optional q_name parameter within the result_cache hint tospecify a name (Query1) for our new SQL query whose results the database will store in theserver result cache. If you check the execution plan for the new SQL query, you’ll see that thequery uses the result_cache optimizer hint:SQL> explain plan forselect /*+ result_cache q_name(Query1) */last_name,salaryfrom hr.employeesorder by salary;Explained.SQL> @$ORACLE_HOME/rdbms/admin/utlxplsPLAN_TABLE_OUTPUT--------------------------------------------------------------------------------Plan hash value: 3447538987--------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost(%CPU)| Time |PLAN_TABLE_OUTPUT-----------------------------------------------------------------------| 0 | SELECT STATEMENT | | 107 | 1284 | 4 (25)| 00:00:01 || 1 | RESULT CACHE | 6xt7gzhawg9jg8m503j2njzdxm | | || || 2 | SORT ORDER BY | | 107 | 1284 | 4 (25)| 00:00:01 || 3 | TABLE ACCESS FULL| EMPLOYEES | 107 | 1284 | 3 (0)| 00:00:01 |PLAN_TABLE_OUTPUT--------------------------------------------------------------------------------Result Cache Information (identified by operation id):------------------------------------------------------1 - column-count=2; dependencies=(HR.EMPLOYEES);name="select /*+ result_cache q_name(Q1) */last_name,salary
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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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xxviii■INTRODUCTION• The flashb
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2 CHAPTER 1 ■ INSTALLING, UPGRADI
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10 CHAPTER 1 ■ INSTALLING, UPGRAD
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58 CHAPTER 2 ■ DATABASE DIAGNOSAB
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100 CHAPTER 3 ■ DATABASE ADMINIST
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230 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 329SQL> sel
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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 7 ■ DATA PUMP 335If you a
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338 CHAPTER 8 ■ ORACLE STREAMSLat
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340 CHAPTER 8 ■ ORACLE STREAMSA s
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342 CHAPTER 8 ■ ORACLE STREAMSSQL
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344 CHAPTER 8 ■ ORACLE STREAMSThe
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346 CHAPTER 8 ■ ORACLE STREAMSStr
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348 CHAPTER 8 ■ ORACLE STREAMSDBM
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350 CHAPTER 8 ■ ORACLE STREAMSPle
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352 CHAPTER 8 ■ ORACLE STREAMSa p
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354 CHAPTER 8 ■ ORACLE STREAMSSpl
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356 CHAPTER 8 ■ ORACLE STREAMSpro
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358 CHAPTER 8 ■ ORACLE STREAMSSup
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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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420 CHAPTER 10 ■ DATA GUARDDBA11g
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422 CHAPTER 10 ■ DATA GUARDWhile
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424 CHAPTER 10 ■ DATA GUARDSQL> c
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426 CHAPTER 10 ■ DATA GUARDSQL> a
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428 CHAPTER 10 ■ DATA GUARD7. Swi
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430 CHAPTER 10 ■ DATA GUARDwho ha
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432 CHAPTER 10 ■ DATA GUARDSQL> s
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434 CHAPTER 10 ■ DATA GUARDDynami
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436 CHAPTER 10 ■ DATA GUARDSQL> B
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438 CHAPTER 10 ■ DATA GUARDcomman
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440 CHAPTER 10 ■ DATA GUARDCustom
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442 CHAPTER 10 ■ DATA GUARDselect
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444 CHAPTER 10 ■ DATA GUARDby Dat
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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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570 ■INDEXcdump diagnostic direct
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572 ■INDEXcursor_sharing paramete
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574 ■INDEXdb_file_name_convert 's
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576 ■INDEXDBMS-WORKLOAD_REPOSITOR
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578 ■INDEXencrypt keyword, 243ENC
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580 ■INDEXdefined, 112-114enablin
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582 ■INDEXinsert command, 114, 56
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584 ■INDEXmanually loaded plans,
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586 ■INDEXOCISessionGet( ) method
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588 ■INDEXusability improvements,
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590 ■INDEXpga_aggregate_target in
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592 ■INDEXreader farm, 421read-on
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594 ■INDEXrestoring backup contro
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596 ■INDEXserver_file_system opti
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598 ■INDEXsynchronous capture, 33
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600 ■INDEXOracle Audit Vault, 259
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602 ■INDEXxmldiff command-line ut
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Oracle Database 11 g - Online Public Access Catalog

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