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Oracle 查看 Shared Pool 信息的相关脚本

2011-09-28 10:07 761 查看

关于OracleSGA中SharedPool的详细说明，参考我的blog：

Oracle
Sharedpool详解

/article/1673130.html

在上篇blog里，介绍了sharedpool的组成和一些原理，也有一些脚本，在这篇blog里，在补充几个查看SharedPool的脚本。

From：http://vsbabu.org/oracle/sect13.html

一.QuickCheck

/*
Formattedon2011/7/2110:41:56(QP5v5.163.1008.3004)*/

SELECT'YoumayneedtoincreasetheSHARED_POOL_RESERVED_SIZE'Description,

'RequestFailures='||REQUEST_FAILURESLogic

FROMv$shared_pool_reserved

WHEREREQUEST_FAILURES>0

AND0!=(SELECTTO_NUMBER(VALUE)

FROMv$parameter

WHERENAME='shared_pool_reserved_size')

UNION

SELECT'YoumaybeabletodecreasetheSHARED_POOL_RESERVED_SIZE'

Description,

'RequestFailures='||REQUEST_FAILURESLogic

FROMv$shared_pool_reserved

WHEREREQUEST_FAILURES<5

AND0!=(SELECTTO_NUMBER(VALUE)

FROMv$parameter

WHERENAME='shared_pool_reserved_size')

二.MemoryUsage

SHAREDPOOLMEMORYUSAGENOTES:

（1）Owner-Owneroftheobject

（2）Object-Name/namespaceoftheobject

（3）SharableMemory-Amountofsharablememoryinthesharedpoolconsumedbytheobject

/*
Formattedon2011/7/2110:44:32(QP5v5.163.1008.3004)*/

SELECTOWNER,NAME||'-'||TYPEobject,SHARABLE_MEM

FROMv$db_object_cache

WHERESHARABLE_MEM>10000

ANDTYPEIN('PACKAGE','PACKAGEBODY','FUNCTION','PROCEDURE')

ORDERBYSHARABLE_MEMDESC

三.Loads

LOADSINTOSHAREDPOOLNOTES:

（1）Owner-Owneroftheobject

（2）Object-Name/namespaceoftheobject

（3）Loads-Numberoftimestheobjecthasbeenloaded.Thiscountalsoincreaseswhenanobjecthasbeeninvalidated.

/*
Formattedon2011/7/2110:45:24(QP5v5.163.1008.3004)*/

SELECTOWNER,NAME||'-'||TYPEobject,LOADS

FROMv$db_object_cache

WHERELOADS>3

ANDTYPEIN('PACKAGE','PACKAGEBODY','FUNCTION','PROCEDURE')

ORDERBYLOADSDESC

四.Executions

SHAREDPOOLEXECUTIONNOTES:

（1）Owner-Owneroftheobject

（2）Object-Name/namespaceoftheobject

（3）Executions-Totalnumberoftimesthisobjecthasbeenexecuted

/*
Formattedon2011/7/2110:46:15(QP5v5.163.1008.3004)*/

SELECTOWNER,NAME||'-'||TYPEobject,EXECUTIONS

FROMv$db_object_cache

WHEREEXECUTIONS>100

ANDTYPEIN('PACKAGE','PACKAGEBODY','FUNCTION','PROCEDURE')

ORDERBYEXECUTIONSDESC

五.Details

SHAREDPOOLDETAILNOTES:

（1）Owner-Owneroftheobject

（2）Name-Nameoftheobject

（3）DBLink-Databaselinkname,ifany

（4）Namespace-Namespaceoftheobject

（5）Type-Typeoftheobject

（6）SharableMemory-Amountofsharablememoryinthesharedpoolconsumedbytheobject

（7）Loads-Numberoftimestheobjecthasbeenloaded.Thiscountalsoincreaseswhenanobjecthasbeeninvalidated.

（8）Executions-Totalnumberoftimesthisobjecthasbeenexecuted

（9）Locks-Numberofuserscurrentlylockingthisobject

（10）Pins-Numberofuserscurrentlypinningthisobject

/*
Formattedon2011/7/2110:48:52(QP5v5.163.1008.3004)*/

SELECTOWNER,

NAME,

DB_LINK,

NAMESPACE,

TYPE,

SHARABLE_MEM,

LOADS,

EXECUTIONS,

LOCKS,

PINS

FROMv$db_object_cache

ORDERBYOWNER,NAME

六.LibraryCacheStatistics

SHAREDPOOLV$LIBRARYCACHESTATISTICNOTES:

（1）Namespace-Librarycachenamespace(SQLAREA,TABLE/PROCEDURE,BODY,TRIGGER,INDEX,CLUSTER,OBJECT,PIPE)

（2）Gets-Numberoftimesthesystemrequestshandlestolibraryobjectsbelongingtothisnamespace

（3）GetHits-Numberoftimesthehandlesarealreadyallocatedinthecache.Ifthehandleisnotalreadyallocated,itisamiss.Thehandleisthenallocatedandinsertedintothecache.

（4）GetHitRatio-NumberofGETHITSdividedbyGETS.Valuescloseto1indicatethatmostofthehandlesthesystemhastriedtogetarecached.

（5）Pins-Numberoftimesthesystemissuespinrequestsforobjectsinthecacheinordertoaccessthem.

（6）PinHits-Numberoftimesthatobjectsthesystemispinningandaccessingarealreadyallocatedandinitializedinthecache.Otherwise,itisamiss,andthesystemhastoallocateitinthecacheandinitializeitwithdataqueriedfromthedatabaseor
generatethedata.

（7）PinHitRatio-NumberofPINHITSdividedbynumberofPINS.Valuescloseto1indicatethatmostoftheobjectsthesystemhastriedtopinandaccesshavebeencached.

（8）Reloads-Numberoftimesthatlibraryobjectshavetobereinitializedandreloadedwithdatabecausetheyhavebeenagedoutorinvalidated.

（9）Invalidations-Numberoftimesthatnon-persistentlibraryobjects(likesharedSQLareas)havebeeninvalidated.

（10）GetHitRatioandPinHitRatioshouldbe>70

/*
Formattedon2011/7/2110:58:02(QP5v5.163.1008.3004)*/

SELECTNAMESPACE,

GETS,

GETHITS,

ROUND(GETHITRATIO*100,2)gethit_ratio,

PINS,

PINHITS,

ROUND(PINHITRATIO*100,2)pinhit_ratio,

RELOADS,

INVALIDATIONS

FROMv$librarycache

七.ReservePoolSettings

SHAREDPOOLRESERVEDSIZENOTES:

（1）Parameter-Nameoftheparameter

（2）Value-Currentvaluefortheparameter

（3）shared_pool_reserved_size-ControlstheamountofSHARED_POOL_SIZEreservedforlargeallocations.ThefixedviewV$SHARED_POOL_RESERVEDhelpsyoutunetheseparameters.Beginthistuningonlyafterperformingallothersharedpooltuningonthesystem.

（4）shared_pool_reserved_min_alloc-Controlsallocationforthereservedmemory.Tocreateareservedlist,SHARED_POOL_RESERVED_SIZEmustbegreaterthanSHARED_POOL_RESERVED_MIN_ALLOC.OnlyallocationslargerthanSHARED_POOL_RESERVED_POOL_MIN_ALLOCcanallocate
spacefromthereservedlistifachunkofmemoryofsufficientsizeisnotfoundonthesharedpool'sfreelists.ThedefaultvalueofSHARED_POOL_RESERVED_MIN_ALLOCshouldbeadequateformostsystems.

/*
Formattedon2011/7/2110:59:50(QP5v5.163.1008.3004)*/

SELECTNAME,VALUE

FROMv$parameter

WHERENAMELIKE'%reser%'

八.PinnedObjects

PINNEDOBJECTNOTES:

（1）ObjectName-Nameoftheobject

（2）ObjectType-Typeoftheobject(INDEX,TABLE,CLUSTER,VIEW,SET,SYNONYM,SEQUENCE,PROCEDURE,FUNCTION,PACKAGE,PACKAGEBODY,TRIGGER,CLASS,OBJECT,USER,DBLINK)

（3）KeptStatus-YESorNO,dependingonwhetherthisobjecthasbeen"kept"(permanentlypinnedinmemory)withthePL/SQLprocedureDBMS_SHARED_POOL.KEEP

/*
Formattedon2011/7/2111:00:41(QP5v5.163.1008.3004)*/

SELECTNAME,TYPE,KEPT

FROMv$db_object_cache

WHEREKEPT='YES'

-------------------------------------------------------------------------------------------------------

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