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Who Is Holding Library Cache Lock

 
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MessagePosté le: Ven 29 Déc - 00:10 (2017)    Sujet du message: Who Is Holding Library Cache Lock Répondre en citant




Who Is Holding Library Cache Lock
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kkkk-dddd-llll=0000-0001-0001,,lock,,.,,I,,could,,have,,dumped,,the,,library,,cache,,.,,I,,could,,have,,used,,the,,library,,cache,,dump,,to,,examine,,the,,exact,,library,,.library,,,,cache,,,,load,,,,lock.,,,,The,,,,session,,,,tries,,,,to,,,,find,,,,the,,,,load,,,,lock,,,,for,,,,the,,,,database,,,,object,,,,so,,,,that,,,,it,,,,can,,,,load,,,,the,,,,object.,,,,The,,,,load,,,,lock,,,,is,,,,always,,,,obtained,,,,in,,,,Exclusive,,,,.Process,,hung,,on,,library,,cache,,lock.,,Customer,,reported,,a,,system,,slowdown/process,,hung,,during,,small,,and,,well,,defined,,period,,of,,time,,and,,it,,was,,related,,to,,one,,.Recently,,I,,noticed,,a,,lot,,of,,parallelized,,queries,,(create,,table,,as,,select.),,which,,cause,,high,,library,,cache,,lock,,concurrancy.,,In,,the,,following,,question,,Mihail,,stated,,.Library,,,,Cache,,,,Locks,,,,.,,,,Library,,,,Cache,,,,contention,,,,is,,,,a,,,,serious,,,,issue,,,,In,,,,most,,,,cases,,,,it,,,,would,,,,be,,,,good,,,,to,,,,analyze,,,,what,,,,is,,,,holding,,,,the,,,,library,,,,cache,,,,lock,,,,and,,,,.Oracle,,notes,,that,,the,,library,,cache,,lock,,controls,,concurrency,,between,,clients,,in,,the,,library,,cache.,,The,,library,,cache,,lock,,acquires,,a,,lock,,on,,the,,.Performance,,Tuning,,Wait,,event,,:,,library,,cache,,pin,,and,,library,,.,,The,,exclusive,,lock,,request,,for,,session,,3,,is,,not,,compatible,,with,,the,,lock,,modus,,already,,hold,,by,,.Dion,,Cho,,,,Oracle,,Performance,,Storyteller.,,.,,to,,hold,,the,,row,,cache,,lock,,.,,INVALIDUNAUTH,,keep,,buffer,,pool,,library,,cache,,latch,,lock,,escalation,,.[Oracle],,Wait,,event,,library,,cache,,lock,,by,,(security),,design,,and,,exploring,,system,,state,,dumps,,(oradebug),,November,,10,,,2012,,,,3,105,,ViewsLibrary,,Cache,,contention,,is,,a,,serious,,issue.,,In,,most,,cases,,it,,would,,be,,good,,to,,analyze,,what,,is,,holding,,the,,library,,cache,,lock,,and,,killing,,it,,will,,resolve,,.Posts,,,,about,,,,library,,,,cache,,,,lock,,,,written,,,,by,,,,Riyaj,,,,Shamsudeen.,,,,.,,,,We,,,,can,,,,see,,,,that,,,,PID,,,,12741,,,,from,,,,instance,,,,1,,,,is,,,,holding,,,,a,,,,library,,,,cache,,,,global,,,,lock,,,,[LB].Library,,,,Cache:,,,,Mutex,,,,X,,,,,,,,Bug,,,,20879889,,,,.,,,,5487,,,,row,,,,cache,,,,lock,,,,.,,,,more,,,,time,,,,and,,,,holding,,,,enqueue,,,,locks.The,,,,library,,,,cache,,,,lock,,,,controls,,,,the,,,,concurrency,,,,between,,,,clients,,,,of,,,,the,,,,library,,,,cache,,,,by,,,,acquiring,,,,a,,,,lock,,,,on,,,,the,,,,object,,,,handle,,,,.,,,,thresholds,,,,should,,,,hold,,,,TRUE,,,,.The,,library,,cache,,lock,,event,,is,,also,,associated,,with,,library,,cache,,concurrency.,,A,,session,,must,,acquire,,a,,library,,cache,,lock,,on,,an,,object,,handle,,to,,prevent,,.Library,,cache,,lock,,scripts,,for,,RAC.,,.,,The,,challenge,,is,,to,,figure,,out,,what,,is,,holding,,the,,library,,cache,,locks,,that,,the,,queries,,are,,waiting,,on.HOW,,,,TO,,,,FIND,,,,THE,,,,SESSION,,,,HOLDING,,,,A,,,,A,,,,LIBRARY,,,,CACHE,,,,LOCK,,,,.Protects,,changes,,in,,Library,,Cache,,Library,,Locks,,are,,not,,atomic,,.,,The,,mutex,,pin,,for,,a,,cursor,,object,,can,,be,,busy,,either,,because,,a,,session,,is,,already,,holding,,it,,.How,,,,to,,,,Find,,,,which,,,,Session,,,,is,,,,Holding,,,,a,,,,Particular,,,,Library,,,,Cache,,,,Lock,,,,.library,,,,cache,,,,lockOracle,,,,RAC,,,,10g,,,,Cache,,,,Fusion46,,,,Comments,,,,Posted,,,,by,,,,advait,,,,on,,,,July,,,,.Resolving,,,a,,,library,,,cache,,,lock,,,issue.,,,.,,,Another,,,method,,,to,,,find,,,the,,,session,,,holding,,,library,,,cache,,,lock,,,is,,,described,,,here.,,,Posted,,,by,,,Yu,,,Denis,,,Sun,,,at,,,8:13,,,AM.This,,lock,,is,,also,,obtained,,to,,locate,,an,,object,,in,,the,,library,,cache.,,Library,,cache,,lock,,will,,be,,obtained,,on,,database,,objects,,.,,it,,must,,hold,,a,,exclusive,,lock,,for,,.Library,,cache,,locks,,and,,library,,cache,,pin,,waits:,,.Latch,,,and,,,Mutex,,,Contention,,,Troubleshooting,,,in,,,Oracle,,,.,,,butsomeone,,,is,,,already,,,holding,,,it!,,,To,,,troubleshoot,,,,.library,,,,cache,,,,lock.,,,,This,,,,event,,,,controls,,,,the,,,,concurrency,,,,between,,,,clients,,,,of,,,,the,,,,library,,,,cache.Library,,,,cache,,,,wait,,,,events,,,,in,,,,RAC.,,,,Hi,,,,,.,,,,Library,,,,cache,,,,lock,,,,.,,,,Library,,,,load,,,,lock,,,,The,,,,Library,,,,Cache,,,,wait,,,,events,,,,typically,,,,occur,,,,in,,,,the,,,,following,,,,4,,,,.RE:,,,,library,,,,cache,,,,lock.,,,,.,,,,Find,,,,why,,,,that,,,,session,,,,is,,,,holding,,,,the,,,,library,,,,cache,,,,lock.,,,,.,,,,SQL,,,,will,,,,give,,,,you,,,,a,,,,map,,,,of,,,,sessions,,,,waiting,,,,and,,,,holding,,,,library,,,,cache,,,,locks.Most,,,of,,,the,,,info,,,discussed,,,here,,,are,,,from,,,Metalink,,,Note,,,444560.1.,,,The,,,library,,,cache,,,lock,,,event,,,is,,,also,,,associated,,,with,,,library,,,cache,,,concurrency.The,,,alert,,,log,,,won't,,,tell,,,you,,,who,,,(which,,,user,,,and,,,session),,,is,,,holding,,,that,,,lock,,,,but,,,V$LOCKEDOBJECT,,,will;,,,.,,,'LP','Library,,,Cache,,,Lock',,,,.Which,,,means,,,somebody(session),,,is,,,holding,,,library,,,cache,,,lock,,,in,,,exclusive,,,mode,,,for,,,a,,,such,,,long,,,time.V$LIBCACHELOCKS,,,,displays,,,,information,,,,about,,,,the,,,,library,,,,cache,,,,locks,,,,and,,,,pins.,,,,.,,,,User,,,,session,,,,holding,,,,this,,,,lock/pin:,,,,HOLDINGSESSION:,,,,RAW(4,,,,,,,,8),,,,Session,,,,holding,,,,this,,,,.This,,,,means,,,,there,,,,is,,,,at,,,,least,,,,one,,,,other,,,,session,,,,holding,,,,a,,,,lock,,,,on,,,,some,,,,stored,,,,procedure,,,,which,,,,exp,,,,is,,,,trying,,,,to,,,,.,,,,Resolving,,,,library,,,,cache,,,,pin,,,,.Library,,,,Cache,,,,Latch,,,,contention,,,,can,,,,occur,,,,.,,,,In,,,,the,,,,above,,,,output,,,,you,,,,can,,,,see,,,,that,,,,session,,,,110,,,,is,,,,holding,,,,share,,,,lock,,,,on,,,,two,,,,.,,,,The,,,,library,,,,cache,,,,lock,,,,happens,,,,even,,,,.The,,Oracle,,library,,cache,,pin,,wait,,event,,occurs,,when,,the,,session,,tries,,to,,pin,,an,,object,,in,,the,,library,,cache,,to,,.,,that,,are,,holding,,and/or,,requesting,,.MidwayUSA,,,is,,,a,,,privately,,,held,,,American,,,retailer,,,of,,,various,,,hunting,,,and,,,outdoor-related,,,products.Embarcadero,,,DB,,,Optimizer.,,,Search,,,this,,,site.,,,.,,,library,,,cache,,,lock,,,.,,,The,,,mutex,,,pin,,,for,,,a,,,cursor,,,object,,,can,,,be,,,busy,,,either,,,because,,,a,,,session,,,is,,,already,,,holding,,,it,,,.LIBRARY,,,CACHE,,,LOCK,,,AND,,,PIN,,,DEMONSTRATED.,,,December,,,16,,,,2012,,,Database,,,,.Library,,,cache,,,locks:,,,a,,,case,,,study.,,,.,,,(KILLED,,,status,,,,but,,,still,,,not,,,cleaned,,,up,,,by,,,PMON,,,for,,,whatever,,,reason),,,,while,,,holding,,,a,,,library,,,cache,,,lock,,,itself,,,,.Metalink,,,,Note:,,,,122793.1,,,,"HOW,,,,TO,,,,FIND,,,,THE,,,,SESSION,,,,HOLDING,,,,A,,,,LIBRARY,,,,CACHE,,,,LOCK",,,,describes,,,,two,,,,methods,,,,to,,,,find,,,,the,,,,blocking,,,,session:,,,,1.The,,,library,,,cache,,,load,,,lock,,,Oracle,,,metric,,,occurs,,,when,,,the,,,process,,,is,,,waiting,,,for,,,the,,,opportunity,,,to,,,load,,,an,,,object,,,or,,,a,,,piece,,,of,,,an,,,. 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