Oracle? ??? ??? ???? ??????
UnionreMovesDuplicatesByperformatesBeppormingAdistIncteration, MateItsLowerDuetosortingandDuplicateChecking, while22.unionallinAllInAllSuplUdEsWithoutCateChecking, MakingItfasterandMoreFerficient, SouseUnion whouseUniOn whouseUniOniquerUntsAreneEdedAndUnallandUnAllUnallunallunallwhenserall
Aug 26, 2025 am 07:17 AM
Oracle?? ???? ???? ??
Oracle ???? ????? ?? DBMS_STATS.GATHER_TABLE_STATS? ???? ?? ??? ???? 1. ?? _table_stats? ???? ?? ??? ?????. 2. ??? ?? ??? ??? ?? dba_tables, dba_tab_columns ? dba_indexes; 3. ?? ??? ?????? ??? ????? DBA_TAB_STATISTICS?? stale_stats? ??????. 4. ??? ??? ???? ??? ??, ?? ?? ? ??? ??????. 5. ?? ??? ???? ?? ?? ??? ???? Optimizer? ????? ????? ???? ???? ????? ???? ??? ??????.
Aug 26, 2025 am 06:37 AM
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theashreportinoraclestandsforactivessessionhistoryreport, AdiagnostictoolforanalyzingdatabaseperformanceSuesCapturingSessionActivityEverySecond; ithelpSidentifyTopSql, Waitevents, ?? ? ?? ? Blockingsessionsessionssessions throughhighhigh-resolutiondata-fromev $ activ
Aug 25, 2025 pm 02:37 PM
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AtriggerInoracleSastoredProgram thateAtomically excutessinthedAtabase? ??, unsificificeventoccursinthedatabase; unlikestored procedures, triggersareinvokedimplyByventSsuchasinsert, update, ordeleteOnatableOrview ? theyrunwithinthesametranstatingStat
Aug 25, 2025 am 11:03 AM
Oracle ??????? 12C?? 19C? ??????? ??? ??????
?, Oracle ??????? 12C?? 19C? ??????? ?? ?????. 1. ?? ?? ?????? ??? 12.1.0.2 ?? 12.2.0.1?? ???? ??? ?????. 2. ??????, OracleHome ? ?? ????? ??; 3. ?? ?? ???, ??? ??? ???? ?? ??? ??????. 4. ?? ???? ???? ?? ?? ????? ????? preupgrade.jar? ??????. 5. Oracle19C ?????? ???? DBUA ?? ?? ??? ???? ?????? ??????. ??? ?? ?? ??? ???? ????? ???? CATCTL.pl? ???????. 6. ????? ? ?? ??? ???? ????? ? ????? ???? ???? ?????? Compatib? ????????.
Aug 25, 2025 am 03:08 AM
Oracle? ??? ??????
afunctioninoracleSanamedpl/sqlblockthattretretHeSturnSassingSoungleValueAndCanBeusedInsqlqueriSexpressions.1) itmustreturnavalueusingThereturnClause.2) itcanbeusedInsqLifitMeetSrestrictionSlikenotContainingdMllStatements.3) Itupports.4) 4
Aug 25, 2025 am 01:39 AM
Oracle? ??? ????? ??????
AtableSpaceInoracleSalogicalStorageUnitThoupsGroupsDatabaseObjectSliketablesandIndexEsandEdexesAndeDAtafiles.1.itbridgesthelogical ? physicaldatabasestructures, wherelogicalcomponents (? : Tables) ??? ?? ??? ?????
Aug 24, 2025 pm 04:48 PM
Oracle?? Ash ???? ???? ??
OracleAsh ???? ????? ASHRPT.SQL ????? ???? DBA ???? ???? ????? ???? ??? ?? (? : HTML)? ???? ?? ?? ?? (??? 30 ?)? ???? ???? ??? ??? ?????. ?? ??? ?? ???? ?? Ashrpti.sql? ???? DBID, ???? ?? ? ?? ? ?? ??? ?? ? ? ????. ?? ????? ?? ??? ?? ??? ?? ???, SQL ?, ?? ? ??? ???? ???? ???? ???? oraclediagnosticspack ????? ?????.
Aug 24, 2025 pm 04:38 PM
Alert Log? ??? ???? ?? Oracle
Fororacle11GandLater, QuerySelectValuefromv $ diag_infowherename = 'diagtrace'; tolocateThealertLogDirectory, wherEtheFileisNamedAlert_.log; 2.FororacleGandAndeArlier, useshOwParameterBackBack_dump_DestToctoryCCONTAINININGINGENINGINUNINGINGENUNINGENINGINGENINGENINGINGENINGONGENINGEARTORET;
Aug 24, 2025 pm 04:30 PM
Oracle?? ?? ??? ???? ??
Oracle?? ?? ??? ????? ?? v $ locked_object ? v $ ????? ???? ??? ???? ??? ?????. 1. select ?? ???? v $ locked_object, dba_objects ? v $ ??? ???? SID, OS ???, ????, ?? ? ?? ??? ???? ??? ?? ??? ?????. 2. ??? ???? V $ ???? ? ????? ?? ? ?? ? ??? ???? ?? ??? ???? ?? ID? ???? ??? ? ???? ?? ?? ??? ??????. 3. ?? ??? ?? ?? SID? ???? ?? ? SQL ?? ??
Aug 24, 2025 pm 04:11 PM
Oracle Data Guard?? ??? ???? ??
verifydataguardconfigurationAnchronizationDatabaseroles, redotransport, andapplystatusonbothsprimaryandstandbyDatabase.2.initiateswitchoverontheprimaryusingalterdatabasecommittoswitchovertostandbywithsshutdown, thenshut downdown and thounthounthoundwhutdown
Aug 23, 2025 pm 04:21 PM
Oracle? ??? ????? ??? ??? ???? ??? ??????
ToaddadatafiletoatablespaceinOracle,usetheALTERTABLESPACEcommand;1.EnsureyouhaveALTERTABLESPACEprivilegeandsufficientdiskspace;2.Forasmallfiletablespace,runALTERTABLESPACEtablespace_nameADDDATAFILE'path'SIZEsizeAUTOEXTENDONNEXTnext_sizeMAXSIZEmax_siz
Aug 23, 2025 pm 02:41 PM
Oracle?? RMAN? ??? ???? ??
ConnectTormanusing "rmantarget/"orwithcredentialsforRemoteAccess; 2. PerformafullDatabaseBackupwith "BackupDatabase;"?? AfterenablingControlfileautobackupvia "ConfigeRecontrolfileautobackupon; 3. Assistignattobackupsing"BA
Aug 23, 2025 pm 02:16 PM
Oracle ?????? ??? ?? ??
QueryThev $ versionViewTogetDeaLeDversionInInInFormationUsingSelectFromv $ ??;
Aug 23, 2025 am 05:56 AM
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