Oracle?? ???? DDL? ?? ??
Oracle ???? DDL? ???? dbms_metadata.get_ddl ??? ???????. ??? ?? ?, 2. ?? ??? ???? ???? ?? ?? ???? ???? ?? ? ??? ??? ??? ??? ????? ??????. setPagesize0; SQL*Plus? ?? ???? ?? ???? ??? ?? 5. ? ?? ? ??? ???? ?? ? ? ????.
Aug 08, 2025 am 03:47 AM
Oracle?? SQL ??? ???? ??
?? theproblematicqueryusingawr, ash, sqltrace, orv $ sqltofindhigh-loadqueries; 2.analyzexecutionplanviaexplainplanordbms_xplantodetectineficienciessifivefulltablescansorjoinissues;
Aug 08, 2025 am 03:12 AM
Oracle? ?? ? ?????? ?? ??? ????, ??? ??????
?? ? ?????? ?? ?? I/O? ?? Oracle ??? ??? ????. ????? ??? ?? ??, PCTfree ?? ?? ?????. ChaineRows? ???? ??? ???? ?? ???? ??? ?? ? ???? ?? ????. ? ? ??? ?? ? ?????. ?? ??? ?? Chained_rows??? ?? ?? ? ? ??? AltertableMove ?? ???? ???? ?? ? ? ????. ???, ? ?? pctfree? ???? ??? ?? ??? ???? ???? ??? ??? ? ????. "TableFetchContinuedrow"? ?????? ?? ??? ? ??? ??? ? ???
Aug 08, 2025 am 02:47 AM
Pmon, Smon, DBWN, LGWR ? CKPT? ?? Oracle ?? ????? ??? ?? ? ? ?????
Oracle ??????? ?? ?? ?????? Pmon, Smon, DBWN, LGWR ? CKPT? ?????. PMON? ??? ??? ????? ????, ???? ?? ????? ????, ???? ???? ???? ??? ?????. SMON? ?? ?? ??? ?? ??? ??? ?? ??? ???? ?? ??? ?????. DBWN? ??? ??? ??? ??? ???? ???? I/O? ??? ?? ?? ??; LGWR? ???? ?? ??? ????? Redo Log ??? ???? ???. CKPT? ?? ???? ???? DBWN? ??? ???? ???? ?? ??? ??? ???????. ??? ????? ???? ??????? ???? ??? ???? ???? ?????.
Aug 07, 2025 pm 04:59 PM
Oracle? ????? ??? ???? ??
usegrantprivilege_nametousernameforsystemprivilegeslikecreatessessionorcreatetable.2.usegrantobject_privilegeonschema.objecttounameforobjectPrivileGessuChassElectorInspecifictables.3.grantroleswithgrantrole_nametousernametosimplymivilegema
Aug 07, 2025 pm 04:39 PM
Oracle?? JSON ???? ???? ???
Oracle Database? 12C ?? ????? JSON? ?????. varchar2, clob ?? blob columns? ???? ISJSON ?? ??? ???? JSON ???? 1 ? ??? ? ????. 2. JSON_VALUE? ???? ??? ?, JSON_QUERY? ???? ??? ?? ?? ??? ????, ?? ??? ?? ??? ?????? json_table; 3. JSON_EXISSS? ?? ?? ?? ??? ?? ?? ???; 4. ?? ??? ????? ?? ?? ?? ??? ?? oracletext ?? ??? ??????. 5. 19c ??? json_mergepatch ?? json_transform? ??????. 6. Isjson? ??????
Aug 07, 2025 am 11:24 AM
Oracle ???? ? ??????
anoracleInstanceisthein-memoryenvirondentconsisting-memorystructures ? backgroundProcessThatenableAccesstoandsmanagementofanoracledatabase
Aug 07, 2025 am 07:38 AM
Oracle?? ???? ??? ???? ??????
deleteisAdMlCommandTheRrowSoneatImeAtimewithfulllogging, supportswhereclauses, firestriggers, andallowsrollback; 2.truncateIsaddlCommand thatDeallocatesDatablocks, Sminimallogging, RemovesAllrowwhereclause, doSnotfirectrigger, andcannot
Aug 06, 2025 pm 02:41 PM
ORA-00942 : ??? ????? ???? ????
ORA-00942 ??? ????? ??? ? ??, ??? ??? ??? ??, ??? ??? ???, ??? ?? ???, ???? ?? ?? ?? DBLINK ??? ???? ???? ?? ?????. 1. ??? ??? ???? ???? ???? ???? ????? ??????. 2. Scott.emp? ?? ??? ???? ???? ??????. 3. ?? ???? ??? ??? ??? ??? ???? ??? ?? ?? ??? ???????. 4. ???? ??? ????? ???? all_tables ?? user_tables? ?? ?? ? ? ????. 5. ???? ???? ??, ??? ???? ???? ??????. 6. DBLINK? ?? ????? ?? ?? ???? ???? ??? ???? ???? ?? ?? ? ??? ??? ? ??? ?? ??? ???? ???????.
Aug 06, 2025 pm 02:06 PM
???? ??? ???? ???
?????? ? OracleHome? ???? ?? ???? ????, README ??? ????, ?? ????? ????, ??? ??? ??? ????, ?? ??? ???? ????, Opatch ??? ???? ??????. 2. MyoraclesUpport?? ??? ?????? ?? ????? ?? ??????. 3. OptchlSinventory? ???? OracleHome ? Inventory ??? ???? ?? Oracle_Home? ??????. 4. ?? ????? ?? ? ? OptChapply ??? ???? ??? ??????. RAC ??? -?? ?? ??? ???? ?? ??????? ???????. 5. ?? ??? ?? ???? ?? Catchl.pl ?? Datapatch ??? ??????.
Aug 06, 2025 am 07:59 AM
Oracle ???? ??????
anoraclesynymisanaliasforadatabaseobjectlikeatable, view, orprocedure, usedtosimplifysqlqueriesandmanageaccess.1) synonymeliMinateneedTopRefixObjectNameswithesChemaOwner (? : empinteadofhr.employees? ??) .2)
Aug 06, 2025 am 05:36 AM
Oracle?? ???? ????? ???? ??? ??????
adbacanchangeanotheruser'spasswordusingalteruserUserUserNameameMENDIFIDIFINGIFIDIFINIDIFINIDIDIFINIDIFITIONIDIFINIDIFINIDIFINIDIDIFINIDIFITIONDIFIDIFINIDIDIFINIDIFITIONDYNEW_PASSWORD;
Aug 05, 2025 pm 07:51 PM
Oracle Sid? ??????
TheoraclesIdUniqueLiqueDifiesAdatabaseInstancyStem; 1) ItdistancesInstancesSoSciatingThemsprocessesandMemoryAreas; 2) theos, oraclenet, andAdministrativeToolStotArggetScorrectinstance;
Aug 05, 2025 pm 02:14 PM
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