Oracle Real Application Clusters (RAC) ? ??????
oracleracenleysillemultipleservailabasesimultorhighavailability ? scalability; 1) sharedstorageholdsthedatabasefilesaccessibletoallnodes, ????? Viasanornfs; 2) Clusterwaremanagesnodecommunication, Healthmonitoring ? Failover; 3) Cach
Aug 18, 2025 am 04:51 AM
Oracle Goldengate?? ??? ???? ??
usetheggsciinfocommandtochextractandreplicatlagbyrunning "info-extract, detail"? "inforeplicat, detail"toviewtheCurrentDelayinApplyingTransactions.2.usetheendCommandwitHeAreal-timelagReporting, SendAs "SendTractext1, g
Aug 18, 2025 am 04:30 AM
Oracle ??????? ?? ??? ???? ??
querydba_registry_sqlpatchtoviewpatchdetails likepatch_id, action_time ? action_time ? statusfororacle12candlater; 2.checkv $ versionandv $ instancetogetthebasedatabaseversion, ????? (?? ??, 19.18), indicatestappliedupdate;
Aug 18, 2025 am 12:24 AM
Oracle?? ???? ??? ??
??? ???? ??? ??? CreateIndex ?? ???? ????. 1. ??, ??, ??, Orderby ?? GroupBy?? ????? ???? ?? ???? ?? ??????. 2. B-Tree (???), ?? ???, ?? ? ??? (?? ?? ? ???? ????? OLTP??? ? ?), ????? ??? ?? ??? ? ???? ?? ??? ??? ??? ??????. . 4. ??? ????, PCTFree, ???? ? ?? ????? ?? ? ? ????.
Aug 17, 2025 pm 12:14 PM
Oracle? AWR ???? ??????
THEAWRREATISACRITICALORECEDICEDICEDICLECOLOFORANALYZINGDATABASEPERFORMANCANCANGOVERTIME; ITISGENERTERATERATEDTWOSNAPSHOTSFPERFORMANCENDACELDECITEREVERYHOURHOUR, SQLEXECUTION, WATEVENTS, RESSORCEUSAGE ? OBJECTACT? ?????
Aug 17, 2025 am 09:11 AM
Oracle Database Security? ??? ??????
RolesinOracleDatabasearenamedgroupsofprivilegesthatstreamlineaccessmanagementbyallowingadministratorstoassignmultipleprivilegestousersviaasinglerole.1)Aroleactsasacontainerforsystemandobjectprivileges,suchascreatingtablesorselectingfromspecifictables
Aug 17, 2025 am 08:58 AM
Oracle?? ?????? ??? ???? ??
?????? ??? ???? createAbaselink ??? ???? ?? ???, ?? ? ?? ???? ???????. 2. dual@ link name? ???? ?? ???? ???????. 3. @ ?? ??? ???? SQL? ?? ???? ???????. 4. DropDatabasElink? ???? ??? ? ?? ???? ?? ? ??? ??????. ?????? ??? ???? Oracle? ????? ???? ???? ???? ?? ? ? ??? ORA-12154, ORA-01017? ?? ??? ??? ?? ????, ?? ? ??? ???? ???????. OracleWallet? ?? ?? ??? ???? ?? ??? ???? ?? ?? ??? ????? ?? ????.
Aug 17, 2025 am 04:40 AM
Oracle vs PostgreSQL ?? ??
OracleisBetterforenterPriseEnvirondentsNeedingHighavailabilityAndergulationalCompliance, whilepostgresqlisidealforcoscoscost-insensitive, modern, and cloud-nativeApplicationsDuetoitsopen-sourceflexibility, strongextensibility, andlowertotalcostofownership.
Aug 16, 2025 pm 01:42 PM
ORA-01017 : ??? ??? ??/????; ???? ???????
ORA-01017 ??? ???? ???? ?????? ?????. ?? ??? ??? ???? ????? ?????? ?? ??? ?????? ?????. 1. ??, ??? ??? ????? ???? ???? ?? ? ??? ? ?? ??? ?? ????? ???????. 2. ??? ??? ?? ?? SID? ???? ???? TNSPing ???? ?? ??? ? ????. 3. ??? ?? ??? ?? ??? ????? ???? DBA? DBA_USERS??? ???? ??? ???????. 4. ??? ?? ??? ?? ? ?? ??? ?? ???? ?????? Alteruser ??? ???????. 5. Oracle11g ??? ??? ????? ?? ??? ???? ??? ???? ???????. 6. SYS? ?? ?? ????? ??? ? ? AssySDBA ???? ???? ??? ???????.
Aug 16, 2025 pm 01:04 PM
Oracle? ??? ? ??????
ApackageInoracledatabaseisAschemaobjectHoutGroupSPrellatpl/sqlcomponentsforBetTerOrganizationAndizationAndiversity; 1.thepackagesPecificationDefinesCessIbleccessOmponents likeProcedures ? Functionswithoutimpletation;
Aug 16, 2025 am 12:32 AM
ORA-00942 ?? ?? ?? : ??? ????? ???? ????.
?? ??? ?? ?? ??? ???? ???? ??????. Object_name, Object_typefromdba_objectswhereobject_name = 'your_table_name'? ??????. ????? ?? user_objects? ???? ??? ??????. 1. ??? ????? ???? ??? ??? ???? ?????? (???? ?? ? ?? ??? ??? ??? ??????). 2. ??? ??? ???? DBA_TAB_PRIVS? ?? ??? ?? ?? ??? ??? ??? ??????. ??? ?? DBA? ??? ??? ?????. 3. SQL ? .TA? schema_name? ???? ???? ??? ??
Aug 15, 2025 pm 03:23 PM
Oracle?? ???? ?? ??? ????? ??
??, CheckHurrentArchivelogStatUsUsSelectLog_Modefromv $ Database; orarchivelogList; TOCONFIRMIFTHEDATABASEINNOARCHIVELOGMODE.2.SHUTDERDATABASEWITHITSHUTSHUTSHUTSHUTDODITE; .3.STARTTHEDABASEINMOUNTSTARTUPMOUNT;
Aug 15, 2025 pm 12:24 PM
Oracle?? ?? ??? ???? ??
??, Query v $ session ? v $ sql to setsions to with status ? ?? ??? ?? ?? ?????. 1. v $ session? v $ sql? ???? Last_call_et? ?? ? ??? ???? SQL? ????. 2. Query v $ session_longops ?? ??? ?? ?? ???? ???? ?? ??? ?? ??? ????. 3. V $ SQL? ?? ELAPSED_TIME? ???? Historical SQL? ???? ??? ?? ??? ???? ????? ?? ?? ??? ?? ???? ????? ??? ? ????? ?? Oracle? ?? ? ?? ??? ?? ??? ? ????? ?????.
Aug 15, 2025 am 06:01 AM
Oracle?? ???? ?? ??? ?? ????? ??
Oracle ???????? ???? ?? ??? ?? ?????? ?? ???? ?? ??? ?? ? ?? ??? ?? ?? ??? ? ?? ?? ?? ???? ???? ??? ???????. 1. Selectowner, Object_name, Object_type, statusfromdba_objectswherestatus = 'Invalid'OrderByowner, object_type? ??????. ?? ??? ??. DBA ????? ?? user_objects ?? all_objects? ??????. 2. Alter ??? ???? AlterProcedure, Alterf? ?? ?? ??? ?? ???????.
Aug 15, 2025 am 12:25 AM
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