Oracle Rac (?? ?? ???? ????) ? ??????
MultiplenodestoaccessashareddatabaseSimully?? OracleracenableShighavailabilityandscalabilitys.1) SharedStoragesUchassAnorAracleAsmholdsthedatabasefileSaccessibletoallnodes.2) Oracleclertersw
Aug 22, 2025 pm 03:44 PM
Oracle JDBC ?? ??? ??
?? jdbc : oracle : thin : @hostname : port : sidforsid ?? ?? (? : jdbc : oracle : thin : @localhost : 1521 : orcl.2.usejdbc : oracle :@hostname : port/service_nameforservicenames, revinglefororacle12c Multitenant, ?? ??, JDBC : Oracle : Thin :@// localhost : 1521/xepdb
Aug 22, 2025 pm 02:04 PM
Oracle?? Spfile?? pfile? ??? ??
to thecreateapfilefromanspfileinoracle, connectassysdbausingsqlplus/assysdba; 2.executecreatepfile = ''fromspfile = ''; 3.ifpathsareOmitted, oracleUsesDefaultLocationsandNames; 4. threeSultingpfileisatextFileContainingCurramettersetting, letability withiate statting
Aug 22, 2025 pm 01:26 PM
Oracle?? ?? ??? ?? ???
v $ locked_object?? ?? ?? ID, ??? ??, ?? ?? ? ?? ??? ???? ?? ?? ??? ???? ??? ?????. 2. v $ ?? ? v $ ?? ?? ???? ?? ??? ???? ?? ?? ? ???? ??? ?????. 3. ?? ??? SID? ???? V $ SQL??? ????? ???? SQL ?? ????. 4. ?? ???? ?? ??? ??? ????? TM (??? ??) ? TX (Transaction Lock) ??? ?? ?? ??? ? ? ????. 5. ?? ? ????? ????? ????? AltersyStemKillsession ??? ???? ??? ?? ? ? ??????? ???????. v $ locked_object ? v $? ????
Aug 22, 2025 pm 12:53 PM
Oracle?? ?????? ??? ?????? ??
ToeffectivelymonitorOracledatabaseperformance,usethefollowingmethods:1.UseOracleEnterpriseManager(OEM)forreal-timedashboards,resourceusagetracking,andproactivealertsonmetricsliketablespaceandsessionlimits.2.LeverageAutomaticWorkloadRepository(AWR)tog
Aug 21, 2025 pm 06:10 PM
Windows 10? Oracle Database? ???? ??? ??????
Oracledatabase19C? ?? ? ???? ?? Windows 10? ????? ??? ? ????. ?? ??? ??? ????. 1. ???? 64 ?? Windows 10, ?? 4GB? ???, 10-20GB ??? ?? ? ??? ??? ?????????. 2. Oracle Software Delivery Cloud?? oracledatabase19c? Windows 64 ?? ??? ?????? ??? ????? ?? ??????. 3. ?? Windows ???? ? VisualC ??? ???? ? ???? ?????? ????? ?????. 4. ?? ????? ???? ?? ????? setup.exe? ??????. 5. ?? ????? ?? ???? ?????? ? ???? ??? ???? ??????.
Aug 21, 2025 am 10:33 AM
Oracle?? with ?? ???? ??
AlsoknownassubqueryFactoring, thewithClauseInoracle, inableStefiningCommontableExpressions (CTES) forimProvedQueryReadability ? Performance.1
Aug 21, 2025 am 08:28 AM
Oracle?? ??? ?? ??? ???? ??
Oracle Data ??? ??? ????? AlterDatabaseDataFile ??? ??? ? ????. 1. ??? ??? AlterDatabaseAdataFile'file_Path'Resizenew_Size? ???? ??? ??? ???? ? ??? ?? ???? ?? ???????. 2. ??? ??? ???? ?? ??? ?? ?? ??? ???? DBA_DATA_FILES? ???? ?? ?? ??? ???? ??? ???? ??? ? ? ??? ???????. ?? ?? ?? ?? ??? ??????. ??? ????? ??? ???? ????? ?? ???? ???????. 3. Autoextend? ?? ??? ???? ?? ?? ??? ??? ? ??? ?????. 4. ?? ?? ??? ??? ??????.
Aug 21, 2025 am 05:24 AM
Oracle? ?? ?? ??? (IoT)? ??????
anindexorganizedTable (IoT) inoraClestorestabledataWithinab-treeindexStructurebasedOntheprimarykey
Aug 20, 2025 pm 12:14 PM
Oracle?? ???? ?? ???? ??
Oracle ???????? ?? ??? ??? ?? ????? ?? DBA ????? ???? ??? ? ?? Alteruser ??? ???? ??? ?? ???????. ??? ?? DBA_USERS??? ???? ????? ????? ?? ??? ??? ? ????. ?????, ?? ???? ??? _login_attempts ??? ???? ?? ??? ??? ?? ? ? ????. 1. SYS ?? ???? ?? ???? ???? ??? : SQLPLUS/ASSYSDBA; 2. AlteruserUserNameAcCountUnlock? ?????. AlteruserscottaccountUnlock? ?? ??? ???? ?? ?????. 3. ?? ??
Aug 20, 2025 am 10:35 AM
????? ??? ??? ??
??, filters -likeusername, status, orprogram? ????#? ???? killthessessionusingaltersystemkillsession'sid, serial#'with with withercerclea, killthessessionusingaltersystemkillsession'sid? ???? thessessessessionbinningaqueryonv $ sessionTesidAndSerial#? ?????
Aug 20, 2025 am 09:29 AM
??? Oracle ??????? ???? ??
thepatchType (psu, ru, rur, orone-off) andreviewthereadmeonmyoraclesupportforcompatibility, pre-patchsteps ? downtimerequirements.2. ensureOpatchiscompatiblebodudateByRunningOpatchVersionAndOpatchLsInventory.3.
Aug 19, 2025 pm 02:57 PM
????? ? ??? ?? ??? ?? ??
Oracle?? ? ??? ?? ??? ???? ?? ????? ???? ??? ??? ????. 1. Row_number () ?? Rank () ??. ??? row_number ()? ? ?? ?? ? ??? ??? ???? ? ?? ?? ??? ?? ?? ? ?????. ?? ()? ?? ??? ?? ? ? ?? ??? ?? ???. 2. max () ? ?? ??? ???? SelectMax (Salary)? employeeswheresalary?? ??????
Aug 19, 2025 am 11:43 AM
Oracle?? Case ?? ???? ??
SearchSeeeValuatesbooleanconditionsinceenderturnsultoftruesttruecondition, ???? forcomplexlogiclikecizeMployeesalariesinto'low ','medium ', ??'high'basedonranges
Aug 18, 2025 am 06:13 AM
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