DB2 9 vs Oracle 10g Admin. Technology - IBM

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DB2 Information Management동시성ANSI 분리 레벨 개요ANSI 분리 레벨Repeatable ReadRead StabilityCursor StabilityUncommitted Read잠금 영향결과집합에 영향을 미치는 모든 행들에 대해 트랜잭션이 마칠 때까지잠금을 보유(Any row that is referenced in any mannerto produce a result set is locked until thetransaction ends)실제적으로 검색된 모든 행들에 대해 트랜잭션이 마칠 때까지 잠금을보유(Any row that is actually retrieved to producethe result set is locked until the transaction ends)결과집합중현재참조되는행에대해서만cursor가이동하거나또는트랜잭션이 마칠 때까지 잠금을 보유(Only the row that iscurrently being referenced in that result set islocked until that cursor is repositioned or thetransaction ends)트랜잭션이 실행되는 동안 잠금을 확보하지 않음(No locking isdone on any records at any time during atransaction (with the exception of a dropped oraltered table which is not transactional anyway))DB2 9 vs Oracle 10g© 2008 IBM Corporation 86
DB2 Information Management동시성ANSI 분리 레벨 – 동시성이슈해결ANSI IsolationLevelJ2EE Isolation Level *Old DataReads?LostUpdates?UncommittedReads?NonrepeatableReads?PhantomReads?Repeatable ReadSerializationNoNoNoNoNoRead StabilityRepeatable ReadNoNoNoNoYesCursor StabilityRead CommittedNoNoNoYesYesUncommitted ReadRead UncommittedNoNoYesYesYes* From Oracle’s documentation on J2EE isolation levels:http://www.oracle.com/technology/oramag/oracle/03-may/o33j2ee_2.html#t4Phantom ReadsConcurrency Problems . . .Lost UpdatesUncommitted ReadsNonrepeatable ReadsDB2 9 vs Oracle 10g© 2008 IBM Corporation 87
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IBM Software GroupDB2 9 vs Oracle 1
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IBM Software GroupDB2 소개및개
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DB2 Information ManagementDB2 Expre
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DB2 Information Management툴및제
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DB2 Information ManagementDB2 Histo
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DB2 Information ManagementDB2 인
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DB2 Information Management서버
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DB2 Information Management서버
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DB2 Information Management메모리
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DB2 Information Management중요
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DB2 Information ManagementOracle
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DB2 Information Management환경 /
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DB2 Information ManagementINIT.ora
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DB2 Information ManagementCLP 도
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DB2 Information ManagementCLP Histo
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Page 39 and 40: DB2 Information Management물리
Page 45 and 46: DB2 Information Management기타관
Page 47 and 48: DB2 Information Management아키텍
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Page 90 and 91: 동시성잠금 모드DB2 Informati
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DB2 9 vs Oracle 10g Admin. Technology - IBM

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