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Lecture 27: Size/Cost Estimation, Recovery

Lecture 27: Size/Cost Estimation, Recovery

Lecture 27: Size/Cost Estimation, Recovery. Wednesday, December 3 rd , 2003. Outline. Cost estimation: 16.4 Recovery using undo logging 17.2. Size Estimation. Need T(E) and V(E,a) in order to estimate cost and choose a good plan This is impossible without computing E

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500 views • 34 slides
Lecture 27: Size/Cost Estimation, Recovery

Lecture 27: Size/Cost Estimation, Recovery

Lecture 27: Size/Cost Estimation, Recovery. Wednesday, December 3 rd , 2003. Outline. Cost estimation: 16.4 Recovery using undo logging 17.2. Size Estimation. Need T(E) and V(E,a) in order to estimate cost and choose a good plan This is impossible without computing E

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341 views • 34 slides
Recovery from Crashes

Recovery from Crashes

Recovery from Crashes. ACID. A transaction is atomic -- all or none property. If it executes partly, an invalid state is likely to result. A transaction, may change the DB from a consistent state to another consistent state. Otherwise it is rejected (aborted).

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Transactions

Transactions

Transactions. A process that reads or modifies the DB is called a transaction . It is a unit of execution of database operations. Basic JDBC transaction pattern Connection conn = ...; conn.setAutoCommit(false); try { ... //JDBC statements } finally { conn.commit(); }.

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373 views • 25 slides
Transactions

Transactions

Transactions. A process that reads or modifies the DB is called a transaction . It is a unit of execution of database operations. Basic JDBC transaction pattern Connection conn = ...; conn.setAutoCommit(false); try { ... //JDBC statements } finally { conn.commit(); }.

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255 views • 25 slides
Examples

Examples

Examples. Undo, Redo, Undo/Redo. Undo Log. <START S> <S,A,60> <COMMIT S> <START T> <T,A,10> <START CKPT (T)> <START U> <U,B,20> <T,C,30> <START V> <U,D,40> <V,F,70> <COMMIT U> <T,E,50> <COMMIT T> <V,B,80> <COMMIT V>.

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73 views • 7 slides

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