Locking unit 1 topic 3

Locking fundamentals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency control techq ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Locking concept ,[object Object],[object Object],[object Object],[object Object]

Understanding locks and transactions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LOCK TABLE statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Packaged Applications and Locking (ex. of locking) ,[object Object],[object Object],[object Object],[object Object]

Locking in oracle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Locks ,[object Object],[object Object],[object Object]

Example of locks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example of locks contd … ,[object Object],[object Object],[object Object],[object Object]

Concurrent access with transaction

deadlocks ,[object Object],[object Object]

Deadlocks and transaction dependency graph

Detecting and Resolving Lock Conflicts ,[object Object],[object Object]

Detecting Lock Conflicts ,[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock in oracle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Choosing a locking strategy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Choosing a locking strategy Practically ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Serial equivalent order on conflict ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Pessimistic concurrency control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is 2PC(Two phase Commit)? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Two phase commit ,[object Object],[object Object],[object Object]

2PC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Two PC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TWO PC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2PL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Two phase locking Rules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why 2PL? ,[object Object],[object Object],[object Object],[object Object],Thus 2PL guarantees that T “won the race” for all the locks... ...or else a deadlock would have resulted. T: R(A) W(A) R(C) W(C) S: R(A) R(C) A C T S T S

Why 2PL? ,[object Object],[object Object],[object Object],[object Object],T: R(A) W(A) R(C) W(C) S: R(A) R(C) A T: R(A) W(A) R(C) W(C) S: R(A) R(C) C A C T S T S

More on 2PL(from Ramakrishnan) ,[object Object],[object Object],[object Object],[object Object],[object Object]

2PL(from Ramakrishan) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency control by time stamps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Time stamp based concurrency control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency control without locking ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Optimistic and pessimistic approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Optimistic contd…(validation based protocol) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock prevention ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock Recovery ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conservative 2PL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thomas Write Rule ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Locking unit 1 topic 3

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Locking unit 1 topic 3