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Locks are acquired in root-to-leaf order; they are released in leaf-to-root order The protocol ensures serializability, but not freedom from deadlock A multiversion concurrency-control scheme is based on the creation of a new version of a data item for each transaction that writes that item When a read operation is issued, the system selects one of the versions to be read The concurrency-control scheme ensures that the version to be read is selected in a manner that ensures serializability, by using timestamps A read operation always succeeds In multiversion timestamp ordering, a write operation may result in the rollback of the transaction In multiversion two-phase locking, write operations may result in a lock wait or, possibly, in deadlock Various locking protocols do not guard against deadlocks One way to prevent deadlock is to use an ordering of data items, and to request locks in a sequence consistent with the ordering Another way to prevent deadlock is to use preemption and transaction rollbacks To control the preemption, we assign a unique timestamp to each transaction The system uses these timestamps to decide whether a transaction should wait or roll back If a transaction is rolled back, it retains its old timestamp when restarted The wound wait scheme is a preemptive scheme If deadlocks are not prevented, the system must deal with them by using a deadlock detection and recovery scheme To do so, the system constructs a wait-for graph A system is in a deadlock state if and only if the wait-for graph contains a cycle When the deadlock detection algorithm determines that a deadlock exists, the system must recover from the deadlock It does so by rolling back one or more transactions to break the deadlock A delete operation may be performed only if the transaction deleting the tuple has an exclusive lock on the tuple to be deleted A transaction that inserts a new tuple into the database is given an exclusive lock on the tuple Insertions can lead to the phantom phenomenon, in which an insertion logically con icts with a query even though the two transactions may access no tuple in common Such con ict cannot be detected if locking is done only on tuples accessed by the transactions Locking is required on the data used to nd the tuples in the relation The index-locking technique solves this problem by requiring locks on certain index buckets These locks ensure that all con icting transactions con ict on a real data item, rather than on a phantom Weak levels of consistency are used in some applications where consistency of query results is not critical, and using serializability would result in queries adversely affecting transaction processing Degree-two consistency is one such weaker level of consistency; cursor stability is a special case of degree-two consistency, and is widely used SQL:1999 allows queries to specify the level of consistency that they require.

The McGraw Hill Companies, 2001

Summary

above the storyboard that replaced the scene album) You can also open the toolbox by double-clicking the scene

The units of f are hertz (Hz) The period T tells us the duration of a single cycle in the wave It is related to frequency using f = 1 T (725)

Special concurrency-control techniques can be developed for special data structures Often, special techniques are applied in B+ -trees to allow greater concurrency These techniques allow nonserializable access to the B+ -tree, but they ensure that the B+ -tree structure is correct, and ensure that accesses to the database itself are serializable

Concurrency control Lock types Shared-mode (S) lock Exclusive-mode (X) lock Lock Compatibility Request Wait Grant Deadlock Starvation Locking protocol Legal schedule Two-phase locking protocol Growing phase Shrinking phase Lock point Strict two-phase locking Rigorous two-phase locking Lock conversion Upgrade Downgrade Graph-based protocols Tree protocol Commit dependency Timestamp-based protocols Timestamp System clock Logical counter W-timestamp(Q) R-timestamp(Q) Timestamp-ordering protocol Thomas write rule Validation-based protocols Read phase Validation phase Write phase Validation test Multiple granularity Explicit locks Implicit locks Intention locks Intention lock modes Intention-shared (IS) Intention-exclusive (IX) Shared and intentionexclusive (SIX) Multiple-granularity locking protocol Multiversion concurrency control Versions Multiversion timestamp ordering Multiversion two-phase locking Read-only transactions Update transactions Deadlock handling Prevention Detection Recovery Deadlock prevention Ordered locking Preemption of locks Wait die scheme Wound wait scheme Timeout-based schemes

The McGraw Hill Companies, 2001

Click here to split the scene at the current position FIGURE 4-1

1 1 2

16

Deadlock detection Wait-for graph Deadlock recovery Total rollback Partial rollback Insert and delete operations Phantom phenomenon Index-locking protocol Weak levels of consistency

Degree-two consistency Cursor stability Repeatable read Read committed Read uncommitted Concurrency in indices Crabbing B-link trees B-link-tree locking protocol Next-key locking