April 2008
Intermediate to advanced
566 pages
21h 55m
English
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Name
XA
Synopsis
XA {START|BEGIN} 'identifier' [JOIN|RESUME]
XA PREPARE 'identifier'
XA COMMIT 'identifier' [ONE PHASE]
XA ROLLBACK 'identifier'
XA RECOVER
XA END 'identifier' [SUSPEND [FOR MIGRATE]]This statement is used for XA distributed transactions. These are transactions in which multiple, separate transactional resources may be involved in a global transaction. In MySQL, this is currently available only with InnoDB tables.
The XA START statement starts an XA
transaction, assigning an identifier to be used in subsequent
statements, and puts the transaction into an ACTIVE
state. Implicit commits cannot be made while the transaction is in
ACTIVE state. This statement is synonymous with
XA BEGIN. The JOIN and
RESUME keywords are not supported.
Once you’ve entered all of the SQL statements for a particular
session, mark the transaction as PREPARED by
executing an XA PREPARE. XA
RECOVER lists all transactions in a prepared state. Use the
XA COMMIT ONE PHASE statement to mark the XA
transaction just given as prepared and committed. XA
COMMIT without the ONE PHASE keyword
will commit and end the entire transaction. Use XA
ROLLBACK to undo the specified XA transaction and terminate
it. XA END ends the specified transaction and puts
it into an IDLE state.
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