The SET TRANSACTION statement configures the transaction and starts it. Refer to SET TRANSACTION for information on the meaning of the parameters to this statement. The exceptions are the occasions when the server starts an autonomous transaction or transactions for certain background system threads/processes, such as sweeping.

As a rule, only client applications start transactions.

The read and write keys have array values containing a single key: host.

This is the same as the BEGIN command. If a write statement occurs while a read transaction is active, then the read transaction is upgraded to a write transaction if possible. Specifies that data read by any statement in a transaction will be the transactionally consistent version of the data that existed at the start of the transaction. Parameters.

The transaction can only recognize data modifications that were committed before the start of the transaction. Your best bet would be to raise an exception within B or C - this will cause a rollback to wherever the exception is caught. The read consistency is set at the statement level in a READ WRITE transaction. The only exception to this rule is that read only transactions can perform DDL statements on temporary tables. A read transaction is started by a SELECT statement, and a write transaction is started by statements like CREATE, DELETE, DROP, INSERT, or UPDATE (collectively "write statements").

If the isolation level, read/write mode, or deferrable mode is specified, the new transaction has those characteristics, as if SET TRANSACTION was executed. Stewart Ben (RBAU/EQS4) * Sri, This is a known problem with Postgres 8.0 - there is no support for nested transactions (which occurs when calling functions). It is not permitted to specify both READ WRITE and READ ONLY in the same statement. You only need to place items in the read and write arrays if you wish to override the values from the main array.

A logical snapshot of the database is created at the beginning of the execution of each statement and released at … START TRANSACTION [ transaction_mode [, ...] ] transaction_modeには以下のいずれかが入ります。 ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED } READ WRITE | READ ONLY Compatibility. The rest of the database options for the read and write connections will be merged from the main mysql array. start transaction; start transaction isolation level repeatable read; start transaction read write; start transaction isolation level read committed, read only; start transaction read write, isolation level serializable; see also# commit, rollback « 9.48. show tables 9.50.

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