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Shell Programming and Scripting
Splitting a file based on two patterns
Post 302312718 by devtakh on Sunday 3rd of May 2009 01:53:26 AM
05-03-2009
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LEARN ABOUT REDHAT
start_transaction
START
TRANSACTION(7) SQL Commands START TRANSACTION(7) NAME
START TRANSACTION - start a transaction block SYNOPSIS
START TRANSACTION [ ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE } ] INPUTS None. OUTPUTS START TRANSACTION Message returned if successful. WARNING: BEGIN: already a transaction in progress If there is already a transaction in progress when the command is issued. DESCRIPTION
This command begins a new transaction. If the isolation level is specified, the new transaction has that isolation level. In all other respects, the behavior of this command is identical to the BEGIN [begin(7)] command. NOTES
The isolation level of a transaction can also be set with the SET TRANSACTION [set_transaction(7)] command. If no isolation level is speci- fied, the default isolation level is used. COMPATIBILITY
SQL99 SERIALIZABLE is the default isolation level in SQL99, but it is not the usual default in PostgreSQL: the factory default setting is READ COMMITTED. PostgreSQL does not provide the isolation levels READ UNCOMMITTED and REPEATABLE READ. Because of lack of predicate locking, the SERIALIZABLE level is not truly serializable. See the User's Guide for details. In SQL99 this statement can specify two other properties of the new transaction: whether the transaction is read-only and the size of the diagnostics area. Neither of these concepts are currently supported in PostgreSQL. SQL - Language Statements 2002-07-26 START TRANSACTION(7)