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>PostgreSQL 8.4.20 Documentation</TH
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><H1
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NAME="SQL-START-TRANSACTION"
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>START TRANSACTION</H1
><DIV
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><A
NAME="AEN66393"
></A
><H2
>Name</H2
>START TRANSACTION -- start a transaction block</DIV
><A
NAME="AEN66396"
></A
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN66398"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>START TRANSACTION [ <TT
CLASS="REPLACEABLE"
><I
>transaction_mode</I
></TT
> [, ...] ]
where <TT
CLASS="REPLACEABLE"
><I
>transaction_mode</I
></TT
> is one of:
ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED }
READ WRITE | READ ONLY</PRE
></DIV
><DIV
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><A
NAME="AEN66402"
></A
><H2
>Description</H2
><P
> This command begins a new transaction block. If the isolation level or
read/write mode is specified, the new transaction has those
characteristics, as if <A
HREF="sql-set-transaction.html"
><I
>SET TRANSACTION</I
></A
> was executed. This is the same
as the <A
HREF="sql-begin.html"
><I
>BEGIN</I
></A
> command.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN66407"
></A
><H2
>Parameters</H2
><P
> Refer to <A
HREF="sql-set-transaction.html"
><I
>SET TRANSACTION</I
></A
> for information on the meaning
of the parameters to this statement.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN66411"
></A
><H2
>Compatibility</H2
><P
> In the standard, it is not necessary to issue <TT
CLASS="COMMAND"
>START TRANSACTION</TT
>
to start a transaction block: any SQL command implicitly begins a block.
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>'s behavior can be seen as implicitly
issuing a <TT
CLASS="COMMAND"
>COMMIT</TT
> after each command that does not
follow <TT
CLASS="COMMAND"
>START TRANSACTION</TT
> (or <TT
CLASS="COMMAND"
>BEGIN</TT
>),
and it is therefore often called <SPAN
CLASS="QUOTE"
>"autocommit"</SPAN
>.
Other relational database systems might offer an autocommit feature
as a convenience.
</P
><P
> The SQL standard requires commas between successive <TT
CLASS="REPLACEABLE"
><I
>transaction_modes</I
></TT
>, but for historical
reasons <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> allows the commas to be
omitted.
</P
><P
> See also the compatibility section of <A
HREF="sql-set-transaction.html"
><I
>SET TRANSACTION</I
></A
>.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN66425"
></A
><H2
>See Also</H2
><A
HREF="sql-begin.html"
><I
>BEGIN</I
></A
>, <A
HREF="sql-commit.html"
><I
>COMMIT</I
></A
>, <A
HREF="sql-rollback.html"
><I
>ROLLBACK</I
></A
>, <A
HREF="sql-savepoint.html"
><I
>SAVEPOINT</I
></A
>, <A
HREF="sql-set-transaction.html"
><I
>SET TRANSACTION</I
></A
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>
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