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><H1
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NAME="SQL-START-TRANSACTION"
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>START TRANSACTION</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN79287"
></A
><H2
>Name</H2
>START TRANSACTION&nbsp;--&nbsp;start a transaction block</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN79292"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>START TRANSACTION [ <TT
CLASS="REPLACEABLE"
><I
>transaction_mode</I
></TT
> [, ...] ]

<SPAN
CLASS="phrase"
><SPAN
CLASS="PHRASE"
>where <TT
CLASS="REPLACEABLE"
><I
>transaction_mode</I
></TT
> is one of:</SPAN
></SPAN
>

    ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED }
    READ WRITE | READ ONLY
    [ NOT ] DEFERRABLE</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79297"
></A
><H2
>Description</H2
><P
>   This command begins a new transaction block. If the isolation level,
   read/write mode, or deferrable mode is specified, the new transaction has those
   characteristics, as if <A
HREF="sql-set-transaction.html"
>SET TRANSACTION</A
> was executed. This is the same
   as the <A
HREF="sql-begin.html"
>BEGIN</A
> command.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79302"
></A
><H2
>Parameters</H2
><P
>   Refer to <A
HREF="sql-set-transaction.html"
>SET TRANSACTION</A
> for information on the meaning
   of the parameters to this statement.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79306"
></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 <TT
CLASS="LITERAL"
>DEFERRABLE</TT
>
   <TT
CLASS="REPLACEABLE"
><I
>transaction_mode</I
></TT
>
   is a <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> language extension.
  </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"
>SET TRANSACTION</A
>.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79324"
></A
><H2
>See Also</H2
><A
HREF="sql-begin.html"
>BEGIN</A
>, <A
HREF="sql-commit.html"
>COMMIT</A
>, <A
HREF="sql-rollback.html"
>ROLLBACK</A
>, <A
HREF="sql-savepoint.html"
>SAVEPOINT</A
>, <A
HREF="sql-set-transaction.html"
>SET TRANSACTION</A
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