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NAME="VIEW-PG-PREPARED-XACTS"
>45.60. <TT
CLASS="STRUCTNAME"
>pg_prepared_xacts</TT
></A
></H1
><P
> The view <TT
CLASS="STRUCTNAME"
>pg_prepared_xacts</TT
> displays
information about transactions that are currently prepared for two-phase
commit (see <A
HREF="sql-prepare-transaction.html"
>PREPARE TRANSACTION</A
> for details).
</P
><P
> <TT
CLASS="STRUCTNAME"
>pg_prepared_xacts</TT
> contains one row per prepared
transaction. An entry is removed when the transaction is committed or
rolled back.
</P
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><B
>Table 45-61. <TT
CLASS="STRUCTNAME"
>pg_prepared_xacts</TT
> Columns</B
></P
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><TH
>Name</TH
><TH
>Type</TH
><TH
>References</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>transaction</TT
></TD
><TD
><TT
CLASS="TYPE"
>xid</TT
></TD
><TD
> </TD
><TD
> Numeric transaction identifier of the prepared transaction
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>gid</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
> </TD
><TD
> Global transaction identifier that was assigned to the transaction
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>prepared</TT
></TD
><TD
><TT
CLASS="TYPE"
>timestamp with time zone</TT
></TD
><TD
> </TD
><TD
> Time at which the transaction was prepared for commit
</TD
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><TT
CLASS="STRUCTFIELD"
>owner</TT
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CLASS="TYPE"
>name</TT
></TD
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><TT
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><A
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><TT
CLASS="STRUCTNAME"
>pg_authid</TT
></A
>.rolname</TT
></TD
><TD
> Name of the user that executed the transaction
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>database</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-database.html"
><TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
>.datname</TT
></TD
><TD
> Name of the database in which the transaction was executed
</TD
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><P
> When the <TT
CLASS="STRUCTNAME"
>pg_prepared_xacts</TT
> view is accessed, the
internal transaction manager data structures are momentarily locked, and
a copy is made for the view to display. This ensures that the
view produces a consistent set of results, while not blocking
normal operations longer than necessary. Nonetheless
there could be some impact on database performance if this view is
frequently accessed.
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