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Add example of how to generate the session identifier from pg_stat_activity.

This commit is contained in:
Bruce Momjian 2009-06-03 00:38:34 +00:00
parent ade91586ea
commit 44ead23384
1 changed files with 9 additions and 2 deletions
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11
doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.217 2009/06/02 17:37:55 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.218 2009/06/03 00:38:34 momjian Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -3088,7 +3088,14 @@ local0.* /var/log/postgresql
consisting of two 4-byte hexadecimal numbers (without leading zeros)
separated by a dot. The numbers are the process start time and the
process ID, so <literal>%c</> can also be used as a space saving way
of printing those items.
of printing those items. For example, to generate the session
identifier from <literal>pg_stat_activity</>, use:
<programlisting>
SELECT to_hex(EXTRACT(EPOCH FROM backend_start)::integer) || '.' ||
to_hex(procpid)
FROM pg_stat_activity;
</programlisting>
</para>
<tip>