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Log all statements from a sample of transactions

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This is useful to obtain a view of the different transaction types in an
application, regardless of the durations of the statements each runs.

Author: Adrien Nayrat
Reviewed-by: Masahiko Sawada, Hayato Kuroda, Andres Freund
This commit is contained in:
Alvaro Herrera
2019-04-03 18:43:59 -03:00
parent d8c0bd9fef
commit 799e220346
7 changed files with 60 additions and 3 deletions
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26
doc/src/sgml/config.sgml
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@@ -5871,6 +5871,32 @@ local0.* /var/log/postgresql
</listitem>
</varlistentry>
<varlistentry id="guc-log-transaction-sample-rate" xreflabel="log_transaction_sample_rate">
<term><varname>log_transaction_sample_rate</varname> (<type>real</type>)
<indexterm>
<primary><varname>log_transaction_sample_rate</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Set the fraction of transactions whose statements are all logged,
in addition to statements logged for other reasons. It applies to
each new transaction regardless of its statements' durations.
The default is <literal>0</literal>, meaning not to log statements
from any additional transaction. Setting this to <literal>1</literal>
logs all statements for all transactions.
<varname>log_transaction_sample_rate</varname> is helpful to track a
sample of transaction.
</para>
<note>
<para>
Like all statement-logging options, this option can add significant
overhead.
</para>
</note>
</listitem>
</varlistentry>
</variablelist>
<para>