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Add log_statement_sample_rate parameter
This allows to set a lower log_min_duration_statement value without incurring excessive log traffic (which reduces performance). This can be useful to analyze workloads with lots of short queries. Author: Adrien Nayrat Reviewed-by: David Rowley, Vik Fearing Discussion: https://postgr.es/m/c30ee535-ee1e-db9f-fa97-146b9f62caed@anayrat.info
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@ -486,6 +486,7 @@ int log_min_messages = WARNING;
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int client_min_messages = NOTICE;
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int log_min_duration_statement = -1;
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int log_temp_files = -1;
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double log_statement_sample_rate = 1.0;
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int trace_recovery_messages = LOG;
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int temp_file_limit = -1;
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@ -2642,7 +2643,8 @@ static struct config_int ConfigureNamesInt[] =
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{"log_min_duration_statement", PGC_SUSET, LOGGING_WHEN,
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gettext_noop("Sets the minimum execution time above which "
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"statements will be logged."),
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gettext_noop("Zero prints all queries. -1 turns this feature off."),
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gettext_noop("Zero prints all queries, subject to log_statement_sample_rate. "
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"-1 turns this feature off."),
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GUC_UNIT_MS
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},
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&log_min_duration_statement,
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@ -3319,6 +3321,17 @@ static struct config_real ConfigureNamesReal[] =
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NULL, NULL, NULL
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},
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{
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{"log_statement_sample_rate", PGC_SUSET, LOGGING_WHEN,
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gettext_noop("Fraction of statements over log_min_duration_statement to log."),
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gettext_noop("If you only want a sample, use a value between 0 (never "
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"log) and 1.0 (always log).")
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},
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&log_statement_sample_rate,
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1.0, 0.0, 1.0,
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NULL, NULL, NULL
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},
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/* End-of-list marker */
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{
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{NULL, 0, 0, NULL, NULL}, NULL, 0.0, 0.0, 0.0, NULL, NULL, NULL
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