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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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13
src/backend/utils/misc/guc.c
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@ -510,6 +510,7 @@ int client_min_messages = NOTICE;
int log_min_duration_statement = -1;
int log_temp_files = -1;
double log_statement_sample_rate = 1.0;
double log_xact_sample_rate = 0;
int trace_recovery_messages = LOG;
int temp_file_limit = -1;
@ -3386,6 +3387,18 @@ static struct config_real ConfigureNamesReal[] =
NULL, NULL, NULL
},
{
{"log_transaction_sample_rate", PGC_SUSET, LOGGING_WHEN,
gettext_noop("Set the fraction of transactions to log for new transactions."),
gettext_noop("Logs all statements from a fraction of transactions. "
"Use a value between 0.0 (never log) and 1.0 (log all "
"statements for all transactions).")
},
&log_xact_sample_rate,
0.0, 0.0, 1.0,
NULL, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0.0, 0.0, 0.0, NULL, NULL, NULL