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Improve EXPLAIN ANALYZE to show the time spent in each trigger when

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executing a statement that fires triggers.  Formerly this time was
included in "Total runtime" but not otherwise accounted for.
As a side benefit, we avoid re-opening relations when firing non-deferred
AFTER triggers, because the trigger code can re-use the main executor's
ResultRelInfo data structure.
This commit is contained in:
Tom Lane
2005-03-25 21:58:00 +00:00
parent 08890b407e
commit adb1a6e95b
16 changed files with 403 additions and 143 deletions
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73
src/backend/commands/explain.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.130 2005/03/20 22:27:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.131 2005/03/25 21:57:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -15,6 +15,7 @@
#include "access/genam.h"
#include "access/heapam.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_type.h"
#include "commands/explain.h"
#include "commands/prepare.h"
@ -272,16 +273,76 @@ ExplainOnePlan(QueryDesc *queryDesc, ExplainStmt *stmt,
}
/*
* Close down the query and free resources; also run any queued
* AFTER triggers. Include time for this in the total runtime.
* If we ran the command, run any AFTER triggers it queued. (Note this
* will not include DEFERRED triggers; since those don't run until end of
* transaction, we can't measure them.) Include into total runtime.
*/
if (stmt->analyze)
{
INSTR_TIME_SET_CURRENT(starttime);
AfterTriggerEndQuery(queryDesc->estate);
totaltime += elapsed_time(&starttime);
}
/* Print info about runtime of triggers */
if (es->printAnalyze)
{
ResultRelInfo *rInfo;
int numrels = queryDesc->estate->es_num_result_relations;
int nr;
rInfo = queryDesc->estate->es_result_relations;
for (nr = 0; nr < numrels; rInfo++, nr++)
{
int nt;
if (!rInfo->ri_TrigDesc)
continue;
for (nt = 0; nt < rInfo->ri_TrigDesc->numtriggers; nt++)
{
Trigger *trig = rInfo->ri_TrigDesc->triggers + nt;
Instrumentation *instr = rInfo->ri_TrigInstrument + nt;
char *conname;
/* Must clean up instrumentation state */
InstrEndLoop(instr);
/*
* We ignore triggers that were never invoked; they likely
* aren't relevant to the current query type.
*/
if (instr->ntuples == 0)
continue;
if (trig->tgisconstraint &&
(conname = GetConstraintNameForTrigger(trig->tgoid)) != NULL)
{
appendStringInfo(str, "Trigger for constraint %s",
conname);
pfree(conname);
}
else
appendStringInfo(str, "Trigger %s", trig->tgname);
if (numrels > 1)
appendStringInfo(str, " on %s",
RelationGetRelationName(rInfo->ri_RelationDesc));
appendStringInfo(str, ": time=%.3f calls=%.0f\n",
1000.0 * instr->total,
instr->ntuples);
}
}
}
/*
* Close down the query and free resources. Include time for this
* in the total runtime (although it should be pretty minimal).
*/
INSTR_TIME_SET_CURRENT(starttime);
ExecutorEnd(queryDesc);
if (stmt->analyze)
AfterTriggerEndQuery();
FreeQueryDesc(queryDesc);
/* We need a CCI just in case query expanded to multiple plans */