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Make EXPLAIN (BUFFERS) track blocks dirtied, as well as those written.

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Also expose the new counters through pg_stat_statements.

Patch by me.  Review by Fujii Masao and Greg Smith.
This commit is contained in:
Robert Haas
2012-02-22 20:33:05 -05:00
parent f74f9a277c
commit 2254367435
12 changed files with 148 additions and 10 deletions
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16
src/backend/commands/explain.c
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@ -1183,12 +1183,14 @@ ExplainNode(PlanState *planstate, List *ancestors,
{
bool has_shared = (usage->shared_blks_hit > 0 ||
usage->shared_blks_read > 0 ||
usage->shared_blks_written);
usage->shared_blks_dirtied > 0 ||
usage->shared_blks_written > 0);
bool has_local = (usage->local_blks_hit > 0 ||
usage->local_blks_read > 0 ||
usage->local_blks_written);
usage->local_blks_dirtied > 0 ||
usage->local_blks_written > 0);
bool has_temp = (usage->temp_blks_read > 0 ||
usage->temp_blks_written);
usage->temp_blks_written > 0);
/* Show only positive counter values. */
if (has_shared || has_local || has_temp)
@ -1205,6 +1207,9 @@ ExplainNode(PlanState *planstate, List *ancestors,
if (usage->shared_blks_read > 0)
appendStringInfo(es->str, " read=%ld",
usage->shared_blks_read);
if (usage->shared_blks_dirtied > 0)
appendStringInfo(es->str, " dirtied=%ld",
usage->shared_blks_dirtied);
if (usage->shared_blks_written > 0)
appendStringInfo(es->str, " written=%ld",
usage->shared_blks_written);
@ -1220,6 +1225,9 @@ ExplainNode(PlanState *planstate, List *ancestors,
if (usage->local_blks_read > 0)
appendStringInfo(es->str, " read=%ld",
usage->local_blks_read);
if (usage->local_blks_dirtied > 0)
appendStringInfo(es->str, " dirtied=%ld",
usage->local_blks_dirtied);
if (usage->local_blks_written > 0)
appendStringInfo(es->str, " written=%ld",
usage->local_blks_written);
@ -1243,9 +1251,11 @@ ExplainNode(PlanState *planstate, List *ancestors,
{
ExplainPropertyLong("Shared Hit Blocks", usage->shared_blks_hit, es);
ExplainPropertyLong("Shared Read Blocks", usage->shared_blks_read, es);
ExplainPropertyLong("Shared Dirtied Blocks", usage->shared_blks_dirtied, es);
ExplainPropertyLong("Shared Written Blocks", usage->shared_blks_written, es);
ExplainPropertyLong("Local Hit Blocks", usage->local_blks_hit, es);
ExplainPropertyLong("Local Read Blocks", usage->local_blks_read, es);
ExplainPropertyLong("Local Dirtied Blocks", usage->local_blks_dirtied, es);
ExplainPropertyLong("Local Written Blocks", usage->local_blks_written, es);
ExplainPropertyLong("Temp Read Blocks", usage->temp_blks_read, es);
ExplainPropertyLong("Temp Written Blocks", usage->temp_blks_written, es);