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Add the option to report WAL usage in EXPLAIN and auto_explain.

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This commit adds a new option WAL similar to existing option BUFFERS in the
EXPLAIN command.  This option allows to include information on WAL record
generation added by commit df3b181499 in EXPLAIN output.

This also allows the WAL usage information to be displayed via
the auto_explain module.  A new parameter auto_explain.log_wal controls
whether WAL usage statistics are printed when an execution plan is logged.
This parameter has no effect unless auto_explain.log_analyze is enabled.

Author: Julien Rouhaud
Reviewed-by: Dilip Kumar and Amit Kapila
Discussion: https://postgr.es/m/CAB-hujrP8ZfUkvL5OYETipQwA=e3n7oqHFU=4ZLxWS_Cza3kQQ@mail.gmail.com
This commit is contained in:
Amit Kapila
2020-04-06 08:02:15 +05:30
parent a40caf5f86
commit 33e05f89c5
6 changed files with 124 additions and 6 deletions
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3
src/include/commands/explain.h
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@@ -42,6 +42,7 @@ typedef struct ExplainState
bool analyze; /* print actual times */
bool costs; /* print estimated costs */
bool buffers; /* print buffer usage */
bool wal; /* print WAL usage */
bool timing; /* print detailed node timing */
bool summary; /* print total planning and execution timing */
bool settings; /* print modified settings */
@@ -111,6 +112,8 @@ extern void ExplainPropertyText(const char *qlabel, const char *value,
ExplainState *es);
extern void ExplainPropertyInteger(const char *qlabel, const char *unit,
int64 value, ExplainState *es);
extern void ExplainPropertyUInteger(const char *qlabel, const char *unit,
uint64 value, ExplainState *es);
extern void ExplainPropertyFloat(const char *qlabel, const char *unit,
double value, int ndigits, ExplainState *es);
extern void ExplainPropertyBool(const char *qlabel, bool value,