database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-31 17:02:12 +03:00
Code Activity

Print planning time only in EXPLAIN ANALYZE, not plain EXPLAIN.

Browse Source 
We've gotten enough push-back on that change to make it clear that it
wasn't an especially good idea to do it like that.  Revert plain EXPLAIN
to its previous behavior, but keep the extra output in EXPLAIN ANALYZE.
Per discussion.

Internally, I set this up as a separate flag ExplainState.summary that
controls printing of planning time and execution time.  For now it's
just copied from the ANALYZE option, but we could consider exposing it
to users.
This commit is contained in:
Tom Lane
2014-10-15 18:50:13 -04:00
parent 076d29a1ee
commit 90063a7612
5 changed files with 24 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
doc/src/sgml/ref/explain.sgml
View File

@@ -145,8 +145,8 @@ ROLLBACK;
<para>
Include information on the estimated startup and total cost of each
plan node, as well as the estimated number of rows and the estimated
width of each row. Also, include the time spent planning the query,
if available. This parameter defaults to <literal>TRUE</literal>.
width of each row.
This parameter defaults to <literal>TRUE</literal>.
</para>
</listitem>
</varlistentry>
@@ -291,8 +291,7 @@ EXPLAIN SELECT * FROM foo;
QUERY PLAN
---------------------------------------------------------
Seq Scan on foo (cost=0.00..155.00 rows=10000 width=4)
Planning time: 0.114 ms
(2 rows)
(1 row)
</programlisting>
</para>
@@ -312,8 +311,7 @@ EXPLAIN (FORMAT JSON) SELECT * FROM foo;
"Total Cost": 155.00, +
"Plan Rows": 10000, +
"Plan Width": 4 +
}. +
"Planning Time": 0.114 +
} +
} +
]
(1 row)
@@ -332,8 +330,7 @@ EXPLAIN SELECT * FROM foo WHERE i = 4;
--------------------------------------------------------------
Index Scan using fi on foo (cost=0.00..5.98 rows=1 width=4)
Index Cond: (i = 4)
Planning time: 0.073 ms
(3 rows)
(2 rows)
</programlisting>
</para>
@@ -353,8 +350,7 @@ EXPLAIN (FORMAT YAML) SELECT * FROM foo WHERE i='4';
Total Cost: 5.98 +
Plan Rows: 1 +
Plan Width: 4 +
Index Cond: "(i = 4)" +
Planning Time: 0.073
Index Cond: "(i = 4)"
(1 row)
</programlisting>
@@ -386,7 +382,6 @@ EXPLAIN SELECT sum(i) FROM foo WHERE i &lt; 10;
Aggregate (cost=23.93..23.93 rows=1 width=4)
-&gt; Index Scan using fi on foo (cost=0.00..23.92 rows=6 width=4)
Index Cond: (i &lt; 10)
Planning time: 0.088 ms
(3 rows)
</programlisting>
</para>
@@ -410,7 +405,7 @@ EXPLAIN ANALYZE EXECUTE query(100, 200);
Index Cond: ((id &gt; $1) AND (id &lt; $2))
Planning time: 0.197 ms
Execution time: 0.225 ms
(5 rows)
(6 rows)
</programlisting>
</para>