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Fix bogus markup.

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REL8_2_STABLE
Tom Lane 19 years ago
parent f2aad31424
commit c59487cfb3
1 changed files with 31 additions and 30 deletions
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  1. 61
      doc/src/sgml/ddl.sgml

61
doc/src/sgml/ddl.sgml
Unescape View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.62 2006/09/20 01:20:38 neilc Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.63 2006/09/20 21:30:20 tgl Exp $ -->
<chapter id="ddl">
<title>Data Definition</title>
@ -2478,20 +2478,20 @@ CREATE TABLE measurement_y2006m01 ( ) INHERITS (measurement);
<programlisting>
CREATE TABLE measurement_y2004m02 (
CHECK ( logdate >= DATE '2004-02-01' AND logdate < DATE '2004-03-01' )
CHECK ( logdate &gt;= DATE '2004-02-01' AND logdate &lt; DATE '2004-03-01' )
) INHERITS (measurement);
CREATE TABLE measurement_y2004m03 (
CHECK ( logdate >= DATE '2004-03-01' AND logdate < DATE '2004-04-01' )
CHECK ( logdate &gt;= DATE '2004-03-01' AND logdate &lt; DATE '2004-04-01' )
) INHERITS (measurement);
...
CREATE TABLE measurement_y2005m11 (
CHECK ( logdate >= DATE '2005-11-01' AND logdate < DATE '2005-12-01' )
CHECK ( logdate &gt;= DATE '2005-11-01' AND logdate &lt; DATE '2005-12-01' )
) INHERITS (measurement);
CREATE TABLE measurement_y2005m12 (
CHECK ( logdate >= DATE '2005-12-01' AND logdate < DATE '2006-01-01' )
CHECK ( logdate &gt;= DATE '2005-12-01' AND logdate &lt; DATE '2006-01-01' )
) INHERITS (measurement);
CREATE TABLE measurement_y2006m01 (
CHECK ( logdate >= DATE '2006-01-01' AND logdate < DATE '2006-02-01' )
CHECK ( logdate &gt;= DATE '2006-01-01' AND logdate &lt; DATE '2006-02-01' )
) INHERITS (measurement);
</programlisting>
</para>
@ -2538,7 +2538,7 @@ DO INSTEAD
<programlisting>
CREATE RULE measurement_insert_y2004m02 AS
ON INSERT TO measurement WHERE
( logdate >= DATE '2004-02-01' AND logdate < DATE '2004-03-01' )
( logdate &gt;= DATE '2004-02-01' AND logdate &lt; DATE '2004-03-01' )
DO INSTEAD
INSERT INTO measurement_y2004m02 VALUES ( NEW.city_id,
NEW.logdate,
@ -2547,7 +2547,7 @@ DO INSTEAD
...
CREATE RULE measurement_insert_y2005m12 AS
ON INSERT TO measurement WHERE
( logdate >= DATE '2005-12-01' AND logdate < DATE '2006-01-01' )
( logdate &gt;= DATE '2005-12-01' AND logdate &lt; DATE '2006-01-01' )
DO INSTEAD
INSERT INTO measurement_y2005m12 VALUES ( NEW.city_id,
NEW.logdate,
@ -2555,7 +2555,7 @@ DO INSTEAD
NEW.unitsales );
CREATE RULE measurement_insert_y2006m01 AS
ON INSERT TO measurement WHERE
( logdate >= DATE '2006-01-01' AND logdate < DATE '2006-02-01' )
( logdate &gt;= DATE '2006-01-01' AND logdate &lt; DATE '2006-02-01' )
DO INSTEAD
INSERT INTO measurement_y2006m01 VALUES ( NEW.city_id,
NEW.logdate,
@ -2577,6 +2577,7 @@ DO INSTEAD
creating a new partition each month, so it may be wise to write a
script that generates the required DDL automatically.
</para>
</sect2>
<sect2 id="ddl-partitioning-managing-partitions">
<title>Managing Partitions</title>
@ -2624,7 +2625,7 @@ ALTER TABLE measurement_y2003mm02 NO INHERIT measurement;
<programlisting>
CREATE TABLE measurement_y2006m02 (
CHECK ( logdate >= DATE '2006-02-01' AND logdate < DATE '2006-03-01' )
CHECK ( logdate &gt;= DATE '2006-02-01' AND logdate &lt; DATE '2006-03-01' )
) INHERITS (measurement);
</programlisting>
@ -2637,7 +2638,7 @@ CREATE TABLE measurement_y2006m02 (
CREATE TABLE measurement_y2006m02 (LIKE measurement INCLUDING DEFAULTS INCLUDING CONSTRAINTS);
\COPY measurement_y2006m02 FROM 'measurement_y2006m02'
UPDATE ... ;
ALTER TABLE measurement_y2006m02 ADD CONSTRAINT y2006m02 CHECK ( logdate >= DATE '2006-02-01' AND logdate < DATE '2006-03-01' );
ALTER TABLE measurement_y2006m02 ADD CONSTRAINT y2006m02 CHECK ( logdate &gt;= DATE '2006-02-01' AND logdate &lt; DATE '2006-03-01' );
ALTER TABLE measurement_y2006m02 INHERIT measurement;
</programlisting>
</para>
@ -2717,7 +2718,7 @@ UNION ALL SELECT * FROM measurement_y2006m01;
<programlisting>
SET constraint_exclusion = on;
SELECT count(*) FROM measurement WHERE logdate >= DATE '2006-01-01';
SELECT count(*) FROM measurement WHERE logdate &gt;= DATE '2006-01-01';
</programlisting>
Without constraint exclusion, the above query would scan each of
@ -2736,23 +2737,23 @@ SELECT count(*) FROM measurement WHERE logdate >= DATE '2006-01-01';
<programlisting>
SET constraint_exclusion = off;
EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2006-01-01';
EXPLAIN SELECT count(*) FROM measurement WHERE logdate &gt;= DATE '2006-01-01';
QUERY PLAN
-----------------------------------------------------------------------------------------------
Aggregate (cost=158.66..158.68 rows=1 width=0)
-> Append (cost=0.00..151.88 rows=2715 width=0)
-> Seq Scan on measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate >= '2006-01-01'::date)
-> Seq Scan on measurement_y2004m02 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate >= '2006-01-01'::date)
-> Seq Scan on measurement_y2004m03 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate >= '2006-01-01'::date)
-&gt; Append (cost=0.00..151.88 rows=2715 width=0)
-&gt; Seq Scan on measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate &gt;= '2006-01-01'::date)
-&gt; Seq Scan on measurement_y2004m02 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate &gt;= '2006-01-01'::date)
-&gt; Seq Scan on measurement_y2004m03 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate &gt;= '2006-01-01'::date)
...
-> Seq Scan on measurement_y2005m12 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate >= '2006-01-01'::date)
-> Seq Scan on measurement_y2006m01 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate >= '2006-01-01'::date)
-&gt; Seq Scan on measurement_y2005m12 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate &gt;= '2006-01-01'::date)
-&gt; Seq Scan on measurement_y2006m01 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate &gt;= '2006-01-01'::date)
</programlisting>
Some or all of the partitions might use index scans instead of
@ -2763,15 +2764,15 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2006-01-01';
<programlisting>
SET constraint_exclusion = on;
EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2006-01-01';
EXPLAIN SELECT count(*) FROM measurement WHERE logdate &gt;= DATE '2006-01-01';
QUERY PLAN
-----------------------------------------------------------------------------------------------
Aggregate (cost=63.47..63.48 rows=1 width=0)
-> Append (cost=0.00..60.75 rows=1086 width=0)
-> Seq Scan on measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate >= '2006-01-01'::date)
-> Seq Scan on measurement_y2006m01 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate >= '2006-01-01'::date)
-&gt; Append (cost=0.00..60.75 rows=1086 width=0)
-&gt; Seq Scan on measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate &gt;= '2006-01-01'::date)
-&gt; Seq Scan on measurement_y2006m01 measurement (cost=0.00..30.38 rows=543 width=0)
Filter: (logdate &gt;= '2006-01-01'::date)
</programlisting>
</para>

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