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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2005-04-21 19:18:13 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2005-04-21 19:18:13 +0000 |
| commit | 14c7fba3f7d0769d8a063dea2854693f35535f6a (patch) | |
| tree | 51b519e88e8092e6fc9cdd6bf50dbff872bc6fa6 /doc/src | |
| parent | c6221db3c0f7049b804391d59aeadcfbd1f51800 (diff) | |
| download | postgresql-14c7fba3f7d0769d8a063dea2854693f35535f6a.tar.gz postgresql-14c7fba3f7d0769d8a063dea2854693f35535f6a.zip | |
Rethink original decision to use AND/OR Expr nodes to represent bitmap
logic operations during planning. Seems cleaner to create two new Path
node types, instead --- this avoids duplication of cost-estimation code.
Also, create an enable_bitmapscan GUC parameter to control use of bitmap
plans.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/runtime.sgml | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml index e5567abf279..72bc1ff17e3 100644 --- a/doc/src/sgml/runtime.sgml +++ b/doc/src/sgml/runtime.sgml @@ -1,5 +1,5 @@ <!-- -$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.313 2005/04/08 00:59:57 neilc Exp $ +$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.314 2005/04/21 19:18:12 tgl Exp $ --> <chapter Id="runtime"> @@ -1768,6 +1768,22 @@ archive_command = 'copy "%p" /mnt/server/archivedir/"%f"' # Windows </para> <variablelist> + <varlistentry id="guc-enable-bitmapscan" xreflabel="enable_bitmapscan"> + <term><varname>enable_bitmapscan</varname> (<type>boolean</type>)</term> + <indexterm> + <primary>bitmap scan</primary> + </indexterm> + <indexterm> + <primary><varname>enable_bitmapscan</> configuration parameter</primary> + </indexterm> + <listitem> + <para> + Enables or disables the query planner's use of bitmap-scan plan + types. The default is on. + </para> + </listitem> + </varlistentry> + <varlistentry id="guc-enable-hashagg" xreflabel="enable_hashagg"> <term><varname>enable_hashagg</varname> (<type>boolean</type>)</term> <indexterm> @@ -4094,7 +4110,7 @@ plruby.bar = true # generates error, unknown class name <row> <entry> - <option>-fi</option>, <option>-fh</option>, + <option>-fb</option>, <option>-fh</option>, <option>-fi</option>, <option>-fm</option>, <option>-fn</option>, <option>-fs</option>, <option>-ft</option><footnote id="fn.runtime-config-short"> @@ -4111,8 +4127,9 @@ $ <userinput>postmaster -o '-S 1024 -s'</userinput> </footnote> </entry> <entry> - <literal>enable_indexscan = off</>, + <literal>enable_bitmapscan = off</>, <literal>enable_hashjoin = off</>, + <literal>enable_indexscan = off</>, <literal>enable_mergejoin = off</>, <literal>enable_nestloop = off</>, <literal>enable_seqscan = off</>, |