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Add SHARE UPDATE EXCLUSIVE lock mode, coming soon to a VACUUM near you.
Name chosen per pghackers discussion around 6/22/01.
This commit is contained in:
Tom Lane
parent
8902f49abb
commit
4fe42dfbc3
@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/mvcc.sgml,v 2.15 2001/05/17 21:50:16 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/mvcc.sgml,v 2.16 2001/07/09 22:18:33 tgl Exp $
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-->
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<chapter id="mvcc">
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@ -441,6 +441,25 @@ ERROR: Can't serialize access due to concurrent update
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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ShareUpdateExclusiveLock
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</term>
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<listitem>
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<para>
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Acquired by <command>VACUUM</command> (without <option>FULL</option>)
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and <command>LOCK TABLE</command> table
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for <option>IN SHARE UPDATE EXCLUSIVE MODE</option>
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statements.
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</para>
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<para>
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Conflicts with ShareUpdateExclusiveLock, ShareLock,
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ShareRowExclusiveLock, ExclusiveLock and AccessExclusiveLock modes.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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ShareLock
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@ -454,7 +473,8 @@ ERROR: Can't serialize access due to concurrent update
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</para>
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<para>
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Conflicts with RowExclusiveLock, ShareRowExclusiveLock,
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Conflicts with RowExclusiveLock, ShareUpdateExclusiveLock,
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ShareRowExclusiveLock,
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ExclusiveLock and AccessExclusiveLock modes.
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</para>
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</listitem>
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@ -471,7 +491,8 @@ ERROR: Can't serialize access due to concurrent update
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</para>
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<para>
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Conflicts with RowExclusiveLock, ShareLock, ShareRowExclusiveLock,
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Conflicts with RowExclusiveLock, ShareUpdateExclusiveLock,
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ShareLock, ShareRowExclusiveLock,
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ExclusiveLock and AccessExclusiveLock modes.
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</para>
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</listitem>
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@ -488,7 +509,8 @@ ERROR: Can't serialize access due to concurrent update
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</para>
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<para>
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Conflicts with RowShareLock, RowExclusiveLock, ShareLock,
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Conflicts with RowShareLock, RowExclusiveLock,
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ShareUpdateExclusiveLock, ShareLock,
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ShareRowExclusiveLock, ExclusiveLock and AccessExclusiveLock
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modes.
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</para>
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@ -503,13 +525,13 @@ ERROR: Can't serialize access due to concurrent update
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<para>
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Acquired by <command>ALTER TABLE</command>,
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<command>DROP TABLE</command>,
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<command>VACUUM</command> and <command>LOCK TABLE</command>
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<command>VACUUM FULL</command> and <command>LOCK TABLE</command>
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statements.
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</para>
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<para>
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Conflicts with all modes (AccessShareLock, RowShareLock,
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RowExclusiveLock, ShareLock,
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RowExclusiveLock, ShareUpdateExclusiveLock, ShareLock,
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ShareRowExclusiveLock, ExclusiveLock and AccessExclusiveLock).
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</para>
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</listitem>
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@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/lock.sgml,v 1.23 2000/12/25 23:15:26 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/lock.sgml,v 1.24 2001/07/09 22:18:33 tgl Exp $
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Postgres documentation
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-->
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@ -20,12 +20,16 @@ Postgres documentation
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</refnamediv>
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<refsynopsisdiv>
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<refsynopsisdivinfo>
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<date>1999-07-20</date>
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<date>2001-07-09</date>
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</refsynopsisdivinfo>
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<synopsis>
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LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable>
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LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN [ ROW | ACCESS ] { SHARE | EXCLUSIVE } MODE
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LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EXCLUSIVE MODE
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LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN <replaceable class="PARAMETER">lockmode</replaceable> MODE
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where <replaceable class="PARAMETER">lockmode</replaceable> is one of:
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ACCESS SHARE | ROW SHARE | ROW EXCLUSIVE | SHARE UPDATE EXCLUSIVE |
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SHARE | SHARE ROW EXCLUSIVE | EXCLUSIVE | ACCESS EXCLUSIVE
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</synopsis>
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<refsect2 id="R2-SQL-LOCK-1">
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@ -33,7 +37,6 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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<date>1999-06-09</date>
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</refsect2info>
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<title>
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Inputs
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</title>
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@ -62,7 +65,7 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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This is the least restrictive lock mode. It conflicts only with
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ACCESS EXCLUSIVE mode. It is used to protect a table from being
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modified by concurrent <command>ALTER TABLE</command>,
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<command>DROP TABLE</command> and <command>VACUUM</command>
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<command>DROP TABLE</command> and <command>VACUUM FULL</command>
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commands.
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</para>
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</listitem>
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@ -102,6 +105,25 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>SHARE UPDATE EXCLUSIVE MODE</term>
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<listitem>
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<note>
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<para>
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Automatically acquired by <command>VACUUM</command> (without
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<option>FULL</option>).
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</para>
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</note>
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<para>
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Conflicts with SHARE UPDATE EXCLUSIVE, SHARE, SHARE ROW EXCLUSIVE,
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EXCLUSIVE and
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ACCESS EXCLUSIVE modes. This mode protects a table against
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concurrent schema changes and VACUUMs.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>SHARE MODE</term>
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<listitem>
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@ -113,9 +135,10 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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</note>
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<para>
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Conflicts with ROW EXCLUSIVE, SHARE ROW EXCLUSIVE, EXCLUSIVE and
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Conflicts with ROW EXCLUSIVE, SHARE UPDATE EXCLUSIVE,
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SHARE ROW EXCLUSIVE, EXCLUSIVE and
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ACCESS EXCLUSIVE modes. This mode protects a table against
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concurrent updates.
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concurrent data updates.
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</para>
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</listitem>
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</varlistentry>
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@ -125,14 +148,14 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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<listitem>
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<note>
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<para>
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This is like EXCLUSIVE MODE, but allows SHARE ROW locks
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This is like EXCLUSIVE MODE, but allows ROW SHARE locks
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by others.
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</para>
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</note>
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<para>
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Conflicts with ROW EXCLUSIVE, SHARE, SHARE ROW EXCLUSIVE,
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EXCLUSIVE and ACCESS EXCLUSIVE modes.
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Conflicts with ROW EXCLUSIVE, SHARE UPDATE EXCLUSIVE, SHARE,
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SHARE ROW EXCLUSIVE, EXCLUSIVE and ACCESS EXCLUSIVE modes.
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</para>
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</listitem>
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</varlistentry>
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@ -149,7 +172,8 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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</note>
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<para>
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Conflicts with ROW SHARE, ROW EXCLUSIVE, SHARE, SHARE ROW EXCLUSIVE,
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Conflicts with ROW SHARE, ROW EXCLUSIVE, SHARE UPDATE EXCLUSIVE,
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SHARE, SHARE ROW EXCLUSIVE,
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EXCLUSIVE and ACCESS EXCLUSIVE modes.
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</para>
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</listitem>
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@ -161,9 +185,10 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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<note>
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<para>
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Automatically acquired by <command>ALTER TABLE</command>,
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<command>DROP TABLE</command>, <command>VACUUM</command> statements.
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This is the most restrictive lock mode which conflicts with all other
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lock modes and protects a locked table from any concurrent operations.
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<command>DROP TABLE</command>, <command>VACUUM FULL</command>
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statements.
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This is the most restrictive lock mode which
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protects a locked table from any concurrent operations.
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</para>
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</note>
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@ -174,6 +199,10 @@ LOCK [ TABLE ] <replaceable class="PARAMETER">name</replaceable> IN SHARE ROW EX
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lock mode option).
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</para>
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</note>
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<para>
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Conflicts with all lock modes.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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@ -241,7 +270,11 @@ ERROR <replaceable class="PARAMETER">name</replaceable>: Table does not exist.
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<term>EXCLUSIVE</term>
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<listitem>
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<para>
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Exclusive lock that prevents other locks from being granted.
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An exclusive lock prevents other locks of the same type from being
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granted. (Note: ROW EXCLUSIVE mode does not follow this naming
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convention perfectly, since it is shared at the level of the table;
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it is exclusive only with respect to specific rows that are being
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updated.)
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</para>
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</listitem>
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</varlistentry>
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@ -250,7 +283,8 @@ ERROR <replaceable class="PARAMETER">name</replaceable>: Table does not exist.
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<term>SHARE</term>
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<listitem>
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<para>
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Allows others to share lock. Prevents EXCLUSIVE locks.
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A shared lock allows others to also hold the same type of lock,
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but prevents the corresponding EXCLUSIVE lock from being granted.
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</para>
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</listitem>
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</varlistentry>
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@ -273,13 +307,6 @@ ERROR <replaceable class="PARAMETER">name</replaceable>: Table does not exist.
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</listitem>
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</varlistentry>
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</variablelist>
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<note>
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<para>
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If EXCLUSIVE or SHARE are not specified, EXCLUSIVE is assumed.
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Locks exist for the duration of the transaction.
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</para>
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</note>
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</para>
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<para>
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@ -370,8 +397,8 @@ ERROR <replaceable class="PARAMETER">name</replaceable>: Table does not exist.
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</para>
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<para>
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Except for ACCESS SHARE/EXCLUSIVE lock modes, all other
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<productname>Postgres</productname> lock modes and the
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Except for ACCESS SHARE, ACCESS EXCLUSIVE, and SHARE UPDATE EXCLUSIVE lock
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modes, the <productname>Postgres</productname> lock modes and the
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<command>LOCK TABLE</command> syntax are compatible with those
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present in <productname>Oracle</productname>.
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</para>
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@ -11,7 +11,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.233 2001/06/30 22:03:25 petere Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.234 2001/07/09 22:18:33 tgl Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -153,7 +153,7 @@ static void doNegateFloat(Value *v);
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%type <list> createdb_opt_list, createdb_opt_item
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%type <ival> opt_lock, lock_type
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%type <boolean> opt_lmode, opt_force
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%type <boolean> opt_force
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%type <ival> user_createdb_clause, user_createuser_clause
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%type <str> user_passwd_clause
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@ -3277,18 +3277,18 @@ LockStmt: LOCK_P opt_table relation_name opt_lock
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}
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;
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opt_lock: IN lock_type MODE { $$ = $2; }
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opt_lock: IN lock_type MODE { $$ = $2; }
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| /*EMPTY*/ { $$ = AccessExclusiveLock; }
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;
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lock_type: SHARE ROW EXCLUSIVE { $$ = ShareRowExclusiveLock; }
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| ROW opt_lmode { $$ = ($2? RowShareLock: RowExclusiveLock); }
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| ACCESS opt_lmode { $$ = ($2? AccessShareLock: AccessExclusiveLock); }
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| opt_lmode { $$ = ($1? ShareLock: ExclusiveLock); }
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;
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opt_lmode: SHARE { $$ = TRUE; }
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| EXCLUSIVE { $$ = FALSE; }
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lock_type: ACCESS SHARE { $$ = AccessShareLock; }
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| ROW SHARE { $$ = RowShareLock; }
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| ROW EXCLUSIVE { $$ = RowExclusiveLock; }
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| SHARE UPDATE EXCLUSIVE { $$ = ShareUpdateExclusiveLock; }
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| SHARE { $$ = ShareLock; }
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| SHARE ROW EXCLUSIVE { $$ = ShareRowExclusiveLock; }
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| EXCLUSIVE { $$ = ExclusiveLock; }
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| ACCESS EXCLUSIVE { $$ = AccessExclusiveLock; }
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;
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.48 2001/06/22 00:04:59 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.49 2001/07/09 22:18:33 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -33,25 +33,35 @@ static LOCKMASK LockConflicts[] = {
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(1 << ExclusiveLock) | (1 << AccessExclusiveLock),
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/* RowExclusiveLock */
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(1 << ExclusiveLock) | (1 << ShareRowExclusiveLock) | (1 << ShareLock) |
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(1 << AccessExclusiveLock),
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(1 << ShareLock) | (1 << ShareRowExclusiveLock) |
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(1 << ExclusiveLock) | (1 << AccessExclusiveLock),
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/* ShareUpdateExclusiveLock */
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(1 << ShareUpdateExclusiveLock) |
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(1 << ShareLock) | (1 << ShareRowExclusiveLock) |
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(1 << ExclusiveLock) | (1 << AccessExclusiveLock),
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/* ShareLock */
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(1 << ExclusiveLock) | (1 << ShareRowExclusiveLock) |
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(1 << RowExclusiveLock) | (1 << AccessExclusiveLock),
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(1 << RowExclusiveLock) | (1 << ShareUpdateExclusiveLock) |
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(1 << ShareRowExclusiveLock) |
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(1 << ExclusiveLock) | (1 << AccessExclusiveLock),
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/* ShareRowExclusiveLock */
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(1 << ExclusiveLock) | (1 << ShareRowExclusiveLock) |
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(1 << ShareLock) | (1 << RowExclusiveLock) | (1 << AccessExclusiveLock),
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(1 << RowExclusiveLock) | (1 << ShareUpdateExclusiveLock) |
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(1 << ShareLock) | (1 << ShareRowExclusiveLock) |
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(1 << ExclusiveLock) | (1 << AccessExclusiveLock),
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/* ExclusiveLock */
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(1 << ExclusiveLock) | (1 << ShareRowExclusiveLock) | (1 << ShareLock) |
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(1 << RowExclusiveLock) | (1 << RowShareLock) | (1 << AccessExclusiveLock),
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(1 << RowShareLock) |
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(1 << RowExclusiveLock) | (1 << ShareUpdateExclusiveLock) |
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(1 << ShareLock) | (1 << ShareRowExclusiveLock) |
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(1 << ExclusiveLock) | (1 << AccessExclusiveLock),
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/* AccessExclusiveLock */
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(1 << ExclusiveLock) | (1 << ShareRowExclusiveLock) | (1 << ShareLock) |
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(1 << RowExclusiveLock) | (1 << RowShareLock) |
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(1 << AccessExclusiveLock) | (1 << AccessShareLock)
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(1 << AccessShareLock) | (1 << RowShareLock) |
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(1 << RowExclusiveLock) | (1 << ShareUpdateExclusiveLock) |
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(1 << ShareLock) | (1 << ShareRowExclusiveLock) |
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(1 << ExclusiveLock) | (1 << AccessExclusiveLock)
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};
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@ -63,14 +73,16 @@ static int LockPrios[] = {
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2,
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/* RowExclusiveLock */
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3,
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/* ShareLock */
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/* ShareUpdateExclusiveLock */
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4,
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/* ShareRowExclusiveLock */
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/* ShareLock */
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5,
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/* ExclusiveLock */
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/* ShareRowExclusiveLock */
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6,
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/* ExclusiveLock */
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7,
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/* AccessExclusiveLock */
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7
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8
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};
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LOCKMETHOD LockTableId = (LOCKMETHOD) NULL;
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lock.c,v 1.90 2001/06/27 23:31:39 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lock.c,v 1.91 2001/07/09 22:18:33 tgl Exp $
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*
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* NOTES
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* Outside modules can create a lock table and acquire/release
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@ -58,6 +58,7 @@ static char *lock_mode_names[] =
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"AccessShareLock",
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"RowShareLock",
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"RowExclusiveLock",
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"ShareUpdateExclusiveLock",
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"ShareLock",
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"ShareRowExclusiveLock",
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"ExclusiveLock",
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: lmgr.h,v 1.31 2001/06/22 00:04:59 tgl Exp $
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* $Id: lmgr.h,v 1.32 2001/07/09 22:18:34 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -25,13 +25,14 @@
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#define AccessShareLock 1 /* SELECT */
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#define RowShareLock 2 /* SELECT FOR UPDATE */
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#define RowExclusiveLock 3 /* INSERT, UPDATE, DELETE */
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#define ShareLock 4 /* CREATE INDEX */
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#define ShareRowExclusiveLock 5 /* like EXCLUSIVE MODE, allows
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* SHARE ROW */
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#define ExclusiveLock 6 /* blocks ROW SHARE/SELECT...FOR
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#define ShareUpdateExclusiveLock 4 /* VACUUM (non-FULL) */
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#define ShareLock 5 /* CREATE INDEX */
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#define ShareRowExclusiveLock 6 /* like EXCLUSIVE MODE, but allows
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* ROW SHARE */
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#define ExclusiveLock 7 /* blocks ROW SHARE/SELECT...FOR
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* UPDATE */
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#define AccessExclusiveLock 7 /* ALTER TABLE, DROP TABLE,
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* VACUUM, and unqualified LOCK
|
||||
#define AccessExclusiveLock 8 /* ALTER TABLE, DROP TABLE,
|
||||
* VACUUM FULL, and unqualified LOCK
|
||||
* TABLE */
|
||||
|
||||
/*
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: lock.h,v 1.50 2001/06/27 23:31:39 tgl Exp $
|
||||
* $Id: lock.h,v 1.51 2001/07/09 22:18:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -49,7 +49,7 @@ typedef int LOCKMODE;
|
||||
typedef int LOCKMETHOD;
|
||||
|
||||
/* MAX_LOCKMODES cannot be larger than the # of bits in LOCKMASK */
|
||||
#define MAX_LOCKMODES 8
|
||||
#define MAX_LOCKMODES 10
|
||||
|
||||
/*
|
||||
* MAX_LOCK_METHODS corresponds to the number of spin locks allocated in
|
||||
@ -91,7 +91,7 @@ typedef int LOCKMETHOD;
|
||||
*
|
||||
* prio -- each lockmode has a priority, so, for example, waiting
|
||||
* writers can be given priority over readers (to avoid
|
||||
* starvation).
|
||||
* starvation). XXX this field is not actually used at present!
|
||||
*
|
||||
* masterlock -- synchronizes access to the table
|
||||
*/
|
||||
|
||||
@ -326,7 +326,7 @@ make_name(void)
|
||||
%type <str> createdb_opt_list opt_encoding OptInherit Geometric
|
||||
%type <str> DropdbStmt ClusterStmt grantee RevokeStmt Bit bit
|
||||
%type <str> GrantStmt privileges operation_commalist operation PosAllConst
|
||||
%type <str> opt_cursor opt_lmode ConstraintsSetStmt comment_tg AllConst
|
||||
%type <str> opt_cursor ConstraintsSetStmt comment_tg AllConst
|
||||
%type <str> case_expr when_clause_list case_default case_arg when_clause
|
||||
%type <str> select_clause opt_select_limit select_limit_value ConstraintTimeSpec
|
||||
%type <str> select_offset_value ReindexStmt join_type opt_boolean
|
||||
@ -2440,15 +2440,15 @@ opt_lock: IN lock_type MODE { $$ = cat_str(3, make_str("in"), $2, ma
|
||||
| /*EMPTY*/ { $$ = EMPTY;}
|
||||
;
|
||||
|
||||
lock_type: SHARE ROW EXCLUSIVE { $$ = make_str("share row exclusive"); }
|
||||
| ROW opt_lmode { $$ = cat2_str(make_str("row"), $2);}
|
||||
| ACCESS opt_lmode { $$ = cat2_str(make_str("access"), $2);}
|
||||
| opt_lmode { $$ = $1; }
|
||||
;
|
||||
|
||||
opt_lmode: SHARE { $$ = make_str("share"); }
|
||||
| EXCLUSIVE { $$ = make_str("exclusive"); }
|
||||
;
|
||||
lock_type: ACCESS SHARE { $$ = make_str("access share"); }
|
||||
| ROW SHARE { $$ = make_str("access share"); }
|
||||
| ROW EXCLUSIVE { $$ = make_str("row exclusive"); }
|
||||
| SHARE UPDATE EXCLUSIVE { $$ = make_str("share update exclusive"); }
|
||||
| SHARE { $$ = make_str("share"); }
|
||||
| SHARE ROW EXCLUSIVE { $$ = make_str("share row exclusive"); }
|
||||
| EXCLUSIVE { $$ = make_str("exclusive"); }
|
||||
| ACCESS EXCLUSIVE { $$ = make_str("access exclusive"); }
|
||||
;
|
||||
|
||||
/*****************************************************************************
|
||||
*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user