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Minor copy-editing.
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‎doc/src/sgml/mvcc.sgml

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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/mvcc.sgml,v 2.22 2002/01/20 22:19:56 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/mvcc.sgml,v 2.23 2002/02/18 16:13:10 tgl Exp $
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-->
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<chapter id="mvcc">
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<para>
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The main difference between multiversion and lock models is that
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in MVCC locks acquired for querying (reading) data don't conflict
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with locks acquired for writing data and so reading never blocks
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with locks acquired for writing data, and so reading never blocks
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writing and writing never blocks reading.
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</para>
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</sect1>
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<para>
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Acquired by <command>SELECT FOR UPDATE</command>
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and <command>LOCK TABLE</command>
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for <option>IN ROW SHARE MODE</option> statements.
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<option>IN ROW SHARE MODE</option> statements.
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</para>
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<para>
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<para>
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Acquired by <command>UPDATE</command>, <command>DELETE</command>,
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<command>INSERT</command> and <command>LOCK TABLE</command>
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for <option>IN ROW EXCLUSIVE MODE</option> statements.
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<option>IN ROW EXCLUSIVE MODE</option> statements.
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</para>
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<para>
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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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and <command>LOCK TABLE</command>
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<option>IN SHARE UPDATE EXCLUSIVE MODE</option>
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statements.
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</para>
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<listitem>
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<para>
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Acquired by <command>CREATE INDEX</command>
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and <command>LOCK TABLE</command> table
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for <option>IN SHARE MODE</option>
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and <command>LOCK TABLE</command>
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<option>IN SHARE MODE</option>
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statements.
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</para>
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</term>
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<listitem>
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<para>
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Acquired by <command>LOCK TABLE</command> for
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Acquired by <command>LOCK TABLE</command>
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<option>IN SHARE ROW EXCLUSIVE MODE</option> statements.
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</para>
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</term>
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<listitem>
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<para>
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Acquired by <command>LOCK TABLE</command> table
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for <option>IN EXCLUSIVE MODE</option> statements.
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Acquired by <command>LOCK TABLE</command>
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<option>IN EXCLUSIVE MODE</option> statements.
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</para>
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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 FULL</command> and <command>LOCK TABLE</command>
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statements.
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<option>IN ACCESS EXCLUSIVE MODE</option> (or plain
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<command>LOCK TABLE</command>) statements.
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</para>
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<para>

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