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doc: Add logical replication to comparison matrix
Author: Steve Singer <steve@ssinger.info>
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doc/src/sgml/high-availability.sgml

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</varlistentry>
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<varlistentry>
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<term>File System (Block-Device) Replication</term>
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<term>File System (Block Device) Replication</term>
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<listitem>
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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>Logical Replication</term>
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<listitem>
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<para>
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Logical replication allows a database server to send a stream of data
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modifications to another server. <productname>PostgreSQL</productname>
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logical replication constructs a stream of logical data modifications
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from the WAL. Logical replication allows the data changes from
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individual tables to be replicated. Logical replication doesn't require
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a particular server to be designated as a master or a replica but allows
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data to flow in multiple directions. For more information on logical
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replication, see <xref linkend="logical-replication">. Through the
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logical decoding interface (<xref linkend="logicaldecoding">),
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third-party extensions can also provide similar functionality.
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</para>
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</listitem>
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</varlistentry>
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<term>Trigger-Based Master-Standby Replication</term>
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<listitem>
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<entry>Shared Disk Failover</entry>
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<entry>File System Replication</entry>
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<entry>Write-Ahead Log Shipping</entry>
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<entry>Logical Replication</entry>
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<entry>Trigger-Based Master-Standby Replication</entry>
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<entry>Statement-Based Replication Middleware</entry>
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<entry>Asynchronous Multimaster Replication</entry>
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<tbody>
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<row>
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<entry>Most Common Implementation</entry>
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<entry>Most common implementations</entry>
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<entry align="center">NAS</entry>
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<entry align="center">DRBD</entry>
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<entry align="center">Streaming Repl.</entry>
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<entry align="center">Slony</entry>
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<entry align="center">built-in streaming replication</entry>
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<entry align="center">built-in logical replication, pglogical</entry>
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<entry align="center">Londiste, Slony</entry>
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<entry align="center">pgpool-II</entry>
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<entry align="center">Bucardo</entry>
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<entry align="center"></entry>
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</row>
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<row>
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<entry>Communication Method</entry>
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<entry>Communication method</entry>
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<entry align="center">shared disk</entry>
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<entry align="center">disk blocks</entry>
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<entry align="center">WAL</entry>
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<entry align="center">logical decoding</entry>
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<entry align="center">table rows</entry>
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<entry align="center">SQL</entry>
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<entry align="center">table rows</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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</row>
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<row>
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<entry>Allows multiple master servers</entry>
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<entry align="center"></entry>
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<entry align="center"></entry>
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<entry align="center"></entry>
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<entry align="center">&bull;</entry>
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<entry align="center"></entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center"></entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center"></entry>
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<entry align="center">with sync off</entry>
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<entry align="center">with sync off</entry>
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<entry align="center">&bull;</entry>
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<entry align="center"></entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">with sync on</entry>
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<entry align="center">with sync on</entry>
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<entry align="center"></entry>
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<entry align="center">&bull;</entry>
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<entry align="center"></entry>
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<entry align="center">&bull;</entry>
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</row>
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<row>
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<entry>Standby accept read-only queries</entry>
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<entry>Replicas accept read-only queries</entry>
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<entry align="center"></entry>
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<entry align="center"></entry>
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<entry align="center">with hot</entry>
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<entry align="center">with hot standby</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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<entry align="center">&bull;</entry>
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