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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You only need WAL files from your last backup. I backup my 8.4 database daily and just depending on the database usage on how many WAL files are created in
a day. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Wolf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> pgpool-general-bounces@pgpool.net [mailto:pgpool-general-bounces@pgpool.net]
<b>On Behalf Of </b>Daniele Di Vito<br>
<b>Sent:</b> Tuesday, April 09, 2013 11:56 AM<br>
<b>To:</b> pgpool-general@pgpool.net<br>
<b>Subject:</b> [pgpool-general: 1586] WAL files for online recovery.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi,<o:p></o:p></p>
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<p class="MsoNormal">I'm using pgpool-II 3.2.3 in recovery mode with 2 backend node cause my aim is to have a real-time replication of the primary database (bldlam server in the example is the primary and devlam0 is the backup server).<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I do not use the streaming replication mode cause I'm using the 8.3 postgresql version.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Pgpool is working fine and i tested many times the online recovery using a few WAL files (10-15) and all seems to be working fine but I have a doubt and I would like to avoid any trouble in future.<o:p></o:p></p>
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<p class="MsoNormal">Anyone knows if there is a way to know how many WAL files are needed to complete an online recovery after a node failover?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I ask it cause the performances of the server I use are really limited and if it's possible I would prefer not to archive all the wall files.<o:p></o:p></p>
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<p class="MsoNormal"><br>
I suppose that WAL files created after "select pg_start_backup('pgpool-recovery');" can be enough<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">this is what my 1st and 2nd stage commands do:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">1st stage<br>
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#! /bin/sh<br>
##let's begin recovery mode<br>
/usr/local/pgsql-test/bin/psql -p 5445 -c "select pg_start_backup('pgpool-recovery');" postgres<br>
#let's set the restore command<br>
echo "restore_command = 'cp /home/postgres/exchange_bldlam/wal/%f %p'" > /usr/local/pgsql-test/data/recovery.conf<br>
echo "compressing base folder"<br>
#tar -C /usr/local/pgsql-test/data -zcf pgsql.tar.gz base global pg_clog pg_multixact pg_subtrans pg_tblspc pg_twophase pg_xlog recovery.conf<br>
tar -cvf pgsql.tar.gz -C /usr/local/pgsql-test/data base global pg_clog pg_multixact pg_subtrans pg_tblspc pg_twophase pg_xlog recovery.conf<br>
echo "stopping backup mode"<br>
/usr/local/pgsql-test/bin/psql -p 5445 -c "select pg_stop_backup();" postgres<br>
echo "sending base data to devlam0"<br>
scp pgsql.tar.gz devlam0:/usr/local/bldlam/pgsql/data<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">2nd stage <br>
<br>
echo "executing pg_switch_xlog"<br>
/usr/local/pgsql-test/bin/psql -p 5445 -c "SELECT pg_switch_xlog();" postgres<br>
echo "compressing wal files to send"<br>
cd /usr/local/pgsql-test/archive_wal <br>
tar -cvf wal.tar.gz -C /usr/local/pgsql-test/archive_wal *<br>
#inviamoli all'atro server pnella cartella di exchange<br>
echo "sending wal archive to devlam0"<br>
rsync /usr/local/pgsql-test/archive_wal/wal.tar.gz <a href="mailto:postgres@devlam0:/home/postgres/exchange_bldlam/wal/wal.tar.gz">
postgres@devlam0:/home/postgres/exchange_bldlam/wal/wal.tar.gz</a> </dev/null<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks in advance<br>
<br>
--<o:p></o:p></p>
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<p class="MsoNormal">Daniele Di Vito<o:p></o:p></p>
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