WAL-files restore and nextval('PK') - Mailing list pgsql-sql

<div class="Section1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman","serif"">Dear
all,</span><pclass="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman","serif""> </span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif"">after an WAL-restore
ofour Postgres DB, we observe seemingly wrong values of our sequences.</span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif""> </span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif"">We have two postgres server (8.4) with pgpool in
replicationmode. </span><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif""> </span><pclass="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif"">Recentlywe tested our restore procedure and played our WAL-files into the second server after an old
file-systembackup was restored.</span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif"">Accidently, we aborted the starting server and had to
restartit and therefore started WAL-replay again.</span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif""> </span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif"">Now we observe, that the newly restored server has higher
valuesin his sequences as the other server.</span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif""> </span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif"">Could it be that during restart of the WAL-file restore
SELECTnextval(‘PK’) ; commands were executed again, whereas the data rows were already restored and thus leading to
highersequence numbers on the newly restored server?</span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif""> </span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif"">Best regards for any comments!</span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif""> </span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif"">Andreas</span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif""> </span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif""> </span><p
class="MsoNormal"><span
style="font-size:10.0pt">___________________________________________________________________________</span><p
class="MsoNormal"><spanstyle="font-size:10.0pt"> </span><p class="MsoNormal"><span
style="font-size:10.0pt">SCANLAB AG</span><pclass="MsoNormal"><span
style="font-size:10.0pt">Dr. Andreas Simon Gaab</span><pclass="MsoNormal"><span style="font-size:10.0pt">Entwicklung •
R & D</span><pclass="MsoNormal"><span style="font-size:10.0pt"> </span><p class="MsoNormal"><span
style="font-size:10.0pt">Siemensstr. 2a• 82178 Puchheim • Germany</span><p class="MsoNormal"><span
style="font-size:10.0pt">Tel. +49 (89) 800 746-513• Fax +49 (89) 800 746-199</span><p class="MsoNormal"><span
style="font-size:10.0pt"><ahref="mailto:a.gaab@scanlab.de">mailto:a.gaab@scanlab.de</a> • <a
href="http://www.scanlab.de">www.scanlab.de</a></span><pclass="MsoNormal"><span style="font-size:10.0pt"> </span><p
class="MsoNormal"><spanstyle="font-size:10.0pt">Amtsgericht München: HRB 124707 • USt-IdNr.: DE 129 456 351</span><p
class="MsoNormal"><spanstyle="font-size:10.0pt">Vorstand: Georg Hofner (Sprecher), Christian Huttenloher,
Norbert Petschik</span><pclass="MsoNormal"><span style="font-size:10.0pt">Aufsichtsrat (Vorsitz):
Dr. Hans J. Langer</span><pclass="MsoNormal"><span
style="font-size:10.0pt">___________________________________________________________________________</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""></span><pclass="MsoNormal"> </div>