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doc: "Latest checkpoint location" will not match in pg_upgrade
Mention that "Latest checkpoint location" will not match in pg_upgrade if the standby server is still running during the upgrade, which is possible. "Match" text first appeared in PG 9.5. Reported-by: Paul Bonaud Discussion: https://postgr.es/m/c7268794-edb4-1772-3bfd-04c54585c24e@trainline.com Backpatch-through: 9.5
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@ -326,7 +326,8 @@ NET STOP postgresql-9.0
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against the old primary and standby clusters. Verify that the
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against the old primary and standby clusters. Verify that the
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<quote>Latest checkpoint location</> values match in all clusters.
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<quote>Latest checkpoint location</> values match in all clusters.
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(There will be a mismatch if old standby servers were shut down
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(There will be a mismatch if old standby servers were shut down
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before the old primary.) Also, change <varname>wal_level</> to
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before the old primary or if the old standby servers are still running.)
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Also, change <varname>wal_level</varname> to
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<literal>replica</> in the <filename>postgresql.conf</> file on the
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<literal>replica</> in the <filename>postgresql.conf</> file on the
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new primary cluster.
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new primary cluster.
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</para>
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</para>
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