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84 lines
3.0 KiB
Plaintext
84 lines
3.0 KiB
Plaintext
contrib/pg_upgrade/TESTING
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The most effective way to test pg_upgrade, aside from testing on user
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data, is by upgrading the PostgreSQL regression database.
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This testing process first requires the creation of a valid regression
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database dump. Such files contain most database features and are
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specific to each major version of Postgres.
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Here are the steps needed to create a regression database dump file:
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1) Create and populate the regression database in the old cluster
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This database can be created by running 'gmake installcheck' from
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src/test/regression.
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2) Use pg_dump to dump out the regression database. Use the new
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cluster's pg_dump on the old database to minimize whitespace
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differences in the diff.
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3) Adjust the regression database dump file
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a) Perform the load/dump twice
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This fixes problems with the ordering of COPY columns for
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inherited tables.
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b) Change CREATE FUNCTION shared object paths to use '$libdir'
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The old and new cluster will have different shared object paths.
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c) Fix any wrapping format differences
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Commands like CREATE TRIGGER and ALTER TABLE sometimes have
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differences.
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d) For pre-9.0, change CREATE OR REPLACE LANGUAGE to CREATE LANGUAGE
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e) For pre-9.0, remove 'regex_flavor'
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f) For pre-9.0, adjust extra_float_digits
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Postgres 9.0 pg_dump uses extra_float_digits=-2 for pre-9.0
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databases, and extra_float_digits=-3 for >= 9.0 databases.
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It is necessary to modify 9.0 pg_dump to always use -3, and
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modify the pre-9.0 old server to accept extra_float_digits=-3.
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Once the dump is created, it can be repeatedly loaded into the old
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database, upgraded, and dumped out of the new database, and then
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compared to the original version. To test the dump file, perform these
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steps:
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1) Create the old and new clusters in different directories.
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2) Copy the regression shared object files into the appropriate /lib
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directory for old and new clusters.
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3) Create the regression database in the old server.
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4) Load the dump file created above into the regression database;
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check for errors while loading.
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5) Upgrade the old database to the new major version, as outlined in
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the pg_upgrade manual section.
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6) Use pg_dump to dump out the regression database in the new cluster.
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7) Diff the regression database dump file with the regression dump
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file loaded into the old server.
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The shell script test.sh in this directory performs more or less this
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procedure. You can invoke it by running
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gmake check
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or by running
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gmake installcheck
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if "gmake install" (or "gmake install-world") were done beforehand.
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When invoked without arguments, it will run an upgrade from the
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version in this source tree to a new instance of the same version. To
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test an upgrade from a different version, invoke it like this:
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gmake installcheck oldbindir=...otherversion/bin oldsrc=...somewhere/postgresql
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In this case, you will have to manually eyeball the resulting dump
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diff for version-specific differences, as explained above.
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