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51d16423ae
- Don't attempt to convert partial or expressional unique indexes
- Don't attempt to convert unique indexes based on a non-default
opclasses
- Untested prevention of conversion of non-btree indexes unique
indexes. Untested as postgresql doesn't allow hash, gist, or rtree
based indexes to be unique.
rbt=# create unique index t on a using hash (col);
ERROR: DefineIndex: access method "hash" does not support UNIQUE
indexes
rbt=# create unique index t on a using gist (col);
ERROR: DefineIndex: access method "gist" does not support UNIQUE
indexes
rbt=# select version();
version
------------------------------------------------------------------------
PostgreSQL 7.4devel on i386-unknown-freebsd4.8, compiled by GCC 2.95.4
Rod Taylor
46 lines
1.8 KiB
Plaintext
46 lines
1.8 KiB
Plaintext
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Dependency Additions For PostgreSQL 7.3 Upgrades
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In PostgreSQL releases prior to 7.3, certain database objects didn't
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have proper dependencies. For example:
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1) When you created a table with a SERIAL column, there was no linkage
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to its underlying sequence. If you dropped the table with the SERIAL
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column, the sequence was not automatically dropped.
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2) When you created a foreign key, it created three triggers. If you
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wanted to drop the foreign key, you had to drop the three triggers
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individually.
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3) When you created a column with constraint UNIQUE, a unique index was
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created but there was no indication that the index was created as a
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UNIQUE column constraint.
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Fortunately, PostgreSQL 7.3 and later now tracks such dependencies
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and handles these cases. Unfortunately, PostgreSQL dumps from prior
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releases don't contain such dependency information.
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This script operates on >= 7.3 databases and adds dependency information
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for the objects listed above. It prompts the user on whether to create
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a linkage for each object. You can use the -Y option to prevent such
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prompting and have it generate all possible linkages.
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This program requires the Pg:DBD Perl interface.
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Usage:
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adddepend [options] [dbname [username]]
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Options:
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-d <dbname> Specify database name to connect to (default: postgres)
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-h <host> Specify database server host (default: localhost)
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-p <port> Specify database server port (default: 5432)
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-u <username> Specify database username (default: postgres)
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--password=<pw> Specify database password (default: blank)
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-Y The script normally asks whether the user wishes to apply
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the conversion for each item found. This forces YES to all
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questions.
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Rod Taylor <pg@rbt.ca>
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