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Mention OIDs are now not created by default.

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Bruce Momjian
2006-11-22 04:17:03 +00:00
parent 8c556ce1c2
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2 changed files with 14 additions and 14 deletions
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Tue Nov 21 10:37:54 EST 2006
Last updated: Tue Nov 21 23:16:54 EST 2006
Current maintainer: Bruce Momjian (bruce@momjian.us)
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4.12) What is an OID? What is a CTID?
Every row that is created in PostgreSQL gets a unique OID unless
created WITHOUT OIDS. OIDs are automatically assigned unique 4-byte
integers that are unique across the entire installation. However, they
overflow at 4 billion, and then the OIDs start being duplicated.
PostgreSQL uses OIDs to link its internal system tables together.
If a table is created WITH OIDS, each row gets a unique a OID. OIDs
are automatically assigned unique 4-byte integers that are unique
across the entire installation. However, they overflow at 4 billion,
and then the OIDs start being duplicated. PostgreSQL uses OIDs to link
its internal system tables together.
To uniquely number rows in user tables, it is best to use SERIAL
rather than OIDs because SERIAL sequences are unique only within a