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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
commit ba2edcac4f
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)
@ -728,11 +728,11 @@
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

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doc/src/FAQ/FAQ.html
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alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Tue Nov 21 10:37:54 EST 2006</P>
<P>Last updated: Tue Nov 21 23:16:54 EST 2006</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:bruce@momjian.us">bruce@momjian.us</A>)
@ -956,13 +956,13 @@ length</TD></TR>
<H3 id="item4.12">4.12) What is an <SMALL>OID</SMALL>? What is
a <SMALL>CTID</SMALL>?</H3>
<P>Every row that is created in PostgreSQL gets a unique
<SMALL>OID</SMALL> unless created <SMALL>WITHOUT OIDS</SMALL>.
O<SMALL>ID</SMALL>s are automatically assigned unique 4-byte
integers that are unique across the entire installation. However,
they overflow at 4 billion, and then the O<SMALL>ID</SMALL>s start
being duplicated. PostgreSQL uses <SMALL>OID</SMALL>s to link its
internal system tables together.</P>
<P>If a table is created <SMALL>WITH OIDS</SMALL>, each row
gets a unique a <SMALL>OID</SMALL>. O<SMALL>ID</SMALL>s are
automatically assigned unique 4-byte integers that are unique
across the entire installation. However, they overflow at 4
billion, and then the O<SMALL>ID</SMALL>s start being duplicated.
PostgreSQL uses <SMALL>OID</SMALL>s to link its internal system
tables together.</P>
<P>To uniquely number rows in user tables, it is best to use
<SMALL>SERIAL</SMALL> rather than O<SMALL>ID</SMALL>s because