mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-01-30 19:00:29 +08:00
Code Issues Packages Projects Releases Wiki Activity

Mention OIDs are now not created by default.

Browse Source
This commit is contained in:
Bruce Momjian 2006-11-22 04:17:03 +00:00
parent 8c556ce1c2
commit ba2edcac4f
2 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
doc/FAQ
View File

@ -1,7 +1,7 @@
Frequently Asked Questions (FAQ) for PostgreSQL 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) Current maintainer: Bruce Momjian (bruce@momjian.us)
@ -728,11 +728,11 @@
4.12) What is an OID? What is a CTID? 4.12) What is an OID? What is a CTID?
Every row that is created in PostgreSQL gets a unique OID unless If a table is created WITH OIDS, each row gets a unique a OID. OIDs
created WITHOUT OIDS. OIDs are automatically assigned unique 4-byte are automatically assigned unique 4-byte integers that are unique
integers that are unique across the entire installation. However, they across the entire installation. However, they overflow at 4 billion,
overflow at 4 billion, and then the OIDs start being duplicated. and then the OIDs start being duplicated. PostgreSQL uses OIDs to link
PostgreSQL uses OIDs to link its internal system tables together. its internal system tables together.
To uniquely number rows in user tables, it is best to use SERIAL To uniquely number rows in user tables, it is best to use SERIAL
rather than OIDs because SERIAL sequences are unique only within a rather than OIDs because SERIAL sequences are unique only within a

16
doc/src/FAQ/FAQ.html
View File

@ -10,7 +10,7 @@
alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <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= <P>Current maintainer: Bruce Momjian (<A href=
"mailto:bruce@momjian.us">bruce@momjian.us</A>) "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 <H3 id="item4.12">4.12) What is an <SMALL>OID</SMALL>? What is
a <SMALL>CTID</SMALL>?</H3> a <SMALL>CTID</SMALL>?</H3>
<P>Every row that is created in PostgreSQL gets a unique <P>If a table is created <SMALL>WITH OIDS</SMALL>, each row
<SMALL>OID</SMALL> unless created <SMALL>WITHOUT OIDS</SMALL>. gets a unique a <SMALL>OID</SMALL>. O<SMALL>ID</SMALL>s are
O<SMALL>ID</SMALL>s are automatically assigned unique 4-byte automatically assigned unique 4-byte integers that are unique
integers that are unique across the entire installation. However, across the entire installation. However, they overflow at 4
they overflow at 4 billion, and then the O<SMALL>ID</SMALL>s start billion, and then the O<SMALL>ID</SMALL>s start being duplicated.
being duplicated. PostgreSQL uses <SMALL>OID</SMALL>s to link its PostgreSQL uses <SMALL>OID</SMALL>s to link its internal system
internal system tables together.</P> tables together.</P>
<P>To uniquely number rows in user tables, it is best to use <P>To uniquely number rows in user tables, it is best to use
<SMALL>SERIAL</SMALL> rather than O<SMALL>ID</SMALL>s because <SMALL>SERIAL</SMALL> rather than O<SMALL>ID</SMALL>s because