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Mention OIDs are now not created by default.

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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
doc
FAQ
src
FAQ
FAQ.html

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doc/src/FAQ/FAQ.html

@ -10,7 +10,7 @@
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