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Postgres FD Implementation
Commit c16ef167 authored by Bruce Momjian's avatar Bruce Momjian
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Update FAQ.

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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Tue Feb 12 12:14:52 EST 2002 Last updated: Tue Feb 12 12:18:09 EST 2002
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...@@ -81,7 +81,7 @@ ...@@ -81,7 +81,7 @@
4.15.3) Don't currval() and nextval() lead to a race condition with 4.15.3) Don't currval() and nextval() lead to a race condition with
other users? other users?
4.15.4) Why aren't my sequence numbers reused on transaction abort? 4.15.4) Why aren't my sequence numbers reused on transaction abort?
Why are there gaps in the numbers of my sequence/SERIAL column? Why are there gaps in the numbering of my sequence/SERIAL column?
4.16) What is an OID? What is a TID? 4.16) What is an OID? What is a TID?
4.17) What is the meaning of some of the terms used in PostgreSQL? 4.17) What is the meaning of some of the terms used in PostgreSQL?
4.18) Why do I get the error "ERROR: Memory exhausted in 4.18) Why do I get the error "ERROR: Memory exhausted in
...@@ -866,10 +866,10 @@ BYTEA bytea variable-length byte array (null-byte safe) ...@@ -866,10 +866,10 @@ BYTEA bytea variable-length byte array (null-byte safe)
by all users. by all users.
4.15.4) Why aren't my sequence numbers reused on transaction abort? Why are 4.15.4) Why aren't my sequence numbers reused on transaction abort? Why are
there gaps in the numbers of my sequence/SERIAL column? there gaps in the numbering of my sequence/SERIAL column?
To improve concurrency, sequence values are given out to running To improve concurrency, sequence values are given out to running
transactions as needed and are now locked until the transaction transactions as needed and are not locked until the transaction
completes. This causes gaps in numbering from aborted transactions. completes. This causes gaps in numbering from aborted transactions.
4.16) What is an OID? What is a TID? 4.16) What is an OID? What is a TID?
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doc/src/FAQ/FAQ.html
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...@@ -14,7 +14,7 @@ ...@@ -14,7 +14,7 @@
alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Tue Feb 12 12:14:52 EST 2002</P> <P>Last updated: Tue Feb 12 12:18:09 EST 2002</P>
<P>Current maintainer: Bruce Momjian (<A href= <P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR> "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
...@@ -120,7 +120,7 @@ ...@@ -120,7 +120,7 @@
<A href="#4.15.3">4.15.3</A>) Don't <I>currval()</I> and <A href="#4.15.3">4.15.3</A>) Don't <I>currval()</I> and
<I>nextval()</I> lead to a race condition with other users?<BR> <I>nextval()</I> lead to a race condition with other users?<BR>
<A href="#4.15.4">4.15.4</A>) Why aren't my sequence numbers reused <A href="#4.15.4">4.15.4</A>) Why aren't my sequence numbers reused
on transaction abort? Why are there gaps in the numbers of my on transaction abort? Why are there gaps in the numbering of my
sequence/SERIAL column?<BR> sequence/SERIAL column?<BR>
<A href="#4.16">4.16</A>) What is an <SMALL>OID</SMALL>? What is a <A href="#4.16">4.16</A>) What is an <SMALL>OID</SMALL>? What is a
<SMALL>TID</SMALL>?<BR> <SMALL>TID</SMALL>?<BR>
...@@ -1096,13 +1096,12 @@ BYTEA bytea variable-length byte array (null-byte safe) ...@@ -1096,13 +1096,12 @@ BYTEA bytea variable-length byte array (null-byte safe)
backend, not by all users.</P> backend, not by all users.</P>
<H4><A name="4.15.4">4.15.4</A>) Why aren't my sequence numbers reused <H4><A name="4.15.4">4.15.4</A>) Why aren't my sequence numbers reused
on transaction abort? Why are there gaps in the numbers of my on transaction abort? Why are there gaps in the numbering of my
sequence/SERIAL column?</H4> sequence/SERIAL column?</H4>
<P>To improve concurrency, sequence values are given out to running <P>To improve concurrency, sequence values are given out to running
transactions as needed and are now <i>locked</i> until the transactions as needed and are not locked until the transaction
transaction completes. This causes gaps in numbering from aborted completes. This causes gaps in numbering from aborted transactions.
transactions.
<H4><A name="4.16">4.16</A>) What is an <SMALL>OID</SMALL>? What is <H4><A name="4.16">4.16</A>) What is an <SMALL>OID</SMALL>? What is
a <SMALL>TID</SMALL>?</H4> a <SMALL>TID</SMALL>?</H4>
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