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Add note pointing out that read-only commands no longer consume 

command IDs.
This commit is contained in:
Tom Lane 2008-01-13 17:58:54 +00:00
parent 149db6b6b7
commit 05a381add9
1 changed files with 5 additions and 3 deletions
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8
doc/src/sgml/ddl.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.80 2007/12/03 23:49:50 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.81 2008/01/13 17:58:54 tgl Exp $ -->
<chapter id="ddl">
<title>Data Definition</title>
@ -1034,12 +1034,14 @@ CREATE TABLE order_items (
</para>
<para>
Command
identifiers are also 32-bit quantities. This creates a hard limit
Command identifiers are also 32-bit quantities. This creates a hard limit
of 2<superscript>32</> (4 billion) <acronym>SQL</acronym> commands
within a single transaction. In practice this limit is not a
problem &mdash; note that the limit is on number of
<acronym>SQL</acronym> commands, not number of rows processed.
Also, as of <productname>PostgreSQL</productname> 8.3, only commands
that actually modify the database contents will consume a command
identifier.
</para>
</sect1>