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| -rw-r--r-- | doc/src/sgml/rules.sgml | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/doc/src/sgml/rules.sgml b/doc/src/sgml/rules.sgml index eaad266f363..1ef7b29adbc 100644 --- a/doc/src/sgml/rules.sgml +++ b/doc/src/sgml/rules.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/rules.sgml,v 1.40 2005/01/23 00:30:18 momjian Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/rules.sgml,v 1.41 2005/01/29 23:45:36 tgl Exp $ --> <chapter id="rules"> <title>The Rule System</title> @@ -1000,12 +1000,11 @@ CREATE RULE <replaceable>rule_name</> AS ON <replaceable>event</> The query trees generated from rule actions are thrown into the rewrite system again, and maybe more rules get applied resulting in more or less query trees. - So the query trees in the rule actions must have either a different command type - or a different result relation, otherwise, this recursive process will end up in a loop. - There is a fixed recursion limit of currently 100 iterations. - If after 100 iterations there are still update rules to apply, the - rule system assumes a loop over multiple rule definitions and reports - an error. + So a rule's actions must have either a different + command type or a different result relation than the rule itself is + on, otherwise this recursive process will end up in an infinite loop. + (Recursive expansion of a rule will be detected and reported as an + error.) </para> <para> |