Reduce lock levels of CREATE TRIGGER and some ALTER TABLE, CREATE RULE actions.

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Avoid hard-coding lockmode used for many altering DDL commands, allowing easier
future changes of lock levels. Implementation of initial analysis on DDL
sub-commands, so that many lock levels are now at ShareUpdateExclusiveLock or
ShareRowExclusiveLock, allowing certain DDL not to block reads/writes.
First of number of planned changes in this area; additional docs required
when full project complete.

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This commit is contained in:

Simon Riggs

2010-07-28 05:22:24 +00:00

parent 133924e13e

commit 2dbbda02e7

10 changed files with 426 additions and 232 deletions

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559

src/backend/commands/tablecmds.c

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