Обсуждение: pgsql: Extend ALTER TABLE to allow Foreign Keys to be added without ini
Extend ALTER TABLE to allow Foreign Keys to be added without initial validation. FK constraints that are marked NOT VALID may later be VALIDATED, which uses an ShareUpdateExclusiveLock on constraint table and RowShareLock on referenced table. Significantly reduces lock strength and duration when adding FKs. New state visible from psql. Simon Riggs, with reviews from Marko Tiikkaja and Robert Haas Branch ------ master Details ------- http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=722bf7017bbe796decc79c1fde03e7a83dae9ada Modified Files -------------- doc/src/sgml/ref/alter_table.sgml | 22 ++++++- src/backend/catalog/heap.c | 1 + src/backend/catalog/index.c | 1 + src/backend/catalog/pg_constraint.c | 2 + src/backend/commands/tablecmds.c | 105 +++++++++++++++++++++++++++-- src/backend/commands/trigger.c | 1 + src/backend/commands/typecmds.c | 1 + src/backend/parser/gram.y | 28 +++++++- src/backend/utils/adt/ri_triggers.c | 7 ++- src/bin/psql/describe.c | 9 ++- src/include/catalog/pg_constraint.h | 40 ++++++----- src/include/nodes/parsenodes.h | 2 + src/include/parser/kwlist.h | 1 + src/test/regress/expected/alter_table.out | 12 +++ src/test/regress/sql/alter_table.sql | 15 ++++ 15 files changed, 215 insertions(+), 32 deletions(-)
--On 8. Februar 2011 12:24:11 +0000 Simon Riggs <simon@2ndQuadrant.com>
wrote:
> Extend ALTER TABLE to allow Foreign Keys to be added without initial
> validation. FK constraints that are marked NOT VALID may later be
> VALIDATED, which uses an ShareUpdateExclusiveLock on constraint table and
> RowShareLock on referenced table. Significantly reduces lock strength and
> duration when adding FKs. New state visible from psql.
Hi Simon,
It seems this commit misses updates to system catalogs documentation
regarding pg_constraint.conisvalidated.
Bernd