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(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
