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CREATE TABLE test_replica_identity (
id serial primary key,
keya text not null,
keyb text not null,
nonkey text,
CONSTRAINT test_replica_identity_unique_defer UNIQUE (keya, keyb) DEFERRABLE,
CONSTRAINT test_replica_identity_unique_nondefer UNIQUE (keya, keyb)
) WITH OIDS;
CREATE TABLE test_replica_identity_othertable (id serial primary key);
CREATE INDEX test_replica_identity_keyab ON test_replica_identity (keya, keyb);
CREATE UNIQUE INDEX test_replica_identity_keyab_key ON test_replica_identity (keya, keyb);
CREATE UNIQUE INDEX test_replica_identity_oid_idx ON test_replica_identity (oid);
CREATE UNIQUE INDEX test_replica_identity_nonkey ON test_replica_identity (keya, nonkey);
CREATE INDEX test_replica_identity_hash ON test_replica_identity USING hash (nonkey);
CREATE UNIQUE INDEX test_replica_identity_expr ON test_replica_identity (keya, keyb, (3));
CREATE UNIQUE INDEX test_replica_identity_partial ON test_replica_identity (keya, keyb) WHERE keyb != '3';
-- default is 'd'/DEFAULT for user created tables
SELECT relreplident FROM pg_class WHERE oid = 'test_replica_identity'::regclass;
relreplident
--------------
d
(1 row)
-- but 'none' for system tables
SELECT relreplident FROM pg_class WHERE oid = 'pg_class'::regclass;
relreplident
--------------
n
(1 row)
SELECT relreplident FROM pg_class WHERE oid = 'pg_constraint'::regclass;
relreplident
--------------
n
(1 row)
----
-- Make sure we detect ineligible indexes
----
-- fail, not unique
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_keyab;
ERROR: cannot use non-unique index "test_replica_identity_keyab" as replica identity
-- fail, not a candidate key, nullable column
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_nonkey;
ERROR: index "test_replica_identity_nonkey" cannot be used as replica identity because column "nonkey" is nullable
-- fail, hash indexes cannot do uniqueness
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_hash;
ERROR: cannot use non-unique index "test_replica_identity_hash" as replica identity
-- fail, expression index
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_expr;
ERROR: cannot use expression index "test_replica_identity_expr" as replica identity
-- fail, partial index
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_partial;
ERROR: cannot use partial index "test_replica_identity_partial" as replica identity
-- fail, not our index
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_othertable_pkey;
ERROR: "test_replica_identity_othertable_pkey" is not an index for table "test_replica_identity"
-- fail, deferrable
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_unique_defer;
ERROR: cannot use non-immediate index "test_replica_identity_unique_defer" as replica identity
SELECT relreplident FROM pg_class WHERE oid = 'test_replica_identity'::regclass;
relreplident
--------------
d
(1 row)
----
-- Make sure index cases succeed
----
-- succeed, primary key
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_pkey;
SELECT relreplident FROM pg_class WHERE oid = 'test_replica_identity'::regclass;
relreplident
--------------
i
(1 row)
\d test_replica_identity
Table "public.test_replica_identity"
Column | Type | Collation | Nullable | Default
--------+---------+-----------+----------+---------------------------------------------------
id | integer | | not null | nextval('test_replica_identity_id_seq'::regclass)
keya | text | | not null |
keyb | text | | not null |
nonkey | text | | |
Indexes:
"test_replica_identity_pkey" PRIMARY KEY, btree (id) REPLICA IDENTITY
"test_replica_identity_expr" UNIQUE, btree (keya, keyb, (3))
"test_replica_identity_keyab_key" UNIQUE, btree (keya, keyb)
"test_replica_identity_nonkey" UNIQUE, btree (keya, nonkey)
"test_replica_identity_oid_idx" UNIQUE, btree (oid)
"test_replica_identity_partial" UNIQUE, btree (keya, keyb) WHERE keyb <> '3'::text
"test_replica_identity_unique_defer" UNIQUE CONSTRAINT, btree (keya, keyb) DEFERRABLE
"test_replica_identity_unique_nondefer" UNIQUE CONSTRAINT, btree (keya, keyb)
"test_replica_identity_hash" hash (nonkey)
"test_replica_identity_keyab" btree (keya, keyb)
-- succeed, oid unique index
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_oid_idx;
-- succeed, nondeferrable unique constraint over nonnullable cols
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_unique_nondefer;
-- succeed unique index over nonnullable cols
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_keyab_key;
ALTER TABLE test_replica_identity REPLICA IDENTITY USING INDEX test_replica_identity_keyab_key;
SELECT relreplident FROM pg_class WHERE oid = 'test_replica_identity'::regclass;
relreplident
--------------
i
(1 row)
\d test_replica_identity
Table "public.test_replica_identity"
Column | Type | Collation | Nullable | Default
--------+---------+-----------+----------+---------------------------------------------------
id | integer | | not null | nextval('test_replica_identity_id_seq'::regclass)
keya | text | | not null |
keyb | text | | not null |
nonkey | text | | |
Indexes:
"test_replica_identity_pkey" PRIMARY KEY, btree (id)
"test_replica_identity_expr" UNIQUE, btree (keya, keyb, (3))
"test_replica_identity_keyab_key" UNIQUE, btree (keya, keyb) REPLICA IDENTITY
"test_replica_identity_nonkey" UNIQUE, btree (keya, nonkey)
"test_replica_identity_oid_idx" UNIQUE, btree (oid)
"test_replica_identity_partial" UNIQUE, btree (keya, keyb) WHERE keyb <> '3'::text
"test_replica_identity_unique_defer" UNIQUE CONSTRAINT, btree (keya, keyb) DEFERRABLE
"test_replica_identity_unique_nondefer" UNIQUE CONSTRAINT, btree (keya, keyb)
"test_replica_identity_hash" hash (nonkey)
"test_replica_identity_keyab" btree (keya, keyb)
SELECT count(*) FROM pg_index WHERE indrelid = 'test_replica_identity'::regclass AND indisreplident;
count
-------
1
(1 row)
----
-- Make sure non index cases work
----
ALTER TABLE test_replica_identity REPLICA IDENTITY DEFAULT;
SELECT relreplident FROM pg_class WHERE oid = 'test_replica_identity'::regclass;
relreplident
--------------
d
(1 row)
SELECT count(*) FROM pg_index WHERE indrelid = 'test_replica_identity'::regclass AND indisreplident;
count
-------
0
(1 row)
ALTER TABLE test_replica_identity REPLICA IDENTITY FULL;
SELECT relreplident FROM pg_class WHERE oid = 'test_replica_identity'::regclass;
relreplident
--------------
f
(1 row)
\d+ test_replica_identity
Table "public.test_replica_identity"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+---------+-----------+----------+---------------------------------------------------+----------+--------------+-------------
id | integer | | not null | nextval('test_replica_identity_id_seq'::regclass) | plain | |
keya | text | | not null | | extended | |
keyb | text | | not null | | extended | |
nonkey | text | | | | extended | |
Indexes:
"test_replica_identity_pkey" PRIMARY KEY, btree (id)
"test_replica_identity_expr" UNIQUE, btree (keya, keyb, (3))
"test_replica_identity_keyab_key" UNIQUE, btree (keya, keyb)
"test_replica_identity_nonkey" UNIQUE, btree (keya, nonkey)
"test_replica_identity_oid_idx" UNIQUE, btree (oid)
"test_replica_identity_partial" UNIQUE, btree (keya, keyb) WHERE keyb <> '3'::text
"test_replica_identity_unique_defer" UNIQUE CONSTRAINT, btree (keya, keyb) DEFERRABLE
"test_replica_identity_unique_nondefer" UNIQUE CONSTRAINT, btree (keya, keyb)
"test_replica_identity_hash" hash (nonkey)
"test_replica_identity_keyab" btree (keya, keyb)
Replica Identity: FULL
Has OIDs: yes
ALTER TABLE test_replica_identity REPLICA IDENTITY NOTHING;
SELECT relreplident FROM pg_class WHERE oid = 'test_replica_identity'::regclass;
relreplident
--------------
n
(1 row)
DROP TABLE test_replica_identity;
DROP TABLE test_replica_identity_othertable;
|
