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