While playing around with logical replication, I am confused by the
behavior of REPLICA IDENTITY FULL.
First I created a table having 2 INT columns with no keys. If I
execute ALTER TABLE REPLICA IDENTITY FULL, replication for
UPDATE/DELETE works.
In the session below, port 11002 is the publisher side, while 11003 is
the subscriber side.
+ psql -e -p 11002 -c create table t3(i int, j int); test
create table t3(i int, j int);
CREATE TABLE
+ psql -e -p 11003 -c create table t3(i int, j int); test
create table t3(i int, j int);
CREATE TABLE
+ psql -e -p 11002 -c alter table t3 replica identity full test
alter table t3 replica identity full
ALTER TABLE
+ psql -e -p 11002 -c insert into t3 values(1,1); test
insert into t3 values(1,1);
INSERT 0 1
+ psql -e -p 11002 -c insert into t3 values(2,2); test
insert into t3 values(2,2);
INSERT 0 1
+ psql -e -p 11002 -c insert into t3 values(2,2); test
insert into t3 values(2,2);
INSERT 0 1
+ psql -e -p 11003 -c ALTER SUBSCRIPTION mysub REFRESH PUBLICATION; test
ALTER SUBSCRIPTION mysub REFRESH PUBLICATION;
NOTICE: added subscription for table public.t3
ALTER SUBSCRIPTION
+ sleep 3
+ psql -e -p 11003 -c select * from t3; test
select * from t3;
i | j
---+---
1 | 1
2 | 2
2 | 2
(3 rows)
+ psql -e -p 11002 -c update t3 set j = 10 where i = 2 and j = 2; test
update t3 set j = 10 where i = 2 and j = 2;
UPDATE 2
+ psql -e -p 11003 -c select * from t3; test
select * from t3;
i | j
---+----
1 | 1
2 | 10
2 | 10
(3 rows)
+ psql -e -p 11002 -c delete from t3 where i = 2; test
delete from t3 where i = 2;
DELETE 2
+ psql -e -p 11003 -c select * from t3; test
Pager usage is off.
select * from t3;
i | j
---+---
1 | 1
(1 row)
However, if a table has text columns, UPDATE/DELETE replication does
not work any more. Am I missing something?
+ psql -e -p 11002 -c create table t4(i text, j text); test
create table t4(i text, j text);
CREATE TABLE
+ psql -e -p 11003 -c create table t4(i text, j text); test
create table t4(i text, j text);
CREATE TABLE
+ psql -e -p 11002 -c alter table t4 replica identity full test
alter table t4 replica identity full
ALTER TABLE
+ psql -e -p 11002 -c insert into t4 values('a','a'); test
insert into t4 values('a','a');
INSERT 0 1
+ psql -e -p 11002 -c insert into t4 values('b','b'); test
insert into t4 values('b','b');
INSERT 0 1
+ psql -e -p 11002 -c insert into t4 values('b','b'); test
insert into t4 values('b','b');
INSERT 0 1
+ psql -e -p 11003 -c ALTER SUBSCRIPTION mysub REFRESH PUBLICATION; test
ALTER SUBSCRIPTION mysub REFRESH PUBLICATION;
NOTICE: added subscription for table public.t4
ALTER SUBSCRIPTION
+ sleep 3
+ psql -e -p 11003 -c select * from t4; test
select * from t4;
i | j
---+---
a | a
b | b
b | b
(3 rows)
+ psql -e -p 11002 -c update t4 set j = 'c' where i = 'b' and j = 'b'; test
update t4 set j = 'c' where i = 'b' and j = 'b';
UPDATE 2
+ psql -e -p 11003 -c select * from t4; test
select * from t4;
i | j
---+---
a | a
b | b
b | b
(3 rows)
+ psql -e -p 11002 -c delete from t4 where i = 'b'; test
delete from t4 where i = 'b';
DELETE 2
+ psql -e -p 11003 -c select * from t4; test
select * from t4;
i | j
---+---
a | a
b | b
b | b
(3 rows)
Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp
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