postgresql 10 pub/sub使用简明教程

1.初始化配置

1).pubdb

postgres=# create database pubdb;

postgres=# c pubdb

You are now connected to database "pubdb" as user "postgres".

pubdb=# create table t1(id bigserial primary key,name varchar(20));

CREATE TABLE

pubdb=# create publication pub_mdb1_t1 for table t1;

CREATE PUBLICATION

pubdb=#

pubdb=# select * from pg_publication;

pubname | pubowner | puballtables | pubinsert | pubupdate | pubdelete

-------------+----------+--------------+-----------+-----------+-----------

pub_mdb1_t1 | 10 | f | t | t | t

(1 row)

pubdb=#

pubdb=# insert into t1(name) values ('Peter'),('Chris'),('Jasmine'),('Jeans'),('Willam');

INSERT 0 5

pubdb=# select * from t1;

id | name

----+---------

1 | Peter

2 | Chris

3 | Jasmine

4 | Jeans

5 | Willam

(5 rows)

pubdb=#

pubdb=#

pubdb=# q

[postgres@pgmdb01 ~]$

2).subdb

$ createdb subdb

恢复原发布数据

$ pg_restore -d subdb t1.dump

创建提交，不复制原存在数据,此时sub端启动一个logical replication worker，

pub端创建一个pg_replication_slot

$ psql subdb

subdb=# CREATE SUBSCRIPTION sub_mdb1_t1

CONNECTION 'host=172.16.3.228 port=5432 user=postgres password=123456 dbname=pubdb'

PUBLICATION pub_mdb1_t1

WITH (copy_data = false);

NOTICE: created replication slot "sub_mdb1_t1" on publisher

CREATE SUBSCRIPTION

subdb=#

subdb=#

subdb=#

subdb=# select * from t1;

id | name

----+---------

1 | Peter

2 | Chris

3 | Jasmine

4 | Jeans

5 | Willam

(5 rows)

查看提交信息

subdb=# dRs+

List of subscriptions

-[ RECORD 1 ]------+-----------------------------------------------------------------------

Name | sub_mdb1_t1

Owner | postgres

Enabled | t

Publication | {pub_mdb1_t1}

Synchronous commit | off

Conninfo | host=172.16.3.228 port=5432 user=postgres password=123456 dbname=pubdb

subdb=# dRs

List of subscriptions

-[ RECORD 1 ]--------------

Name | sub_mdb1_t1

Owner | postgres

Enabled | t

Publication | {pub_mdb1_t1}

subdb=#

3).pubdb查看发布复制信息

pubdb=#

pubdb=# select * from pg_stat_replication;

-[ RECORD 1 ]----+------------------------------

pid | 16501

usesysid | 10

usename | postgres

application_name | sub_mdb1_t1

client_addr | 172.16.3.230

client_hostname |

client_port | 52682

backend_start | 2017-10-10 14:59:18.469715+08

backend_xmin |

state | streaming

sent_lsn | 0/F036E90

write_lsn | 0/F036E90

flush_lsn | 0/F036E90

replay_lsn | 0/F036E90

write_lag |

flush_lag |

replay_lag |

sync_priority | 0

sync_state | async

pubdb=# select * from pg_replication_slots ;

-[ RECORD 1 ]-------+------------

slot_name | sub_mdb1_t1

plugin | pgoutput

slot_type | logical

datoid | 26203

database | pubdb

temporary | f

active | t

active_pid | 16501

xmin |

catalog_xmin | 604

restart_lsn | 0/F036E58

confirmed_flush_lsn | 0/F036E90

2.插入增量发布记录

1).pubdb插入增量

pubdb=# pubdb=# insert into t1(name) values('Zeng'),('Feng'),('Mia');

INSERT 0 3

pubdb=# x

Expanded display is off.

pubdb=# select * from t1;

id | name

----+---------

1 | Peter

2 | Chris

3 | Jasmine

4 | Jeans

5 | Willam

6 | Zeng

7 | Feng

8 | Mia

(8 rows)

pubdb=#

pubdb=# select * from pg_stat_replication;

-[ RECORD 1 ]----+------------------------------

pid | 16501

usesysid | 10

usename | postgres

application_name | sub_mdb1_t1

client_addr | 172.16.3.230

client_hostname |

client_port | 52682

backend_start | 2017-10-10 14:59:18.469715+08

backend_xmin |

state | streaming

sent_lsn | 0/F0372B8

write_lsn | 0/F0372B8

flush_lsn | 0/F0372B8

replay_lsn | 0/F0372B8

write_lag |

flush_lag |

replay_lag |

sync_priority | 0

sync_state | async

pubdb=# select * from pg_replication_slots ;

-[ RECORD 1 ]-------+------------

slot_name | sub_mdb1_t1

plugin | pgoutput

slot_type | logical

datoid | 26203

database | pubdb

temporary | f

active | t

active_pid | 16501

xmin |

catalog_xmin | 605

restart_lsn | 0/F037280

confirmed_flush_lsn | 0/F0372B8

pubdb=#

[postgres@pgmdb01 ~]$ ps -fU postgres

UID PID PPID C STIME TTY TIME CMD

postgres 15874 15873 0 12:44 pts/2 00:00:00 -bash

postgres 15950 1 0 12:50 ? 00:00:00 /opt/pgsql/10.0/bin/postmaster -D /pgdata10

postgres 15951 15950 0 12:50 ? 00:00:00 postgres: logger process

postgres 15953 15950 0 12:50 ? 00:00:00 postgres: checkpointer process

postgres 15954 15950 0 12:50 ? 00:00:00 postgres: writer process

postgres 15955 15950 0 12:50 ? 00:00:00 postgres: wal writer process

postgres 15956 15950 0 12:50 ? 00:00:00 postgres: autovacuum launcher process

postgres 15957 15950 0 12:50 ? 00:00:00 postgres: archiver process

postgres 15958 15950 0 12:50 ? 00:00:00 postgres: stats collector process

postgres 15959 15950 0 12:50 ? 00:00:00 postgres: bgworker: logical replication launcher

postgres 15961 15960 0 12:50 pts/1 00:00:00 -bash

postgres 16077 15874 0 13:08 pts/2 00:00:00 tail -f postgresql-Tue.log

postgres 16082 15950 0 13:10 ? 00:00:00 postgres: postgres pubdb 172.16.3.223(56608) idle

postgres 16083 15950 0 13:10 ? 00:00:00 postgres: postgres pubdb 172.16.3.223(56610) idle

postgres 16501 15950 0 14:59 ? 00:00:00 postgres: wal sender process postgres 172.16.3.230(52682) idle

postgres 16543 15961 0 15:09 pts/1 00:00:00 ps -fU postgres

[postgres@pgmdb01 ~]$

sequence增长为最新值8

CREATE SEQUENCE public.t1_id_seq

INCREMENT 1

START 8

MINVALUE 1

MAXVALUE 9223372036854775807

CACHE 1;

2).查看增量提交记录

subdb

subdb=# select * from t1;

id | name

----+---------

1 | Peter

2 | Chris

3 | Jasmine

4 | Jeans

5 | Willam

6 | Zeng

7 | Feng

8 | Mia

(8 rows)

subdb=#

[postgres@pgsubdb1 log]$ ps -fU postgres

UID PID PPID C STIME TTY TIME CMD

postgres 935 1 0 10:28 ? 00:00:01 /opt/pgsql/10.0/bin/postmaster -D /pgdata10

postgres 1001 935 0 10:28 ? 00:00:00 postgres: logger process

postgres 1005 935 0 10:28 ? 00:00:00 postgres: checkpointer process

postgres 1006 935 0 10:28 ? 00:00:00 postgres: writer process

postgres 1007 935 0 10:28 ? 00:00:01 postgres: wal writer process

postgres 1008 935 0 10:28 ? 00:00:00 postgres: autovacuum launcher process

postgres 1009 935 0 10:28 ? 00:00:00 postgres: archiver process

postgres 1010 935 0 10:28 ? 00:00:00 postgres: stats collector process

postgres 1011 935 0 10:28 ? 00:00:00 postgres: bgworker: logical replication launcher

postgres 1084 1083 0 10:28 pts/0 00:00:00 -bash

postgres 15551 15550 0 11:48 pts/1 00:00:00 -bash

postgres 16206 16205 0 14:40 pts/2 00:00:00 -bash

postgres 16276 1084 0 14:46 pts/0 00:00:00 psql subdb

postgres 16277 935 0 14:46 ? 00:00:00 postgres: postgres subdb [local] idle

postgres 16324 16206 0 14:56 pts/2 00:00:00 psql subdb

postgres 16325 935 0 14:56 ? 00:00:00 postgres: postgres subdb [local] idle

postgres 16332 935 0 14:59 ? 00:00:00 postgres: bgworker: logical replication worker for subscription 24626

postgres 16374 15551 0 15:11 pts/1 00:00:00 ps -fU postgres

[postgres@pgsubdb1 log]$

sequence为原始值5，不增长

CREATE SEQUENCE public.t1_id_seq

INCREMENT 1

START 5

MINVALUE 1

MAXVALUE 9223372036854775807

CACHE 1;

3.常见问题(特殊情景使用请参见官方文档)

当远程数据库无法连接时,drop SUBSCRIPTION

# ALTER SUBSCRIPTION name DISABLE

# alter subscription sub_measurement set (slot_name=none);

# drop subscription sub_measurement;

（编辑：李大同）

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