Streaming replication slots are a new facility introduced in PostgreSQL 9.4. They are a persistent record of the state of a replica that is kept on the master server even when the replica is offline and disconnected. They aren’t used for physical replication by default, so you’ll only be dealing with them if you enable their use. Craig Ringer: Streaming replication slots in PostgreSQL 9.4 Streaming replication slots are a new facility introduced in PostgreSQL 9.4. They are a persistent record of the state of a replica that is kept on the master server even when the replica is offline and disconnected. They aren’t used for physical replication by default, so you’ll only be dealing with them if you enable their use. PostgreSQL Replication Slots - YouTube Learn how to use replication slots with PostgreSQL's streaming physical replication. We also discuss the benefits and disadvantages. ... Replicacion en PostgreSQL 9.4 - Duration: 25:21. NEOMATRIX ... Réplication logique avec PostgreSQL 9 - dalibo.org
PostgreSQL Replication Slots - YouTube
PostgreSQL 9.4 streaming replication over SSL with Replication Slots I never really liked the concept of keeping wal files in case the replica goes down proactively, setting wal_keep_segments was always a tricky number and most of the time we ended up setting this for the worst case scenario, something that means space consumption for no (under ... Streaming replication slots in PostgreSQL 9.4 - Still ... Streaming replication slots are a new facility introduced in PostgreSQL 9.4. They are a persistent record of the state of a replica that is kept on the master server even when the replica is offline and disconnected. They aren’t used for physical replication by default, so you’ll only be dealing with them if you enable their use. Craig Ringer: Streaming replication slots in PostgreSQL 9.4
postgresql - Postgres 9.4, replication slots, doesn't work ...
7 Things To Watch Out For In Your PostgreSQL Deployment… When streaming replication is used to replicate all changes from a primary PostgreSQL server to a hot standby (aka read replica), there is a usually a slight delay between the time when row updates happen on the primary and when the changes … Failover slots for PostgreSQL | Replication slots are not themselves synced to physical replicas so you can’t continue to use a slot after a master failure results in promotion of a standby.
Setting it to a lower value than the number of currently existing replication slots will prevent the server from starting. wal_keep_segments (integer) Specifies the minimum number of past log file segments kept in the pg_xlog directory, in case a standby server needs to fetch them for streaming replication. Each segment is normally 16 megabytes.
standby_mode = 'on' primary_slot_name = 'it_rdbms02' primary_conninfo = 'host=10.1.10.150 port=5433 user=replication password=reppassword' trigger_file = '/etc/postgresql/9.5/main/im_the_master' PostgreSQL configuration # Enable replication connections; set this figure to at least one more # than the number of standbys which will connect to this server # (note that repmgr will execute `pg_basebackup` in WAL streaming mode, # which requires two free WAL … repmgr 4.3 Documentation repmgr=# Select * FROM pg_stat_replication; -[ Record 1 ]-- pid | 19111 usesysid | 16384 usename | repmgr application_name | node2 client_addr | 192.168.1.12 client_hostname | client_port | 50378 backend_start | 2017-08-28 15:14:19.851581 … PostgreSQL Replication - Second Edition | Packt Books
7 Things To Watch Out For In Your PostgreSQL Deployment…
The replication slot must be inactive, i.e. no active connections. So if there's a streaming replica using the slot you must stop the streaming replica. Or you can change its recovery.conf so it doesn't use a slot anymore and restart it. PostgreSQL: Documentation: 9.4: pg_replication_slots
Documentation → PostgreSQL 9.4. ... Specifies the maximum number of replication slots (see Section 25.2.6) that the server can support. The default is zero. This parameter can only be set at server start. ... in case a standby server needs to fetch them for streaming replication. Each segment is normally 16 megabytes. Streaming replication slots in PostgreSQL 9.4 ...