Using PostgreSQL Logical Replication to Maintain an Always Up-to

Before replication slots, it was not possible for the primary to determine this, and you'd end up in situations where a standby was left stranded because a WAL

Using PostgreSQL Logical Replication to Maintain an Always Up-to Creating a logical replication slot Page 7 7 ○ Built-in core ○ May fail to take a “catalog snapshot” Can we create logical slots

Before replication slots, it was not possible for the primary to determine this, and you'd end up in situations where a standby was left stranded because a WAL

millionaire genie slot machine Also, replication slots on a given standby persist the promotion of that standby to a primary This means that in the event of a primary DB instance failover or

Replication slots for High Availability A replication slot exists solely on the instance that created it, and PostgreSQL does not replicate it on the standby

creation of replication slot failed If the owner of the subscription does not have the necessary permissions, then the operation fails with an error slot alice_sub on

Allow you to replicate data out of Postgres · Use the write-ahead log as the source of changes · Use logical replication slots to send out