Hello,
I'm trying to use a blue/green deployment in Amazon RDS, which uses Postgres logical replication to keep blue and green environments in sync.
Some parts of our app use temporary tables, and in some cases we CREATE INDEX on those tables and sometimes DROP and recreate them.
The CREATE INDEX and DROP TABLE statements are causing problems with the blue/green replication. (They are detected by RDS, and cause the deployment to be marked as "degraded" and subsequently unusable.)
My (limited) understanding is that this happens because CREATE TEMPORARY TABLE doesn't get written to the WAL, but the other statements do.
My question is whether there is some workaround that will let me create indexes on a temporary table, and also let me drop the temporary table, in a way that doesn't end up "degrading" replication? (Presumably that means avoiding writing to the WAL?)
I've discovered that I can at least create a primary key inline as part of the temporary table definition, which gives me a way to create a single (unique) index, i.e.:
CREATE TEMPORARY TABLE foo (id INT PRIMARY KEY, …)
But I haven't discovered a way to drop the table, or to create other indexes.
Cheers,
Stuart
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