docs: add IvorySQL 5.4 Pgpool-II integration guide - #296
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Summary
Why
Pgpool-II adds connection pooling, streaming-replication awareness, and read scaling in front of IvorySQL. The existing ecosystem documentation did not contain a tested IvorySQL-specific setup or explain the boundary between a minimal pooling configuration and a production failover design.
Fixes IvorySQL/IvorySQL#1118
Validation
Environment: Ubuntu 22.04 x86_64, IvorySQL 5.4 / PostgreSQL 18.4, Pgpool-II 4.7.2.
SHOW POOL_NODESreported both nodesup, withprimary/standbyroles and zero replication delaySHOW POOL_PROCESSESconfirmed backend connection-pool activityivorysql.compatible_mode = oracleand queried through Pgpool-II successfully--failure-level WARNgit diff --checkpassesUser impact
Users gain a reproducible path to pool IvorySQL connections and scale reads. The guide intentionally disables automatic failover in the minimal example and lists the fencing, promotion, authentication, and consistency work required before production use.