Speed up MySQL and PostgreSQL per-test database isolation - #253
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MySQL clones now restore a cached dump over JDBC instead of docker exec, with test-oriented server flags. PostgreSQL uses STRATEGY file_copy when supported (15+). Shared per-method drops run asynchronously and hot-path clone logs are demoted to DEBUG to reduce parallel-test overhead.
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Summary
allowMultiQueries) instead ofdocker exec+ shell for every test database; add test-oriented mysqld flags (skip-log-bin,performance-schema=OFF,skip-name-resolve, higher connection/table caches).CREATE DATABASE … STRATEGY file_copyon PostgreSQL 15+ (gated by image major version so older versions such as 14.x keep working).Local
DATABASE_PER_TEST_METHODFastTests benchmarks (100× three cases, parallel) showed roughly ~38% lower wall / ~48% lower avg for MySQL and ~10% / ~19% for PostgreSQL versus the previous baseline. Correctness suites (state guarantees, multi-database including PG 14.7) still pass.Test plan
:mysql:test --tests '*StateGuarantee*' --tests '*MySQLTest*':postgresql:test --tests '*StateGuarantee*' --tests '*lifecycle*' --tests '*MultiDatabase*':mysql:testand:postgresql:test(incl. performance suites)--no-data)