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Retire idle persistent MySQL connections

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2026-07-20 13:00:29 +00:00
parent 4d68377704
commit 80eaf0b69b
9 changed files with 182 additions and 11 deletions
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site/doc/pages/request_perf.txt
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@@ -27,7 +27,7 @@ The request log's `wasm-ready`, `wasm`, `workspace`, `invoke`, `collect`, and `p
Workspace birth is subdivided into `birth_policy_us`, `birth_import_us`, `birth_instantiate_us`, `birth_exports_us`, and `birth_initialize_us`. Request-context transfer reports `context_bytes`, `context_encode_us`, `context_allocate_us`, `context_write_us`, `context_guest_apply_us`, and `context_free_us`. These bounded aggregate fields expose sizes and timing only, never request values.
Wasm FastCGI workers retain up to `MYSQL_PERSISTENT_POOL_SIZE` credential-keyed MySQL connections (default `8`; set `0` to disable). UCE calls the client library's connection-reset operation before another request receives a cached connection, clearing transactions, temporary tables, session variables, and selected databases while avoiding a new authentication handshake. Same-request leases continue to share state until request cleanup.
Wasm FastCGI workers retain up to `MYSQL_PERSISTENT_POOL_SIZE` credential-keyed MySQL connections (default `8`; set `0` to disable). `MYSQL_PERSISTENT_POOL_IDLE_TIMEOUT_SECONDS` retires an idle entry at the first later request boundary (default `300`; `0` disables age eviction). UCE calls the client library's connection-reset operation before another request receives a cached connection, clearing transactions, temporary tables, session variables, and selected databases while avoiding a new authentication handshake. Same-request leases continue to share state until request cleanup.
:example
DValue perf = request_perf();