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fix(sqlite): remove cache_size and mmap_size PRAGMAs (#2120)

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A 64 MB page cache plus a 256 MB memory-mapped region inflate RSS and
cause page-cache thrashing on small (~1 GB) instances. The PRAGMAs were
added to reduce event-loop blocking on TraefikConfigManager JOINs but
the memory cost outweighs the I/O benefit on the deployment shapes that
hit #2120. Leave SQLite on its conservative defaults.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Josh Voyles
2026-06-13 14:53:07 -04:00
parent 1860b4b862
commit d94af2b8ea
1 changed files with 3 additions and 7 deletions
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10
server/db/sqlite/driver.ts
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@@ -60,13 +60,9 @@ function createDb() {
// retry loops that accumulate memory.
sqlite.pragma("busy_timeout = 5000");
// 64 MB page cache (default 2 MB) — reduces I/O round-trips on large
// TraefikConfigManager JOINs that block the event loop.
sqlite.pragma("cache_size = -65536");
// 256 MB memory-mapped I/O — OS serves reads from page cache directly,
// reducing event-loop blocking.
sqlite.pragma("mmap_size = 268435456");
// Intentionally NOT setting cache_size or mmap_size: a large page cache plus
// a multi-hundred-MB mmap region inflate RSS and cause page-cache thrashing
// on small (~1 GB) instances. Leave SQLite on its conservative defaults.
// Wrap prepare() so every drizzle-orm statement is auto-finalized after
// first use, preventing sqlite3_stmt accumulation between GC cycles.