37 lines
1.6 KiB
TypeScript
37 lines
1.6 KiB
TypeScript
import type Database from 'better-sqlite3';
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export function tuneConnection(handle: Database.Database, reader = false): void {
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handle.pragma(`cache_size = -${reader ? 32768 : 131072}`);
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// MEMORY also puts VACUUM's transient database in RAM. Disk-backed temps
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// keep migrations and large sorts from growing with the entire database.
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handle.pragma('temp_store = FILE');
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// mmap is opt-in because the controller data directory can be a network mount.
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const mmapMiB = Number(process.env.EC_SQLITE_MMAP_MB ?? 0);
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if (Number.isSafeInteger(mmapMiB) && mmapMiB >= 0 && mmapMiB <= 32768) {
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handle.pragma(`mmap_size = ${mmapMiB * 1024 * 1024}`);
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}
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if (!reader) handle.pragma('journal_size_limit = 67108864');
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}
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/** Startup needs two page caches during VACUUM, plus buffers for legacy files. */
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export function tuneMigrationConnection(handle: Database.Database): void {
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handle.pragma('cache_size = -16384');
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handle.pragma('temp_store = FILE');
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handle.pragma('mmap_size = 0');
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handle.pragma('journal_size_limit = 67108864');
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}
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export function migrationStep<T>(name: string, work: () => T): T {
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const started = Date.now();
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console.info(`[database] migration starting: ${name}`);
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try {
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const result = work();
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console.info(`[database] migration finished: ${name}`, { elapsedMs: Date.now() - started,
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rssMiB: Math.round(process.memoryUsage().rss / 1048576) });
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return result;
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} catch (error) {
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console.error(`[database] migration failed: ${name}`, error);
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throw error;
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}
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}
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