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Increase SQLite's auto-checkpoint interval

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Common operations like instantiating a NixOS system config no longer
fitted in 8192 pages, leading to more fsyncs.  So increase this limit.
This commit is contained in:
Eelco Dolstra 2013-06-20 14:01:33 +00:00
parent 9b11165aec
commit 1906cce6fc
1 changed files with 2 additions and 2 deletions
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4
src/libstore/local-store.cc
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@ -380,10 +380,10 @@ void LocalStore::openDB(bool create)
sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK) sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
throwSQLiteError(db, "setting journal mode"); throwSQLiteError(db, "setting journal mode");
/* Increase the auto-checkpoint interval to 8192 pages. This /* Increase the auto-checkpoint interval to 40000 pages. This
seems enough to ensure that instantiating the NixOS system seems enough to ensure that instantiating the NixOS system
derivation is done in a single fsync(). */ derivation is done in a single fsync(). */
if (mode == "wal" && sqlite3_exec(db, "pragma wal_autocheckpoint = 8192;", 0, 0, 0) != SQLITE_OK) if (mode == "wal" && sqlite3_exec(db, "pragma wal_autocheckpoint = 40000;", 0, 0, 0) != SQLITE_OK)
throwSQLiteError(db, "setting autocheckpoint interval"); throwSQLiteError(db, "setting autocheckpoint interval");
/* Initialise the database schema, if necessary. */ /* Initialise the database schema, if necessary. */