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Merge pull request #10301 from a-n-n-a-l-e-e/wal-persist

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enable persistent WAL mode for sqlite db
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Eelco Dolstra 2024-04-02 12:02:12 +02:00 committed by GitHub
parent 911febe56c 7205a6bbc9
commit bb5764e578
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1 changed files with 13 additions and 0 deletions
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13
src/libstore/local-store.cc
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@ -553,6 +553,19 @@ void LocalStore::openDB(State & state, bool create)
sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
SQLiteError::throw_(db, "setting journal mode");
if (mode == "wal") {
/* persist the WAL files when the db connection is closed. This allows
for read-only connections without write permissions on the
containing directory to succeed on a closed db. Setting the
journal_size_limit to 2^40 bytes results in the WAL files getting
truncated to 0 on exit and limits the on disk size of the WAL files
to 2^40 bytes following a checkpoint */
if (sqlite3_exec(db, "pragma main.journal_size_limit = 1099511627776;", 0, 0, 0) == SQLITE_OK) {
int enable = 1;
sqlite3_file_control(db, NULL, SQLITE_FCNTL_PERSIST_WAL, &enable);
}
}
/* Increase the auto-checkpoint interval to 40000 pages. This
seems enough to ensure that instantiating the NixOS system
derivation is done in a single fsync(). */