Enable WAL for SQLite (#13897)

Signed-off-by: Lorenzo Manacorda <lorenzo@mailbox.org>
matrix-org · Oct 25, 2022 · 8c94dd3 · 8c94dd3
1 parent 19c0e55
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diff --git a/changelog.d/13897.feature b/changelog.d/13897.feature
@@ -0,0 +1 @@
+Enable Write-Ahead Logging for SQLite installs. Contributed by [asymmetric](https://github.com/asymmetric).
diff --git a/synapse/storage/engines/sqlite.py b/synapse/storage/engines/sqlite.py
@@ -88,6 +88,10 @@ def on_new_connection(self, db_conn: "LoggingDatabaseConnection") -> None:
 
         db_conn.create_function("rank", 1, _rank)
         db_conn.execute("PRAGMA foreign_keys = ON;")
+
+        # Enable WAL.
+        # see https://www.sqlite.org/wal.html
+        db_conn.execute("PRAGMA journal_mode = WAL;")
         db_conn.commit()
 
     def is_deadlock(self, error: Exception) -> bool: