From cb11967eac0fc26e1c49aecc0f8ef99cbb685964 Mon Sep 17 00:00:00 2001
From: Rhet Turnbull <rturnbull@gmail.com>
Date: Thu, 10 Feb 2022 22:36:35 -0800
Subject: [PATCH] Implement #629, sqlite performance optimizatons for export db

---
 osxphotos/export_db.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/osxphotos/export_db.py b/osxphotos/export_db.py
index 66b524d3..3e5860a6 100644
--- a/osxphotos/export_db.py
+++ b/osxphotos/export_db.py
@@ -637,6 +637,14 @@ class ExportDB(ExportDB_ABC):
             else:
                 self.was_upgraded = ()
         self.version = OSXPHOTOS_EXPORTDB_VERSION
+
+        # turn on performance optimizations
+        c = conn.cursor()
+        c.execute("PRAGMA journal_mode=WAL;")
+        c.execute("PRAGMA synchronous=NORMAL;")
+        c.execute("PRAGMA cache_size=-100000;")
+        c.execute("PRAGMA temp_store=MEMORY;")
+
         return conn
 
     def _get_db_connection(self, dbfile):