Disable sqlite lookaside buffers by default.

sql/connection.cc

Index: sql/connection.cc
diff --git a/sql/connection.cc b/sql/connection.cc
index 09d8195df502d440430f8124538733d8a4c776e9..956660ef05b12a665554afee5cda11d2ec63190b 100644
--- a/sql/connection.cc
+++ b/sql/connection.cc
@@ -631,6 +631,12 @@ bool Connection::OpenInternal(const std::string& file_name) {
     return false;
   }
 
+  if (!enable_lookaside_buffer_) {
+    // Disable lookaside buffer. Must be run immediatly after opening the
+    // database before any SQL statements are run.
+    sqlite3_db_config(db_, SQLITE_DBCONFIG_LOOKASIDE, NULL, 0, 0);

[Scott Hess - ex-Googler, 2013/06/05 17:58:49]

And maybe buff up the first line of the comment to indicate why it's being done.
 On the order of "SQLite uses a lookaside buffer to improve performance of small
mallocs.  Chromium already depends on small mallocs being efficient, so disable
this."  Or something like that.

[rmcilroy, 2013/06/05 22:24:47]

Done.

+  }
+
   // sqlite3_open() does not actually read the database file (unless a
   // hot journal is found).  Successfully executing this pragma on an
   // existing database requires a valid header on page 1.