Have anybody tried to change the Sqlite3 database to use WAL? Starting from Sqlite 3.7 it can use WAL for the database it has a huge advantage of possibility to run update statements and fetch queries simultaneously. (Which is exactly the problem of DB being locked) Also it is generally faster as requires fewer fsync() calls:    PRAGMA journal_mode=WAL; Also if there are many updates an option:    PARAGMA synchronous=NORMAL; Together with WAL would significantly increase an updates performance (with a price that some of last transactions may be lost in case of computer crash) I'd strongly recommend to try set an WAL option on the database. For more details see: http://www.sqlite.org/wal.html   Artyom Beilis -------------- CppCMS - C++ Web Framework: http://cppcms.sf.net/ CppDB - C++ SQL Connectivity: http://cppcms.sf.net/sql/cppdb/ ----- Original Message -----

From: Steve M. Robbins <steve@sumost.ca> To: boost@lists.boost.org Cc: Sent: Tuesday, December 20, 2011 7:42 AM Subject: [boost] trac error

OperationalError: database is locked

There was an internal error in Trac. It is recommended that you notify your local Trac administrator with the information needed to reproduce the issue.

To that end, you could ==== How to Reproduce ==== While doing a GET operation on `/ticket/6131`, Trac issued an internal error. ''(please provide additional details here)'' Request parameters: {{{ {'id': u'6131'} }}} User agent: `#USER_AGENT#` ==== System Information ==== ''System information not available'' ==== Enabled Plugins ==== ''Plugin information not available'' ==== Python Traceback ==== {{{ Traceback (most recent call last): File "build/bdist.linux-i686/egg/trac/web/main.py", line 513, in _dispatch_request dispatcher.dispatch(req) File "build/bdist.linux-i686/egg/trac/web/main.py", line 258, in dispatch req.session.save() File "build/bdist.linux-i686/egg/trac/web/session.py", line 88, in save @self.env.with_transaction() File "build/bdist.linux-i686/egg/trac/db/api.py", line 77, in transaction_wrapper fn(ldb) File "build/bdist.linux-i686/egg/trac/web/session.py", line 132, in delete_session_cookie """, (self.last_visit, self.sid, authenticated)) File "build/bdist.linux-i686/egg/trac/db/util.py", line 65, in execute return self.cursor.execute(sql_escape_percent(sql), args) File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 78, in execute result = PyFormatCursor.execute(self, *args) File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 56, in execute args or []) File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 48, in _rollback_on_error return function(self, *args, **kwargs) OperationalError: database is locked }}} a ticket.

The action that triggered the error was:

GET: /ticket/6131

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