[Phpwiki-talk] "DB error: table not locked" ?

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Occasionally my users see wikilens.org is broken because a table can't 
be locked. I don't know why. I restart mysql, and it seems okay.

I searched for "DB Error: not locked" and multiple PhpWiki folks seem to 
have encountered this:

http://www.google.com/search?q=+%22DB+Error%3A+not+locked%22&btnG=Search

I tried to search the phpwiki-talk mailing list, and found nothing.

Ideas?

Dan

An example from the Google cache:

lib/PageList.php (In template 'browse') (In template 'body') (In 
template 'html'):495: Warning[512]: PageList: Invalid page_handle 1

/home/groups/p/ph/phpwiki/htdocs/demo/lib/WikiDB/backend/PearDB.php (In 
template 'browse') (In template 'body') (In template 'html'):765: 
Fatal[256]: wikidb_backend_mysql: fatal database error

    * *DB Error: not locked*
    * (UPDATE alpha_session SET sess_data='', sess_date=1081584701,
      sess_ip='64.68.92.173' WHERE
      sess_id='8212367f11d4647bd66396f79c1f1a4f' [nativecode=1100 **
      Table 'alpha_session' was not locked with LOCK TABLES])