See https://github.com/phacility/phabricator/issues/716
Relevant trace:
```
[2014-09-01 11:11:26] EXCEPTION: (AphrontQueryException) #1206: The total number of locks exceeds the lock table size at [<phutil>/src/aphront/storage/connection/mysql/AphrontMySQLDatabaseConnectionBase.php:308]
#0 AphrontMySQLDatabaseConnectionBase::throwQueryCodeException(integer, string) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontMySQLDatabaseConnectionBase.php:275]
#1 AphrontMySQLDatabaseConnectionBase::throwQueryException(mysqli) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontMySQLDatabaseConnectionBase.php:181]
#2 AphrontMySQLDatabaseConnectionBase::executeRawQuery(string) called at [<phutil>/src/xsprintf/queryfx.php:6]
#3 queryfx(AphrontMySQLiDatabaseConnection, string, string, string) called at [<phabricator>/src/applications/repository/storage/PhabricatorRepository.php:1123]
#4 PhabricatorRepository::delete() called at [<phabricator>/src/applications/repository/storage/PhabricatorRepository.php:1561]
#5 PhabricatorRepository::destroyObjectPermanently(PhabricatorDestructionEngine) called at [<phabricator>/src/applications/system/engine/PhabricatorDestructionEngine.php:40]
#6 PhabricatorDestructionEngine::destroyObject(PhabricatorRepository) called at [<phabricator>/src/applications/system/management/PhabricatorSystemRemoveDestroyWorkflow.php:98]
#7 PhabricatorSystemRemoveDestroyWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:394]
#8 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:290]
#9 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/setup/manage_remove.php:21]
```
I don't understand the lock limit mechanism and other users haven't hit this.