The performance_schema in fact is not a real database but a MySQL feature.
The MySQL manual says that:
Quote:
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Originally Posted by MySQL manual
The MySQL Performance Schema is a feature for monitoring MySQL Server execution at a low level. The Performance Schema is available as of MySQL 5.5.3 and has these characteristics:
- The Performance Schema provides a way to inspect internal execution of the server at runtime. It is implemented using the
storage engine and the performance_schema database. The Performance Schema focuses primarily on performance data. This differs from INFORMATION_SCHEMA, which serves for inspection of metadata.
- ...
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Because of that, its tables can not be handled (i.e. repaired) like normal tables. Just don't mind them, they are not broken.
Your error seams to be rather an issue of the game server. Since the error message doesn't give any clues about the syntax error in the query, it seams like something tried to submit an empty query.
You should probably inspect your quest files for any corrupt function calls and check the quotes (' and ") in the strings.