Need help to find out why Websphere Application Server has many .lck files

The file names seesm to point to our WAS data sources. However, we're not sure what is creating them and why there are so many. The servers didn't seem to crash. Why is WAS 6.1.0.23 creating these andy why aren't they being cleaned?

There are many files like these, with some going up to xxx.43.lck DWSqlLog0.0.lck

DWSqlLog0.0

TritonSqlLog0.0.lck

TritonSqlLog0.0

JTSqlLog0.0

JTSqlLog0.1

JTSqlLog0.3

JTSqlLog0.2

开发者_运维百科JTSqlLog0.4.lck JTSqlLog0.4

JTSqlLog0.3.lck

JTSqlLog0.2.lck

JTSqlLog0.1.lck

JTSqlLog0.0.lck

WAS uses JDK Logging and JDK logger creates such files with extension .0,.1 etc along with the .lck file so that the WAS runtime has a lock to these files that it writes to.

Cheers Manglu