Use Client Database-Request Statement Caching directory (-clstmtCacheDir) to specify the location for storing temporary files of statement information that exceeds that specified client statement cache size or the default 256 bytes of shared memory.
Note: Both -clstmtcachedir and -clstmtCacheDir are valid parameter names. However, -clstmtCacheDir is displayed when referring to the Client Database-Request Statement Caching directory startup parameter.
Operating system and syntax UNIX / Windows -clstmtcachedir directory-name
Use with Maximum value Minimum value Single-user default Multi-user default
Client Connection, Database Server N/A N/A N/A N/A
directory-name
A fully-qualified specification for an existing directory. The directory name can be a maximum of 255 bytes. If the directory does not exist, an error is returned and the database does not start.

You can change the name of the directory while the database is running, regardless of whether -clstmtCacheDir was previously set or not.