When a data or index file is closed, the c-tree server will flush updated cache pages and set the update flag of the file to zero under the following conditions:
The file does not use the full transaction logging (ctTRNLOG) filemode.
No other users have the file opened.
The KEEPOPEN_LIST option is set to keep the file open.
The configuration option KEEPOPEN_FLUSH YES in ctsrvr.cfg is set..
