hsqldb properties

I am using hsqldb which is having the following settings in the properties file (not set by me)

hsqldb.cache_size_scale=8
readonly=false
hsqldb.nio_data_file=true
hsqldb.cache_scale=14
version=1.8.0
hsqldb.default_table_type=memory
hsqldb.cache_file_scale=1
modified=yes
hsqldb.cache_version=1.7.0
hsqldb.original_version=1.8.0
hsqldb.compatible_vers开发者_Go百科ion=1.8.0

The db started giving errors in logs java.sql.SQLException: S1000 General error java.util. NoSuchElementException

Some searching on google pointed me that this is because the limit of the .data file has been reached. The size of the .data file is around 0.7gb. If i increase the cache_file_size , will the above error disappear

hsqldb.default_table_type=memory
hsqldb.cache_file_scale=1

If hsqldb.cache_file_scale=3. Does this mean that database is in memory and will require 3GB. If memory is an issue how can be reduced ?

The current setting allows up to 2GB in the data file.

I suggest you perform a SHUTDOWN SCRIPT to clear up any problems. If you have further problems, contact the HSQLDB project.