Possible cause of "error saving database"

Possible cause of "error saving database"

Question:
What is the possible cause of error below?

<Log><TM>062908</TM><MT>Error</MT><DB>Contents and DB</DB>
<Msg>error saving database.
</Msg></Log>

Answer:
This can be due to the following causes:
- insufficient space
- no permission
- /usr/local/wa4/wa.db/xxxx.cfg & /usr/local/wa4/wa.db/xxxx.cfg.bak are locked by other process
- The OS system ran out of 'file descriptor' resource

More Information:
The only thing when this happening is the <db>.db and <db>.cfg files are not saved on the hard disk.
The data is still in the memory.
When WAA shuts down, the files will be saved again.

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