Specifies whether to append to or destroy and re-create the derby.log file, which is used to record error and other information when Derby starts up in a JVM.
You can set this property even if the file does not yet exist; Derby creates the file.
By default, the file is deleted and then re-created.
Dynamic or static
This property is static; if you change it while Derby is running, the change does not take effect until you reboot.
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