If an H2 database is corrupted you may see following errors:
In the logs:
...Cannot open connection
...
Caused by: java.lang.RuntimeException: page[139109] data leaf table:358 T358 entries:2 parent:144065 keys:[14571, 14572] offsets:[1354, 724] parent 144065 expected 263693
When this happens the browser may return a 503 error
To attempt to recovery the database execute the follwing commands at a windows command prompt. The h2 jar matching the version of the database is required. Either place a copy in C:\ProgramData\QIE\h2 or adjusts the commands below to point to its location.
cd C:\ProgramData\QIE\h2
java -cp h2*.jar org.h2.tools.Recover
mkdir old
move qie.h2.db old\qie.h2.db
move qie.trace.db old\qie.trace.db
java -cp h2*.jar org.h2.tools.RunScript -url jdbc:h2:./qie -user sa -script qie.h2.sql
del qie.h2.sql