In some cases, the firebird database may be blocked and not opened simultaneously with another firebird version. In order to solve the problem,at the folder:
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C:\Program Files (x86)\Firebird\Firebird_2_5\bin |
Execute the commands:
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gfix.exe -shut full -force 0 -user SYSDBA -pas masterkey "database.fdb" |
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gfix.exe -online "database.fdb" -user SYSDBA -password masterkey |