Firebird Documentation IndexGfix - Database Housekeeping → Command Line Options
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Command Line Options

Running gfix without a command (or an invalid command), or with the new -? switch in Firebird 2.5, results in the following screen of helpful information being displayed:

usage: gfix [options] <database>
plausible options are:
        -activate       activate shadow file for database usage
        -attach         shutdown new database attachments
        -buffers        set page buffers <n>
        -commit         commit transaction <tr / all>
        -cache          shutdown cache manager
        -full           validate record fragments (-v)
        -force          force database shutdown
        -fetch_password fetch_password from file
        -housekeeping   set sweep interval <n>
        -ignore         ignore checksum errors
        -kill           kill all unavailable shadow files
        -list           show limbo transactions
        -mend           prepare corrupt database for backup
        -mode           read_only or read_write
        -no_update      read-only validation (-v)
        -online         database online <single / multi / normal>
        -prompt         prompt for commit/rollback (-l)
        -password       default password
        -rollback       rollback transaction <tr / all>
        -sql_dialect    set database dialect n
        -sweep          force garbage collection
        -shut           shutdown <full / single / multi>
        -two_phase      perform automated two-phase recovery
        -tran           shutdown transaction startup
        -use            use full or reserve space for versions
        -user           default user name
        -validate       validate database structure
        -write          write synchronously or asynchronously
        -z              print software version number

    qualifiers show the major option in parenthesis
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Firebird Documentation IndexGfix - Database Housekeeping → Command Line Options