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Berkeley DB: DbEnv.log_archive
DbEnv.log_archive
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import com.sleepycat.db.*;
public String[] log_archive(int flags)
throws DbException;
Description
The DbEnv.log_archive method
returns an array of log or database filenames.
By default, DbEnv.log_archive returns the names of all of the log
files that are no longer in use (for example, that are no longer
involved in active transactions), and that may safely be archived for
catastrophic recovery and then removed from the system. If there are
no filenames to return,
DbEnv.log_archive returns null.
The flags value must be set to 0 or by bitwise inclusively OR'ing together one or
more of the following values:
- Db.DB_ARCH_ABS
- All pathnames are returned as absolute pathnames, instead of relative
to the database home directory.
- Db.DB_ARCH_DATA
- Return the database files that need to be archived in order to recover
the database from catastrophic failure. If any of the database files
have not been accessed during the lifetime of the current log files,
DbEnv.log_archive will not include them in this list. It is also
possible that some of the files referred to by the log have since been
deleted from the system.
- Db.DB_ARCH_LOG
- Return all the log filenames, regardless of whether or not they are in
use.
The Db.DB_ARCH_DATA and Db.DB_ARCH_LOG flags are mutually
exclusive.
See the db_archive manual page for more information on database
archival procedures.
The DbEnv.log_archive method throws an exception that encapsulates a non-zero error value on
failure.
Bugs
In a threaded application (that is, one where the environment was created
with the DB_THREAD flag specified), calling DbEnv.log_archive with the
DB_ARCH_DATA flag will fail, returning EINVAL. To work around this
problem, reopen the log explicitly without specifying DB_THREAD. This
restriction is expected to be removed in a future version of Berkeley DB.
Errors
The DbEnv.log_archive method may fail and throw an exception encapsulating a non-zero error for the following conditions:
- EINVAL
- An invalid flag value or parameter was specified.
The log was corrupted.
The DbEnv.log_archive method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv.log_archive method may fail and throw
a DbRunRecoveryException, in which case all subsequent Berkeley DB calls
will fail in the same way.
Class
DbEnv
See Also
DbEnv.set_lg_bsize,
DbEnv.set_lg_dir,
DbEnv.set_lg_max,
DbEnv.set_lg_regionmax,
DbEnv.log_archive,
DbEnv.log_compare,
DbEnv.log_file,
DbEnv.log_flush,
DbEnv.log_get,
DbEnv.log_put,
DbEnv.log_register,
DbEnv.log_stat,
and
DbEnv.log_unregister.
Copyright Sleepycat Software
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