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Berkeley DB: DbEnv.log_stat
DbEnv.log_stat
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import com.sleepycat.db.*;
public DbLogStat log_stat()
throws DbException;
Description
The DbEnv.log_stat method
creates a DbLogStat object encapsulating a statistical structure.
The log region statistics are stored in a DbLogStat object.
The following data fields are available from the DbLogStat object:
The log region statistics are stored in a structure of type DB_LOG_STAT.
The following DB_LOG_STAT fields will be filled in:
- public int st_magic;
- The magic number that identifies a file as a log file.
- public int st_version;
- The version of the log file type.
- public int st_regsize;
- The size of the region.
- public int st_mode;
- The mode of any created log files.
- public int st_lg_bsize;
- The in-memory log record cache size.
- public int st_lg_max;
- The maximum size of any individual file comprising the log.
- public int st_w_mbytes;
- The number of megabytes written to this log.
- public int st_w_bytes;
- The number of bytes over and above st_w_mbytes written to this log.
- public int st_wc_mbytes;
- The number of megabytes written to this log since the last checkpoint.
- public int st_wc_bytes;
- The number of bytes over and above st_wc_mbytes written to this log
since the last checkpoint.
- public int st_wcount;
- The number of times the log has been written to disk.
- public int st_wcount_fill;
- The number of times the log has been written to disk because the
in-memory log record cache filled up.
- public int st_scount;
- The number of times the log has been flushed to disk.
- public int st_cur_file;
- The current log file number.
- public int st_cur_offset;
- The byte offset in the current log file.
- public int st_disk_file;
- The log file number of the last record known to be on disk.
- public int st_cur_offset;
- The byte offset of the last record known to be on disk.
- public int st_region_wait;
- The number of times that a thread of control was forced to wait before
obtaining the region lock.
- public int st_region_nowait;
- The number of times that a thread of control was able to obtain
the region lock without waiting.
The DbEnv.log_stat method throws an exception that encapsulates a non-zero error value on
failure.
Errors
The DbEnv.log_stat 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_stat 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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public DbLogStat log_stat(int flags)
throws DbException;
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The flags value must be set to 0 or
the following value:
- Db.DB_STAT_CLEAR
- Reset statistics after returning their values.
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public int st_disk_offset;The byte offset of the last record known to be on disk.
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public int st_flushcommit;The number of log flushes that contained a transaction commit record.
public int st_maxcommitperflush;The maximum number of commits contained in a single log flush.
public int st_mincommitperflush;The minimum number of commits contained in a single log flush that
contained a commit.]
public int st_regsize;The size of the region.
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DbEnv.log_cursor,
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DbEnv.log_unregister,
DbLogc.logc_close
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DbLogc.logc_get.
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The DbEnv.log_stat method returns the logging subsystem statistics.
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The DbEnv.log_stat method creates a DbLogStat object encapsulating the log
region statistics. The following data fields are available from the
DbLogStat object:
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public int st_lg_size;The current log file size.
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If a catastrophic error has occurred, the DbEnv.log_stat method may fail and
throw a DbRunRecoveryException,
in which case all subsequent Berkeley DB calls will fail in the same way.
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DbEnv, DbLogc, DbLsn
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Logging Subsystem and Related Methods
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The DbEnv.log_stat method
creates a DbLogStat object encapsulating a statistical structure.
The log region statistics are stored in a DbLogStat object.
The following data fields are available from the DbLogStat object:
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The log region statistics are stored in a structure of type DB_LOG_STAT.
The following DB_LOG_STAT fields will be filled in:
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public int st_lg_max;The maximum size of any individual file comprising the log.
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public int st_flushcommit;The number of log flushes that contained a transaction commit record.
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If a catastrophic error has occurred, the DbEnv.log_stat method may fail and throw
a DbRunRecoveryException, in which case all subsequent Berkeley DB calls
will fail in the same way.
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DbEnv
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DbEnv.set_lg_bsize,
DbEnv.set_lg_dir,
DbEnv.set_lg_max,
DbEnv.set_lg_regionmax,
DbEnv.log_archive,
DbEnv.log_compare,
DbEnv.log_cursor,
DbEnv.log_file,
DbEnv.log_flush,
DbEnv.log_put,
DbEnv.log_register,
DbEnv.log_stat,
DbEnv.log_unregister,
DbLogc.logc_close
and
DbLogc.logc_get.
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The DbEnv.log_stat method returns the logging subsystem statistics.
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The DbEnv.log_stat method creates a DbLogStat object encapsulating the log
region statistics. The following data fields are available from the
DbLogStat object:
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public int st_lg_size;The current log file size.
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If a catastrophic error has occurred, the DbEnv.log_stat method may fail and
throw a DbRunRecoveryException,
in which case all subsequent Berkeley DB calls will fail in the same way.
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DbEnv, DbLogc, DbLsn
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Logging Subsystem and Related Methods
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