Berkeley DB: DbEnv.log_stat
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DbEnv.log_stat |

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    import com.sleepycat.db.*;

    public DbLogStat log_stat(int flags)
        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 flags value must be set to 0 or the following value:

Db.DB_STAT_CLEAR
  Reset statistics after returning their values.

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_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_disk_offset;
  The byte offset 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_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.
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_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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