DbEnv.log_stat

APIRef

import com.sleepycat.db.*;

public DbLogStat log_stat(int flags) throws DbException;

Description

The DbEnv.log_stat method returns the logging subsystem statistics.

The flags value must be set to 0 or the following value:

Db.DB_STAT_CLEAR
Reset statistics after returning their values.

The DbEnv.log_stat method creates a DbLogStat object encapsulating the log region statistics. The following data fields are available from the DbLogStat object:

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_size;
The current log file size.
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_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, DbLogc, DbLsn

See Also

Logging Subsystem and Related Methods

APIRef

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