#include <db_cxx.h>

int
DbEnv::log_stat(DB_LOG_STAT **spp, u_int32_t flags);

Description

The DbEnv::log_stat method returns the logging subsystem statistics.

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

DB_STAT_CLEAR

Reset statistics after returning their values.

The DbEnv::log_stat method creates a statistical structure of type DB_LOG_STAT and copies a pointer to it into a user-specified memory location.

Statistical structures are created in allocated memory. If application-specific allocation routines have been declared (see DbEnv::set_alloc for more information), they are used to allocate the memory; otherwise, the library malloc(3) interface is used. The caller is responsible for deallocating the memory. To deallocate the memory, free the memory reference; references inside the returned memory need not be individually freed.

The following DB_LOG_STAT fields will be filled in:

u_int32_t st_magic;

The magic number that identifies a file as a log file.

u_int32_t st_version;

The version of the log file type.

int st_mode;

The mode of any created log files.

u_int32_t st_lg_bsize;

The in-memory log record cache size.

u_int32_t st_lg_size;

The current log file size.

u_int32_t st_w_mbytes;

The number of megabytes written to this log.

u_int32_t st_w_bytes;

The number of bytes over and above st_w_mbytes written to this log.

u_int32_t st_wc_mbytes;

The number of megabytes written to this log since the last checkpoint.

u_int32_t st_wc_bytes;

The number of bytes over and above st_wc_mbytes written to this log since the last checkpoint.

u_int32_t st_wcount;

The number of times the log has been written to disk.

u_int32_t st_wcount_fill;

The number of times the log has been written to disk because the in-memory log record cache filled up.

u_int32_t st_scount;

The number of times the log has been flushed to disk.

u_int32_t st_cur_file;

The current log file number.

u_int32_t st_cur_offset;

The byte offset in the current log file.

u_int32_t st_disk_file;

The log file number of the last record known to be on disk.

u_int32_t st_disk_offset;

The byte offset of the last record known to be on disk.

u_int32_t st_cur_offset;

The byte offset of the last record known to be on disk.

u_int32_t st_maxcommitperflush;

The maximum number of commits contained in a single log flush.

u_int32_t st_mincommitperflush;

The minimum number of commits contained in a single log flush that contained a commit.]

u_int32_t st_regsize;

The size of the region.

u_int32_t st_region_wait;

The number of times that a thread of control was forced to wait before obtaining the region lock.

u_int32_t 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 either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

Errors

The DbEnv::log_stat method may fail and throw an exception or return a non-zero error 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 either return DB_RUNRECOVERY or throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.

Class

See Also