# log_stat

`

###

    #include <db.h>

    int
    log_stat(DB_ENV *env, DB_LOG_STAT **spp);

# Description

The log_stat function creates a statistical structure 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 DB_ENV->set_alloc for more information), they are used to allocate the memory; otherwise, the library function malloc(3) 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 log region statistics are stored in a structure of type DB_LOG_STAT. 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.
u_int32_t st_regsize;
  The size of the region.
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_max;
  The maximum size of any individual file comprising the log.
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_cur_offset;
  The byte offset of the last record known to be on disk.
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 log_stat function returns a non-zero error value on failure and 0 on success.

# Errors

The log_stat function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the log_stat function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# See Also

DB_ENV->set_lg_bsize, DB_ENV->set_lg_dir, DB_ENV->set_lg_max, DB_ENV->set_lg_regionmax, log_archive, log_compare, log_file, log_flush, log_get, log_put, log_register, log_stat, and log_unregister.`

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