#include <db_cxx.h> int DbEnv::log_stat(DB_LOG_STAT **statp, u_int32_t flags);
The DbEnv::log_stat() method returns the logging subsystem
statistics.
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 stored 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 standard C library 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 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 log file size.
uintmax_t st_record;
The number of records written to this 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.
uintmax_t st_wcount;
The number of times the log has been written to disk.
uintmax_t st_wcount_fill;
The number of times the log has been written to disk because the in-memory log record cache filled up.
uintmax_t st_rcount;
The number of times the log has been read from disk.
uintmax_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_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.
roff_t st_regsize;
The size of the log region, in bytes.
uintmax_t st_region_wait;
The number of times that a thread of control was forced to wait before obtaining the log region mutex.
uintmax_t st_region_nowait;
The number of times that a thread of control was able to obtain the log region mutex without waiting.
The DbEnv::log_stat() method may not be called before the
DbEnv::open() method is called.
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.
The flags parameter must be set to 0 or the following value:
The DbEnv::log_stat()
method may fail and throw a DbException
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors: