#include <db.h>

int
DB_SEQUENCE->stat(DB_SEQUENCE *db, void *sp, u_int32_t flags);

int
DB_SEQUENCE->stat_print(DB_SEQUENCE *db, u_int32_t flags);

Description: DB_SEQUENCE->stat

The DB_SEQUENCE->stat method creates a statistical structure and copies a pointer to it into user-specified memory locations. Specifically, if sp is non-NULL, a pointer to the statistics for the database are copied into the memory location to which it refers.

Statistical structures are stored 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 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.

In the presence of multiple threads or processes accessing an active sequence, the information returned by DB_SEQUENCE->stat may be out-of-date.

The DB_SEQUENCE->stat method cannot be transaction-protected. For this reason, it should be called in a thread of control that has no open cursors or active transactions.

The statistics are stored in a structure of type DB_SEQUENCE_STAT. The following fields will be filled in:

u_int32_t st_wait;

The number of times a thread of control was forced to wait on the handle mutex.

u_int32_t st_nowait;

The number of times that a thread of control was able to obtain handle mutex without waiting.

db_seq_t st_current;

The current value of the sequence in the database.

db_seq_t st_value;

The current cached value of the sequence.

db_seq_t st_last_value;

The last cached value of the sequence.

db_seq_t st_min;

The minimum permitted value of the sequence.

db_seq_t st_max;

The maximum permitted value of the sequence.

int32_t st_cache_size;

The number of values that will be cached in this handle.

u_int32_t st_flags;

The flags value for the sequence.

Parameters

flags

The flags parameter must be set by bitwise inclusively OR'ing together one or more of the following values:

DB_STAT_CLEAR

Reset statistics after printing their values.

The DB_SEQUENCE->stat_print method returns a non-zero error value on failure and 0 on success.

Description: DB_SEQUENCE->stat_print

The DB_SEQUENCE->stat_print method prints diagnostic information to the output channel described by the DB_ENV->set_msgfile method.

Parameters

flags

The flags parameter must be set by bitwise inclusively OR'ing together one or more of the following values:

DB_STAT_CLEAR

Reset statistics after printing their values.

Class

See Also