Library Version 11.2.5.2

DbSequence::stat()
Prev | Chapter 12. The DbSequence Handle | Next

## DbSequence::stat()

    #include <db_cxx.h>

    int
    DbSequence::stat(DB_SEQUENCE_STAT **spp, u_int32_t flags);

The `DbSequence::stat()` method creates a statistical structure and copies a pointer to it into user-specified memory locations. Specifically, if spp 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 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.

In the presence of multiple threads or processes accessing an active sequence, the information returned by `DbSequence::stat()` may be out-of-date.

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

- int32_t st_cache_size;

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

- db_seq_t st_current;

  The current value of the sequence in the database.

- u_int32_t st_flags;

  The flags value for 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.

- uintmax_t st_nowait;

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

- db_seq_t st_value;

  The current cached value of the sequence.

- uintmax_t st_wait;

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

### Parameters

#### flags

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

- `DB_STAT_ALL`

  Display all available information.

- `DB_STAT_CLEAR`

  Reset statistics after printing their values.

### Class

DbSequence

### See Also

Sequences and Related Methods

Prev | Up | Next
DbSequence::set_range() | Home | DbSequence::stat_print()