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Berkeley DB: DB_SEQUENCE->stat
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DB_SEQUENCE->stat
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#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stat may be out-of-date.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 method may not be called before the DB_SEQUENCE->open method has
been called.
The DB_SEQUENCE->stat 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
DB_SEQUENCE
See Also
Sequences and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.