Queue Statistics
In the case of a Queue database, the statistics are stored in a structure of type DB_QUEUE_STAT. The following fields will be filled in:
- u_int32_t qs_magic*
- Magic number that identifies the file as a Queue file.
- u_int32_t qs_version*
- The version of the Queue file type.
- u_int32_t qs_nkeys*
- The number of records in the database. If DB_FAST_STAT was specified the count will be the last saved value unless it has never been calculated, in which case it will be 0.
- u_int32_t qs_ndata*
- The number of records in the database. If DB_FAST_STAT was specified the count will be the last saved value unless it has never been calculated, in which case it will be 0.
- u_int32_t qs_pagesize*
- Underlying database page size, in bytes.
- u_int32_t qs_extentsize*
- Underlying database extent size, in pages.
- u_int32_t qs_pages
- Number of pages in the database.
- u_int32_t qs_re_len*
- The length of the records.
- u_int32_t qs_re_pad*
- The padding byte value for the records.
- u_int32_t qs_pgfree
- Number of bytes free in database pages.
- u_int32_t qs_start
- Start offset.
- u_int32_t qs_first_recno*
- First undeleted record in the database.
- u_int32_t qs_cur_recno*
- Last allocated record number in the database.
The Db::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.
Errors
The Db::stat method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the Db::stat method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
Class
DbSee Also
Db::associate, Db::close, Db::cursor, Db::del, Db::err, Db::errx Db::fd, Db::get, Db::pget, Db::get_byteswapped, Db::get_type, Db::join, Db::key_range, Db::open, Db::put, Db::remove, Db::rename, Db::set_alloc, Db::set_append_recno, Db::set_bt_compare, Db::set_bt_minkey, Db::set_bt_prefix, Db::set_cachesize, Db::set_dup_compare, Db::set_errcall, Db::set_errfile, Db::set_errpfx, Db::set_feedback, Db::set_flags, Db::set_h_ffactor, Db::set_h_hash, Db::set_h_nelem, Db::set_lorder, Db::set_pagesize, Db::set_paniccall, Db::set_q_extentsize, Db::set_re_delim, Db::set_re_len, Db::set_re_pad, Db::set_re_source, Db::stat, Db::sync, Db::truncate, Db::upgrade, and Db::verify.
 
|