Struct MDBX_defrag_result_t
ClassList > MDBX_defrag_result_t
The numerical metrics of progress and result of database defragmentation. More...
#include <mdbx.h>
Public Attributes
| Type | Name |
|---|---|
| unsigned | cycles |
| size_t | obstructed_pgno |
| size_t | obstructed_span |
| uint64_t | obstructed_txnid |
| mdbx_pid_t | obstructor_pid |
| mdbx_tid_t | obstructor_tid |
| size_t | pages_left |
| size_t | pages_moved |
| size_t | pages_retained |
| size_t | pages_scheduled |
| intptr_t | pages_shrinked |
| size_t | pages_whole |
| unsigned | rough_estimation_cycle_progress_permille |
| size_t | spent_time_dot16 |
| unsigned | stopping_reasons |
Detailed Description
See also: mdbx_env_defrag()
See also: MDBX_defrag_notify_func
Public Attributes Documentation
variable cycles
unsigned MDBX_defrag_result_t::cycles;
The number of defragmentation cycles.
variable obstructed_pgno
size_t MDBX_defrag_result_t::obstructed_pgno;
The number of the page where the defragmentation stumbled, according to the reasons given in the stopping_reasons field.
variable obstructed_span
size_t MDBX_defrag_result_t::obstructed_span;
The length of the large/overflow-page span where the defragmentation stumbled, according to the reasons given in the stopping_reasons field.
variable obstructed_txnid
uint64_t MDBX_defrag_result_t::obstructed_txnid;
The transaction number corresponds to the earliest/first MVCC-snapshot held by reader(s) and preventing defragmentation.
variable obstructor_pid
mdbx_pid_t MDBX_defrag_result_t::obstructor_pid;
The system/native Process ID of one of a readers holding the MVCC snapshot that prevents defragmentation.
variable obstructor_tid
mdbx_tid_t MDBX_defrag_result_t::obstructor_tid;
The system/native Thread ID of one of a readers holding the MVCC snapshot that prevents defragmentation.
variable pages_left
size_t MDBX_defrag_result_t::pages_left;
The estimated remaining number of pages that are potentially defragmented.
variable pages_moved
size_t MDBX_defrag_result_t::pages_moved;
The total number of pages moved during defragmentation.
variable pages_retained
size_t MDBX_defrag_result_t::pages_retained;
The number of pages held by other processes via reading MVCC-snapshots that prevent reclaiming and defragmentation.
variable pages_scheduled
size_t MDBX_defrag_result_t::pages_scheduled;
The number of pages scheduled to be moved at the next stage of the current defragmentation cycle.
variable pages_shrinked
intptr_t MDBX_defrag_result_t::pages_shrinked;
The number of pages that the database size was shrinked by. In the worst case, this value can be negative, for instance -1, when defragmentation was stopped for some reason, or the database structure does not allow it to be defragmented by moving individual pages.
variable pages_whole
size_t MDBX_defrag_result_t::pages_whole;
The whole number of pages in the database.
variable rough_estimation_cycle_progress_permille
unsigned MDBX_defrag_result_t::rough_estimation_cycle_progress_permille;
Rough estimation a progress of the current defragmentation cycle in permilles (the 1000 means 100%).
variable spent_time_dot16
size_t MDBX_defrag_result_t::spent_time_dot16;
The time elapsed since the beginning of defragmentation in a 1/65536 second fractions.
variable stopping_reasons
unsigned MDBX_defrag_result_t::stopping_reasons;
Obstacles and reasons for stopping defragmentation in the form of a mask of OR'ed MDBX_defrag_stopping_reasons_t bits.
The documentation for this class was generated from the following file docs/mdbx.h