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MySQL 8.4.2
Source Code Documentation
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MySQL 8.4.2
Source Code Documentation
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The control structure used in the purge operation. More...
#include <trx0purge.h>
Public Attributes | |
| sess_t * | sess |
| System session running the purge query. More... | |
| trx_t * | trx |
| System transaction running the purge query: this trx is not in the trx list of the trx system and it never ends. More... | |
| rw_lock_t | latch |
| The latch protecting the purge view. More... | |
| os_event_t | event |
| State signal event. More... | |
| ulint | n_stop |
| Counter to track number stops. More... | |
| volatile bool | running |
| true, if purge is active, we check this without the latch too More... | |
| volatile purge_state_t | state |
| Purge coordinator thread states, we check this in several places without holding the latch. More... | |
| que_t * | query |
| The query graph which will do the parallelized purge operation. More... | |
| ReadView | view |
| The purge will not remove undo logs which are >= this view (purge view) More... | |
| ulint | n_submitted |
| Count of total tasks submitted to the task queue. More... | |
| std::atomic< ulint > | n_completed |
| Count of total tasks completed. More... | |
| purge_iter_t | iter |
| Limit up to which we have read and parsed the UNDO log records. More... | |
| purge_iter_t | limit |
| The 'purge pointer' which advances during a purge, and which is used in history list truncation. More... | |
| purge_iter_t | done |
| Indicate 'purge pointer' which have purged already accurately. More... | |
| bool | next_stored |
| true if the info of the next record to purge is stored below: if yes, then the transaction number and the undo number of the record are stored in purge_trx_no and purge_undo_no above More... | |
| trx_rseg_t * | rseg |
| Rollback segment for the next undo record to purge. More... | |
| page_no_t | page_no |
| Page number for the next undo record to purge, page number of the log header, if dummy record. More... | |
| ulint | offset |
| Page offset for the next undo record to purge, 0 if the dummy record. More... | |
| page_no_t | hdr_page_no |
| Header page of the undo log where the next record to purge belongs. More... | |
| ulint | hdr_offset |
| Header byte offset on the page. More... | |
| TrxUndoRsegsIterator * | rseg_iter |
| Iterator to get the next rseg to process. More... | |
| purge_pq_t * | purge_queue |
| Binary min-heap, ordered on TrxUndoRsegs::trx_no. More... | |
| PQMutex | pq_mutex |
| Mutex protecting purge_queue. More... | |
| undo::Truncate | undo_trunc |
| Track UNDO tablespace marked for truncate. More... | |
| mem_heap_t * | heap |
| Heap for reading the undo log records. More... | |
| std::vector< trx_rseg_t * > | rsegs_queue |
| Set of all rseg queue. More... | |
Static Public Attributes | |
| static thread_local bool | is_this_a_purge_thread {false} |
| Is the this thread related to purge? This is false by default and set to true by srv_purge_coordinator_thread() and srv_worker_thread() only. More... | |
The control structure used in the purge operation.
| purge_iter_t trx_purge_t::done |
Indicate 'purge pointer' which have purged already accurately.
| os_event_t trx_purge_t::event |
State signal event.
| ulint trx_purge_t::hdr_offset |
Header byte offset on the page.
| page_no_t trx_purge_t::hdr_page_no |
Header page of the undo log where the next record to purge belongs.
| mem_heap_t* trx_purge_t::heap |
Heap for reading the undo log records.
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inlinestatic |
Is the this thread related to purge? This is false by default and set to true by srv_purge_coordinator_thread() and srv_worker_thread() only.
| purge_iter_t trx_purge_t::iter |
Limit up to which we have read and parsed the UNDO log records.
Not necessarily purged from the indexes. Note that this can never be less than the limit below, we check for this invariant in trx0purge.cc
| rw_lock_t trx_purge_t::latch |
The latch protecting the purge view.
A purge operation must acquire an x-latch here for the instant at which it changes the purge view: an undo log operation can prevent this by obtaining an s-latch here. It also protects state and running
| purge_iter_t trx_purge_t::limit |
The 'purge pointer' which advances during a purge, and which is used in history list truncation.
| std::atomic<ulint> trx_purge_t::n_completed |
Count of total tasks completed.
| ulint trx_purge_t::n_stop |
Counter to track number stops.
| ulint trx_purge_t::n_submitted |
Count of total tasks submitted to the task queue.
| bool trx_purge_t::next_stored |
true if the info of the next record to purge is stored below: if yes, then the transaction number and the undo number of the record are stored in purge_trx_no and purge_undo_no above
| ulint trx_purge_t::offset |
Page offset for the next undo record to purge, 0 if the dummy record.
| page_no_t trx_purge_t::page_no |
Page number for the next undo record to purge, page number of the log header, if dummy record.
| PQMutex trx_purge_t::pq_mutex |
Mutex protecting purge_queue.
| purge_pq_t* trx_purge_t::purge_queue |
Binary min-heap, ordered on TrxUndoRsegs::trx_no.
It is protected by the pq_mutex
| que_t* trx_purge_t::query |
The query graph which will do the parallelized purge operation.
| trx_rseg_t* trx_purge_t::rseg |
Rollback segment for the next undo record to purge.
| TrxUndoRsegsIterator* trx_purge_t::rseg_iter |
Iterator to get the next rseg to process.
| std::vector<trx_rseg_t *> trx_purge_t::rsegs_queue |
Set of all rseg queue.
| volatile bool trx_purge_t::running |
true, if purge is active, we check this without the latch too
| sess_t* trx_purge_t::sess |
System session running the purge query.
| volatile purge_state_t trx_purge_t::state |
Purge coordinator thread states, we check this in several places without holding the latch.
| trx_t* trx_purge_t::trx |
System transaction running the purge query: this trx is not in the trx list of the trx system and it never ends.
| undo::Truncate trx_purge_t::undo_trunc |
Track UNDO tablespace marked for truncate.
| ReadView trx_purge_t::view |
The purge will not remove undo logs which are >= this view (purge view)
1.9.2