#include <trx0undo.h>
Data Fields | |
| ulint | id |
| ulint | type |
| ulint | state |
| ibool | del_marks |
| trx_id_t | trx_id |
| XID | xid |
| ibool | dict_operation |
| table_id_t | table_id |
| trx_rseg_t * | rseg |
| ulint | space |
| ulint | zip_size |
| ulint | hdr_page_no |
| ulint | hdr_offset |
| ulint | last_page_no |
| ulint | size |
| ulint | empty |
| ulint | top_page_no |
| ulint | top_offset |
| undo_no_t | top_undo_no |
| buf_block_t * | guess_block |
| ut_list_node< trx_undo_t > | undo_list |
Detailed Description
Transaction undo log memory object; this is protected by the undo_mutex
in the corresponding transaction object
Field Documentation
| ibool trx_undo_t::del_marks |
relevant only in an update undo log: this is TRUE if the transaction may have delete marked records, because of a delete of a row or an update of an indexed field; purge is then necessary; also TRUE if the transaction has updated an externally stored field
| ibool trx_undo_t::dict_operation |
TRUE if a dict operation trx
| ulint trx_undo_t::empty |
TRUE if the stack of undo log records is currently empty
| buf_block_t* trx_undo_t::guess_block |
guess for the buffer block where the top page might reside
| ulint trx_undo_t::hdr_offset |
header offset of the undo log on the page
| ulint trx_undo_t::hdr_page_no |
page number of the header page in the undo log
| ulint trx_undo_t::id |
undo log slot number within the rollback segment
| ulint trx_undo_t::last_page_no |
page number of the last page in the undo log; this may differ from top_page_no during a rollback
| trx_rseg_t* trx_undo_t::rseg |
rseg where the undo log belongs
| ulint trx_undo_t::size |
current size in pages
| ulint trx_undo_t::space |
space id where the undo log placed
| ulint trx_undo_t::state |
state of the corresponding undo log segment
| table_id_t trx_undo_t::table_id |
if a dict operation, then the table id
| ulint trx_undo_t::top_offset |
offset of the latest undo record, i.e., the topmost element in the undo log if we think of it as a stack
| ulint trx_undo_t::top_page_no |
page number where the latest undo log record was catenated; during rollback the page from which the latest undo record was chosen
| undo_no_t trx_undo_t::top_undo_no |
undo number of the latest record
| trx_id_t trx_undo_t::trx_id |
id of the trx assigned to the undo log
| ulint trx_undo_t::type |
TRX_UNDO_INSERT or TRX_UNDO_UPDATE
| ut_list_node< trx_undo_t > trx_undo_t::undo_list |
undo log objects in the rollback segment are chained into lists
| XID trx_undo_t::xid |
X/Open XA transaction identification
| ulint trx_undo_t::zip_size |
compressed page size of space in bytes, or 0 for uncompressed
The documentation for this struct was generated from the following file:
- include/trx0undo.h
