row0purge.h
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- /******************************************************
- Purge obsolete records
- (c) 1997 Innobase Oy
- Created 3/14/1997 Heikki Tuuri
- *******************************************************/
- #ifndef row0purge_h
- #define row0purge_h
- #include "univ.i"
- #include "data0data.h"
- #include "btr0types.h"
- #include "btr0pcur.h"
- #include "dict0types.h"
- #include "trx0types.h"
- #include "que0types.h"
- #include "row0types.h"
-
- /************************************************************************
- Creates a purge node to a query graph. */
- purge_node_t*
- row_purge_node_create(
- /*==================*/
- /* out, own: purge node */
- que_thr_t* parent, /* in: parent node, i.e., a thr node */
- mem_heap_t* heap); /* in: memory heap where created */
- /***************************************************************
- Does the purge operation for a single undo log record. This is a high-level
- function used in an SQL execution graph. */
- que_thr_t*
- row_purge_step(
- /*===========*/
- /* out: query thread to run next or NULL */
- que_thr_t* thr); /* in: query thread */
- /* Purge node structure */
- struct purge_node_struct{
- que_common_t common; /* node type: QUE_NODE_PURGE */
- /*----------------------*/
- /* Local storage for this graph node */
- dulint roll_ptr;/* roll pointer to undo log record */
- trx_undo_rec_t* undo_rec;/* undo log record */
- trx_undo_inf_t* reservation;/* reservation for the undo log record in
- the purge array */
- dulint undo_no;/* undo number of the record */
- ulint rec_type;/* undo log record type: TRX_UNDO_INSERT_REC,
- ... */
- btr_pcur_t pcur; /* persistent cursor used in searching the
- clustered index record */
- ibool found_clust;/* TRUE if the clustered index record
- determined by ref was found in the clustered
- index, and we were able to position pcur on
- it */
- dict_table_t* table; /* table where purge is done; NOTE that the
- table has to be released explicitly with
- dict_table_release */
- ulint cmpl_info;/* compiler analysis info of an update */
- upd_t* update; /* update vector for a clustered index record */
- dtuple_t* ref; /* NULL, or row reference to the next row to
- handle */
- dtuple_t* row; /* NULL, or a copy (also fields copied to
- heap) of the indexed fields of the row to
- handle */
- dict_index_t* index; /* NULL, or the next index whose record should
- be handled */
- mem_heap_t* heap; /* memory heap used as auxiliary storage for
- row; this must be emptied after a successful
- purge of a row */
- };
- #ifndef UNIV_NONINL
- #include "row0purge.ic"
- #endif
- #endif