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