/***************************************************************************** Copyright (c) 1997, 2016, Oracle and/or its affiliates. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA *****************************************************************************/ /**************************************************//** @file include/row0vers.h Row versions Created 2/6/1997 Heikki Tuuri *******************************************************/ #ifndef row0vers_h #define row0vers_h #include "univ.i" #include "data0data.h" #include "dict0types.h" #include "trx0types.h" #include "que0types.h" #include "rem0types.h" #include "mtr0mtr.h" #include "dict0mem.h" // Forward declaration class ReadView; /*****************************************************************//** Finds out if an active transaction has inserted or modified a secondary index record. @return 0 if committed, else the active transaction id; NOTE that this function can return false positives but never false negatives. The caller must confirm all positive results by calling trx_is_active() while holding lock_sys->mutex. */ trx_t* row_vers_impl_x_locked( /*===================*/ const rec_t* rec, /*!< in: record in a secondary index */ dict_index_t* index, /*!< in: the secondary index */ const ulint* offsets);/*!< in: rec_get_offsets(rec, index) */ /*****************************************************************//** Finds out if we must preserve a delete marked earlier version of a clustered index record, because it is >= the purge view. @param[in] trx_id transaction id in the version @param[in] name table name @param[in,out] mtr mini transaction holding the latch on the clustered index record; it will also hold the latch on purge_view @return TRUE if earlier version should be preserved */ ibool row_vers_must_preserve_del_marked( /*==============================*/ trx_id_t trx_id, const table_name_t& name, mtr_t* mtr); /*****************************************************************//** Finds out if a version of the record, where the version >= the current purge view, should have ientry as its secondary index entry. We check if there is any not delete marked version of the record where the trx id >= purge view, and the secondary index entry == ientry; exactly in this case we return TRUE. @return TRUE if earlier version should have */ ibool row_vers_old_has_index_entry( /*=========================*/ ibool also_curr,/*!< in: TRUE if also rec is included in the versions to search; otherwise only versions prior to it are searched */ const rec_t* rec, /*!< in: record in the clustered index; the caller must have a latch on the page */ mtr_t* mtr, /*!< in: mtr holding the latch on rec; it will also hold the latch on purge_view */ dict_index_t* index, /*!< in: the secondary index */ const dtuple_t* ientry, /*!< in: the secondary index entry */ roll_ptr_t roll_ptr,/*!< in: roll_ptr for the purge record */ trx_id_t trx_id);/*!< in: transaction ID on the purging record */ /*****************************************************************//** Constructs the version of a clustered index record which a consistent read should see. We assume that the trx id stored in rec is such that the consistent read should not see rec in its present version. @return DB_SUCCESS or DB_MISSING_HISTORY */ dberr_t row_vers_build_for_consistent_read( /*===============================*/ const rec_t* rec, /*!< in: record in a clustered index; the caller must have a latch on the page; this latch locks the top of the stack of versions of this records */ mtr_t* mtr, /*!< in: mtr holding the latch on rec; it will also hold the latch on purge_view */ dict_index_t* index, /*!< in: the clustered index */ ulint** offsets,/*!< in/out: offsets returned by rec_get_offsets(rec, index) */ ReadView* view, /*!< in: the consistent read view */ mem_heap_t** offset_heap,/*!< in/out: memory heap from which the offsets are allocated */ mem_heap_t* in_heap,/*!< in: memory heap from which the memory for *old_vers is allocated; memory for possible intermediate versions is allocated and freed locally within the function */ rec_t** old_vers,/*!< out, own: old version, or NULL if the history is missing or the record does not exist in the view, that is, it was freshly inserted afterwards */ const dtuple_t**vrow); /*!< out: reports virtual column info if any */ /*****************************************************************//** Constructs the last committed version of a clustered index record, which should be seen by a semi-consistent read. */ void row_vers_build_for_semi_consistent_read( /*====================================*/ const rec_t* rec, /*!< in: record in a clustered index; the caller must have a latch on the page; this latch locks the top of the stack of versions of this records */ mtr_t* mtr, /*!< in: mtr holding the latch on rec */ dict_index_t* index, /*!< in: the clustered index */ ulint** offsets,/*!< in/out: offsets returned by rec_get_offsets(rec, index) */ mem_heap_t** offset_heap,/*!< in/out: memory heap from which the offsets are allocated */ mem_heap_t* in_heap,/*!< in: memory heap from which the memory for *old_vers is allocated; memory for possible intermediate versions is allocated and freed locally within the function */ const rec_t** old_vers,/*!< out: rec, old version, or NULL if the record does not exist in the view, that is, it was freshly inserted afterwards */ const dtuple_t**vrow); /*!< out: holds virtual column info if any is updated in the view */ #endif