64 lines
2.5 KiB
Plaintext
64 lines
2.5 KiB
Plaintext
/*****************************************************************************
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Copyright (c) 1996, 2018, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License, version 2.0, as published by the
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Free Software Foundation.
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This program is also distributed with certain software (including but not
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limited to OpenSSL) that is licensed under separate terms, as designated in a
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particular file or component or in included license documentation. The authors
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of MySQL hereby grant you an additional permission to link the program and
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your derivative works with the separately licensed software that they have
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included with MySQL.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
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for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*****************************************************************************/
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/** @file include/trx0purge.ic
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Purge old versions
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#include "trx0undo.h"
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/** Calculates the file address of an undo log header when we have the file
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address of its history list node.
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@return file address of the log */
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UNIV_INLINE
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fil_addr_t trx_purge_get_log_from_hist(
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fil_addr_t node_addr) /*!< in: file address of the history
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list node of the log */
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{
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node_addr.boffset -= TRX_UNDO_HISTORY_NODE;
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return (node_addr);
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}
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/** address of its history list node.
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@return true if purge_sys_t::limit <= purge_sys_t::iter */
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UNIV_INLINE
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bool trx_purge_check_limit(void) {
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/* limit is used to track till what point purge element has been
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processed and so limit <= iter.
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undo_no ordering is enforced only within the same rollback segment.
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If a transaction uses multiple rollback segments then we need to
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consider the rollback segment space id too. */
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return (purge_sys->iter.scn > purge_sys->limit.scn ||
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(purge_sys->iter.scn == purge_sys->limit.scn &&
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((purge_sys->iter.undo_no >= purge_sys->limit.undo_no) ||
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(purge_sys->iter.undo_rseg_space !=
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purge_sys->limit.undo_rseg_space))));
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}
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