109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
/* Copyright (c) 2018, 2021, Alibaba and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL/PolarDB-X Engine hereby grant you an
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additional permission to link the program and your derivative works with the
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separately licensed software that they have included with
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MySQL/PolarDB-X Engine.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/** @file include/lizard0scn0hist.h
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Lizard INNODB_FLASHBACK_SNAPSHOT system table.
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Created 2020-09-22 by Jianwei.zhao
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*******************************************************/
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#ifndef lizard0scn0hist_h
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#define lizard0scn0hist_h
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#include "univ.i"
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#include "db0err.h"
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#include "os0event.h"
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#include "lizard0scn0types.h"
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#ifdef UNIV_PFS_THREAD
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extern mysql_pfs_key_t scn_history_thread_key;
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#endif
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namespace dd {
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class Object_table;
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} // namespace dd
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/** SCN history table named "INNODB_FLASHBACK_SNAPSHOT" */
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#define SCN_HISTORY_TABLE_NAME "innodb_flashback_snapshot"
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#define SCN_HISTORY_TABLE_FULL_NAME "mysql/innodb_flashback_snapshot"
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/** Transformation state between scn and utc */
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enum class SCN_TRANSFORM_STATE { NOT_FOUND, SUCCESS };
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/** Transformation result between scn and utc */
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struct scn_transform_result_t {
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scn_t scn;
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ulint utc;
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SCN_TRANSFORM_STATE state;
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dberr_t err;
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scn_transform_result_t() {
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scn = 0;
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utc = 0;
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state = SCN_TRANSFORM_STATE::NOT_FOUND;
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err = DB_SUCCESS;
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}
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};
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namespace lizard {
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extern os_event_t scn_history_event;
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/** SCN rolling forward interval */
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extern ulint srv_scn_history_interval;
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/** SCN rolling forward task */
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extern bool srv_scn_history_task_enabled;
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/** The max time of scn history record keeped */
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extern ulint srv_scn_history_keep_days;
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/** Create INNODB_FLASHBACK_SNAPSHOT table */
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dd::Object_table *create_innodb_scn_hist_table();
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/** Start the background thread of scn rolling forward */
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extern void srv_scn_history_thread(void);
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/** Shutdown the background thread of scn rolling forward */
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extern void srv_scn_history_shutdown();
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/** Init the background thread attributes */
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extern void srv_scn_history_thread_init();
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/** Deinit the background thread attributes */
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extern void srv_scn_history_thread_deinit();
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/**
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Try the best to transform UTC to SCN,
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it will search the first record which is more than the utc.
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Pls confirm the result state to judge whether the tranformation is success,
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and also it can report the error to client user if required through
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result.err.
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@param[in] utc Measure by second.
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@retval result
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*/
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extern scn_transform_result_t try_scn_transform_by_utc(const ulint utc);
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} // namespace lizard
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#endif // lizard0scn0hist_h
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