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b740b2356d
dict_stats_process_entry_from_defrag_pool(): Acquire MDL on the table for which we are invoking dict_stats_save_defrag_stats(), to avoid any race condition with DROP TABLE or similar operations.
101 lines
3.7 KiB
C++
101 lines
3.7 KiB
C++
/*****************************************************************************
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Copyright (c) 2016, 2021, MariaDB Corporation.
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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 as published by the Free Software
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Foundation; version 2 of the License.
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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 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 Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/dict0defrag_bg.h
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Code used for background table and index
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defragmentation
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Created 25/08/2016 Jan Lindström
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*******************************************************/
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#ifndef dict0defrag_bg_h
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#define dict0defrag_bg_h
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#include "dict0types.h"
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/** Indices whose defrag stats need to be saved to persistent storage.*/
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struct defrag_pool_item_t {
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table_id_t table_id;
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index_id_t index_id;
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};
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/** Allocator type, used by std::vector */
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typedef ut_allocator<defrag_pool_item_t>
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defrag_pool_allocator_t;
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/** The multitude of tables to be defragmented- an STL vector */
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typedef std::vector<defrag_pool_item_t, defrag_pool_allocator_t>
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defrag_pool_t;
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/** Pool where we store information on which tables are to be processed
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by background defragmentation. */
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extern defrag_pool_t defrag_pool;
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/*****************************************************************//**
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Initialize the defrag pool, called once during thread initialization. */
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void
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dict_defrag_pool_init(void);
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/*========================*/
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/*****************************************************************//**
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Free the resources occupied by the defrag pool, called once during
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thread de-initialization. */
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void
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dict_defrag_pool_deinit(void);
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/*==========================*/
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/*****************************************************************//**
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Add an index in a table to the defrag pool, which is processed by the
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background stats gathering thread. Only the table id and index id are
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added to the list, so the table can be closed after being enqueued and
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it will be opened when needed. If the table or index does not exist later
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(has been DROPped), then it will be removed from the pool and skipped. */
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void
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dict_stats_defrag_pool_add(
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/*=======================*/
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const dict_index_t* index); /*!< in: table to add */
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/*****************************************************************//**
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Delete a given index from the auto defrag pool. */
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void
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dict_stats_defrag_pool_del(
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/*=======================*/
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const dict_table_t* table, /*!<in: if given, remove
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all entries for the table */
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const dict_index_t* index); /*!< in: index to remove */
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/**
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Get the first index that has been added for updating persistent defrag
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stats and eventually save its stats. */
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void dict_defrag_process_entries_from_defrag_pool(THD *thd);
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/*********************************************************************//**
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Save defragmentation result.
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@return DB_SUCCESS or error code */
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dberr_t dict_stats_save_defrag_summary(dict_index_t *index, THD *thd)
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MY_ATTRIBUTE((nonnull, warn_unused_result));
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/*********************************************************************//**
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Save defragmentation stats for a given index.
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@return DB_SUCCESS or error code */
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dberr_t
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dict_stats_save_defrag_stats(
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/*============================*/
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dict_index_t* index); /*!< in: index */
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#endif /* dict0defrag_bg_h */
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