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104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
/*****************************************************************************
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Copyright (C) 2013, 2014 Facebook, Inc. All Rights Reserved.
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Copyright (C) 2014, 2015, 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, Suite 500, Boston, MA 02110-1335 USA
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*****************************************************************************/
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#ifndef btr0defragment_h
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#define btr0defragment_h
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#include "univ.i"
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#ifndef UNIV_HOTBACKUP
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#include "btr0pcur.h"
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/* Max number of pages to consider at once during defragmentation. */
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#define BTR_DEFRAGMENT_MAX_N_PAGES 32
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/** stats in btr_defragment */
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extern ulint btr_defragment_compression_failures;
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extern ulint btr_defragment_failures;
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extern ulint btr_defragment_count;
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/** Item in the work queue for btr_degrament_thread. */
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struct btr_defragment_item_t
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{
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btr_pcur_t* pcur; /* persistent cursor where
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btr_defragment_n_pages should start */
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os_event_t event; /* if not null, signal after work
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is done */
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bool removed; /* Mark an item as removed */
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ulonglong last_processed; /* timestamp of last time this index
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is processed by defragment thread */
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btr_defragment_item_t(btr_pcur_t* pcur, os_event_t event);
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~btr_defragment_item_t();
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};
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/******************************************************************//**
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Initialize defragmentation. */
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void
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btr_defragment_init(void);
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/******************************************************************//**
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Shutdown defragmentation. */
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void
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btr_defragment_shutdown();
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/******************************************************************//**
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Check whether the given index is in btr_defragment_wq. */
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bool
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btr_defragment_find_index(
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dict_index_t* index); /*!< Index to find. */
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/******************************************************************//**
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Add an index to btr_defragment_wq. Return a pointer to os_event if this
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is a synchronized defragmentation. */
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os_event_t
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btr_defragment_add_index(
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dict_index_t* index, /*!< index to be added */
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bool async, /*!< whether this is an async
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defragmentation */
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dberr_t* err); /*!< out: error code */
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/******************************************************************//**
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When table is dropped, this function is called to mark a table as removed in
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btr_efragment_wq. The difference between this function and the remove_index
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function is this will not NULL the event. */
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void
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btr_defragment_remove_table(
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dict_table_t* table); /*!< Index to be removed. */
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/******************************************************************//**
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Mark an index as removed from btr_defragment_wq. */
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void
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btr_defragment_remove_index(
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dict_index_t* index); /*!< Index to be removed. */
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/*********************************************************************//**
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Check whether we should save defragmentation statistics to persistent storage.*/
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UNIV_INTERN
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void
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btr_defragment_save_defrag_stats_if_needed(
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dict_index_t* index); /*!< in: index */
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/******************************************************************//**
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Thread that merges consecutive b-tree pages into fewer pages to defragment
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the index. */
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extern "C" UNIV_INTERN
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os_thread_ret_t
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DECLARE_THREAD(btr_defragment_thread)(
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/*==========================================*/
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void* arg); /*!< in: a dummy parameter required by
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os_thread_create */
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#endif /* !UNIV_HOTBACKUP */
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#endif
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