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ec8257216e
SYNTAX: ATOMIC_WRITES=['DEFAULT','ON','OFF']
Idea here is to be able to define innodb_doublewrite = 1 but with following rules:
ATOMIC_WRITES='DEFAULT' - if innodb_use_atomic_writes = 1, we do not write to doublewrite buffer the changes
if innodb_use_atomic_writes = 0, we write to doublewrite buffer
ATOMIC_WRITES='ON' - do not write to doublewrite buffer
ATOMIC_WRITES='OFF' - write to doublewrite buffer
Note that doublewrite buffer can't be used if innodb_doublewrite = 0.
73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/*****************************************************************************
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Copyright (C) 2013 SkySQL Ab. 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
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*****************************************************************************/
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/******************************************************************//**
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@file include/fsp0pagecompress.h
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Helper functions for extracting/storing page compression and
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atomic writes information to file space.
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Created 11/12/2013 Jan Lindström jan.lindstrom@skysql.com
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***********************************************************************/
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#ifndef fsp0pagecompress_h
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#define fsp0pagecompress_h
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/**********************************************************************//**
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Reads the page compression level from the first page of a tablespace.
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@return page compression level, or 0 if uncompressed */
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UNIV_INTERN
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ulint
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fsp_header_get_compression_level(
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/*=============================*/
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const page_t* page); /*!< in: first page of a tablespace */
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/********************************************************************//**
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Determine if the tablespace is page compressed from dict_table_t::flags.
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@return TRUE if page compressed, FALSE if not compressed */
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UNIV_INLINE
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ibool
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fsp_flags_is_page_compressed(
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/*=========================*/
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ulint flags); /*!< in: tablespace flags */
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/********************************************************************//**
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Extract the page compression level from tablespace flags.
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A tablespace has only one physical page compression level
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whether that page is compressed or not.
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@return page compression level of the file-per-table tablespace,
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or zero if the table is not compressed. */
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UNIV_INLINE
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ulint
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fsp_flags_get_page_compression_level(
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/*=================================*/
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ulint flags); /*!< in: tablespace flags */
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/********************************************************************//**
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Determine the tablespace is using atomic writes from dict_table_t::flags.
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@return true if atomic writes is used, false if not */
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UNIV_INLINE
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atomic_writes_t
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fsp_flags_get_atomic_writes(
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/*========================*/
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ulint flags); /*!< in: tablespace flags */
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#ifndef UNIV_NONINL
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#include "fsp0pagecompress.ic"
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#endif
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#endif
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