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dict0boot.h
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dict0boot.h
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/*****************************************************************************
Copyright (c) 1996, 2010, Innobase Oy. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/**************************************************//**
@file include/dict0boot.h
Data dictionary creation and booting
Created 4/18/1996 Heikki Tuuri
*******************************************************/
#ifndef dict0boot_h
#define dict0boot_h
#include "univ.i"
#include "mtr0mtr.h"
#include "mtr0log.h"
#include "ut0byte.h"
#include "buf0buf.h"
#include "fsp0fsp.h"
#include "dict0dict.h"
typedef byte dict_hdr_t;
/**********************************************************************//**
Gets a pointer to the dictionary header and x-latches its page.
@return pointer to the dictionary header, page x-latched */
UNIV_INTERN
dict_hdr_t*
dict_hdr_get(
/*=========*/
mtr_t* mtr); /*!< in: mtr */
/**********************************************************************//**
Returns a new table, index, or space id. */
UNIV_INTERN
void
dict_hdr_get_new_id(
/*================*/
table_id_t* table_id, /*!< out: table id
(not assigned if NULL) */
index_id_t* index_id, /*!< out: index id
(not assigned if NULL) */
ulint* space_id); /*!< out: space id
(not assigned if NULL) */
/**********************************************************************//**
Returns a new row id.
@return the new id */
UNIV_INLINE
row_id_t
dict_sys_get_new_row_id(void);
/*=========================*/
/**********************************************************************//**
Reads a row id from a record or other 6-byte stored form.
@return row id */
UNIV_INLINE
row_id_t
dict_sys_read_row_id(
/*=================*/
const byte* field); /*!< in: record field */
/**********************************************************************//**
Writes a row id to a record or other 6-byte stored form. */
UNIV_INLINE
void
dict_sys_write_row_id(
/*==================*/
byte* field, /*!< in: record field */
row_id_t row_id);/*!< in: row id */
/*****************************************************************//**
Initializes the data dictionary memory structures when the database is
started. This function is also called when the data dictionary is created. */
UNIV_INTERN
void
dict_boot(void);
/*===========*/
/*****************************************************************//**
Creates and initializes the data dictionary at the database creation. */
UNIV_INTERN
void
dict_create(void);
/*=============*/
/*****************************************************************//**
Verifies the SYS_STATS table by scanning its clustered index. This
function may only be called at InnoDB startup time.
@return TRUE if SYS_STATS was verified successfully */
UNIV_INTERN
ibool
dict_verify_xtradb_sys_stats(void);
/*==============================*/
/*****************************************************************//**
Discard the existing dictionary cache SYS_STATS information, create and
add it there anew. Does not touch the old SYS_STATS tablespace page
under the assumption that they are corrupted or overwritten for other
purposes. */
UNIV_INTERN
void
dict_recreate_xtradb_sys_stats(void);
/*================================*/
/* Space id and page no where the dictionary header resides */
#define DICT_HDR_SPACE 0 /* the SYSTEM tablespace */
#define DICT_HDR_PAGE_NO FSP_DICT_HDR_PAGE_NO
/* The ids for the basic system tables and their indexes */
#define DICT_TABLES_ID 1
#define DICT_COLUMNS_ID 2
#define DICT_INDEXES_ID 3
#define DICT_FIELDS_ID 4
#define DICT_STATS_ID 6
/* The following is a secondary index on SYS_TABLES */
#define DICT_TABLE_IDS_ID 5
#define DICT_HDR_FIRST_ID 10 /* the ids for tables etc. start
from this number, except for basic
system tables and their above defined
indexes; ibuf tables and indexes are
assigned as the id the number
DICT_IBUF_ID_MIN plus the space id */
#define DICT_IBUF_ID_MIN 0xFFFFFFFF00000000ULL
/* The offset of the dictionary header on the page */
#define DICT_HDR FSEG_PAGE_DATA
/*-------------------------------------------------------------*/
/* Dictionary header offsets */
#define DICT_HDR_ROW_ID 0 /* The latest assigned row id */
#define DICT_HDR_TABLE_ID 8 /* The latest assigned table id */
#define DICT_HDR_INDEX_ID 16 /* The latest assigned index id */
#define DICT_HDR_MAX_SPACE_ID 24 /* The latest assigned space id, or 0*/
#define DICT_HDR_MIX_ID_LOW 28 /* Obsolete,always DICT_HDR_FIRST_ID */
#define DICT_HDR_TABLES 32 /* Root of the table index tree */
#define DICT_HDR_TABLE_IDS 36 /* Root of the table index tree */
#define DICT_HDR_COLUMNS 40 /* Root of the column index tree */
#define DICT_HDR_INDEXES 44 /* Root of the index index tree */
#define DICT_HDR_FIELDS 48 /* Root of the index field
index tree */
#define DICT_HDR_STATS 52 /* Root of the stats tree */
#define DICT_HDR_FSEG_HEADER 56 /* Segment header for the tablespace
segment into which the dictionary
header is created */
#define DICT_HDR_XTRADB_MARK 256 /* Flag to distinguish expansion of XtraDB */
/*-------------------------------------------------------------*/
/* The field numbers in the SYS_TABLES clustered index */
#define DICT_SYS_TABLES_TYPE_FIELD 5
/* The field numbers in the SYS_INDEXES clustered index */
#define DICT_SYS_INDEXES_PAGE_NO_FIELD 8
#define DICT_SYS_INDEXES_SPACE_NO_FIELD 7
#define DICT_SYS_INDEXES_TYPE_FIELD 6
#define DICT_SYS_INDEXES_NAME_FIELD 4
#define DICT_SYS_STATS_DIFF_VALS_FIELD 4
#define DICT_SYS_STATS_NON_NULL_VALS_FIELD 5
/* When a row id which is zero modulo this number (which must be a power of
two) is assigned, the field DICT_HDR_ROW_ID on the dictionary header page is
updated */
#define DICT_HDR_ROW_ID_WRITE_MARGIN 256
#define DICT_HDR_XTRADB_FLAG 0x5854524144425F31ULL /* "XTRADB_1" */
#ifndef UNIV_NONINL
#include "dict0boot.ic"
#endif
#endif