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1d20c09ce94e8897079278aee293c151a6aa5513
mariadb/include/myisam.h
serg@serg.mylan 79922d946a table checksum background: 
my_checksum() mysys function
   NISAM checksum code moved from mysys to isam/ - it's obsolete
   MyISAM checksum code moved to mysys
   table's checksum accessible from sql layer
   SHOW TABLE STATUS shows checksum (WL#646)
code cleanup
2003-08-05 21:14:15 +02:00

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/* Copyright (C) 2000 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* This file should be included when using myisam_funktions */
#ifndef _myisam_h
#define _myisam_h
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _my_base_h
#include <my_base.h>
#endif
#ifndef _m_ctype_h
#include <m_ctype.h>
#endif
#include "my_handler.h"
/* defines used by myisam-funktions */
/* The following defines can be increased if necessary */
#define MI_MAX_KEY 32 /* Max allowed keys */
#define MI_MAX_KEY_SEG 16 /* Max segments for key */
#define MI_MAX_KEY_LENGTH 500
#define MI_MAX_KEY_BUFF (MI_MAX_KEY_LENGTH+MI_MAX_KEY_SEG*6+8+8)
#define MI_MAX_POSSIBLE_KEY_BUFF (1024+6+6) /* For myisam_chk */
#define MI_MAX_POSSIBLE_KEY 64 /* For myisam_chk */
#define MI_MAX_MSG_BUF 1024 /* used in CHECK TABLE, REPAIR TABLE */
#define MI_NAME_IEXT ".MYI"
#define MI_NAME_DEXT ".MYD"
/* Max extra space to use when sorting keys */
#define MI_MAX_TEMP_LENGTH 256*1024L*1024L
/* Possible values for myisam_block_size (must be power of 2) */
#define MI_KEY_BLOCK_LENGTH 1024 /* default key block length */
#define MI_MIN_KEY_BLOCK_LENGTH 1024 /* Min key block length */
#define MI_MAX_KEY_BLOCK_LENGTH 16384
#define mi_portable_sizeof_char_ptr 8
/* Param to/from mi_info */
typedef struct st_mi_isaminfo /* Struct from h_info */
{
ha_rows records; /* Records in database */
ha_rows deleted; /* Deleted records in database */
my_off_t recpos; /* Pos for last used record */
my_off_t newrecpos; /* Pos if we write new record */
my_off_t dupp_key_pos; /* Position to record with dupp key */
my_off_t data_file_length, /* Length of data file */
max_data_file_length,
index_file_length,
max_index_file_length,
delete_length;
ulong reclength; /* Recordlength */
ulong mean_reclength; /* Mean recordlength (if packed) */
ulonglong auto_increment;
ulonglong key_map; /* Which keys are used */
char *data_file_name, *index_file_name;
uint keys; /* Number of keys in use */
uint options; /* HA_OPTION_... used */
int errkey, /* With key was dupplicated on err */
sortkey; /* clustered by this key */
File filenr; /* (uniq) filenr for datafile */
time_t create_time; /* When table was created */
time_t check_time;
time_t update_time;
uint reflength;
ulong record_offset;
ulong *rec_per_key; /* for sql optimizing */
uint raid_type,raid_chunks;
ulong raid_chunksize;
} MI_ISAMINFO;
typedef struct st_mi_create_info
{
char *index_file_name, *data_file_name; /* If using symlinks */
ha_rows max_rows;
ha_rows reloc_rows;
ulonglong auto_increment;
ulonglong data_file_length;
uint raid_type,raid_chunks;
ulong raid_chunksize;
uint old_options;
uint8 language;
my_bool with_auto_increment;
} MI_CREATE_INFO;
struct st_myisam_info; /* For referense */
typedef struct st_myisam_info MI_INFO;
struct st_mi_s_param;
typedef struct st_mi_keydef /* Key definition with open & info */
{
uint16 keysegs; /* Number of key-segment */
uint16 flag; /* NOSAME, PACK_USED */
uint8 key_alg; /* BTREE, RTREE */
uint16 block_length; /* Length of keyblock (auto) */
uint16 underflow_block_length; /* When to execute underflow */
uint16 keylength; /* Tot length of keyparts (auto) */
uint16 minlength; /* min length of (packed) key (auto) */
uint16 maxlength; /* max length of (packed) key (auto) */
uint16 block_size; /* block_size (auto) */
uint32 version; /* For concurrent read/write */
HA_KEYSEG *seg,*end;
int (*bin_search)(struct st_myisam_info *info,struct st_mi_keydef *keyinfo,
uchar *page,uchar *key,
uint key_len,uint comp_flag,uchar * *ret_pos,
uchar *buff, my_bool *was_last_key);
uint (*get_key)(struct st_mi_keydef *keyinfo,uint nod_flag,uchar * *page,
uchar *key);
int (*pack_key)(struct st_mi_keydef *keyinfo,uint nod_flag,uchar *next_key,
uchar *org_key, uchar *prev_key, uchar *key,
struct st_mi_s_param *s_temp);
void (*store_key)(struct st_mi_keydef *keyinfo, uchar *key_pos,
struct st_mi_s_param *s_temp);
int (*ck_insert)(struct st_myisam_info *inf, uint k_nr, uchar *k, uint klen);
int (*ck_delete)(struct st_myisam_info *inf, uint k_nr, uchar *k, uint klen);
} MI_KEYDEF;
#define MI_UNIQUE_HASH_LENGTH 4
typedef struct st_unique_def /* Segment definition of unique */
{
uint16 keysegs; /* Number of key-segment */
uchar key; /* Mapped to which key */
uint8 null_are_equal;
HA_KEYSEG *seg,*end;
} MI_UNIQUEDEF;
typedef struct st_mi_decode_tree /* Decode huff-table */
{
uint16 *table;
uint quick_table_bits;
byte *intervalls;
} MI_DECODE_TREE;
struct st_mi_bit_buff;
/*
Note that null markers should always be first in a row !
When creating a column, one should only specify:
type, length, null_bit and null_pos
*/
typedef struct st_columndef /* column information */
{
int16 type; /* en_fieldtype */
uint16 length; /* length of field */
uint32 offset; /* Offset to position in row */
uint8 null_bit; /* If column may be 0 */
uint16 null_pos; /* position for null marker */
#ifndef NOT_PACKED_DATABASES
void (*unpack)(struct st_columndef *rec,struct st_mi_bit_buff *buff,
uchar *start,uchar *end);
enum en_fieldtype base_type;
uint space_length_bits,pack_type;
MI_DECODE_TREE *huff_tree;
#endif
} MI_COLUMNDEF;
/* invalidator function reference for Query Cache */
typedef void (* invalidator_by_filename)(const char * filename);
extern my_string myisam_log_filename; /* Name of logfile */
extern uint myisam_block_size;
extern my_bool myisam_flush,myisam_delay_key_write,myisam_single_user;
extern my_bool myisam_concurrent_insert;
extern my_off_t myisam_max_temp_length,myisam_max_extra_temp_length;
extern ulong myisam_bulk_insert_tree_size;
/* Prototypes for myisam-functions */
extern int mi_close(struct st_myisam_info *file);
extern int mi_delete(struct st_myisam_info *file,const byte *buff);
extern struct st_myisam_info *mi_open(const char *name,int mode,
uint wait_if_locked);
extern int mi_panic(enum ha_panic_function function);
extern int mi_rfirst(struct st_myisam_info *file,byte *buf,int inx);
extern int mi_rkey(struct st_myisam_info *file,byte *buf,int inx,
const byte *key,
uint key_len, enum ha_rkey_function search_flag);
extern int mi_rlast(struct st_myisam_info *file,byte *buf,int inx);
extern int mi_rnext(struct st_myisam_info *file,byte *buf,int inx);
extern int mi_rnext_same(struct st_myisam_info *info, byte *buf);
extern int mi_rprev(struct st_myisam_info *file,byte *buf,int inx);
extern int mi_rrnd(struct st_myisam_info *file,byte *buf, my_off_t pos);
extern int mi_scan_init(struct st_myisam_info *file);
extern int mi_scan(struct st_myisam_info *file,byte *buf);
extern int mi_rsame(struct st_myisam_info *file,byte *record,int inx);
extern int mi_rsame_with_pos(struct st_myisam_info *file,byte *record,
int inx, my_off_t pos);
extern int mi_update(struct st_myisam_info *file,const byte *old,
byte *new_record);
extern int mi_write(struct st_myisam_info *file,byte *buff);
extern my_off_t mi_position(struct st_myisam_info *file);
extern int mi_status(struct st_myisam_info *info, MI_ISAMINFO *x, uint flag);
extern int mi_lock_database(struct st_myisam_info *file,int lock_type);
extern int mi_create(const char *name,uint keys,MI_KEYDEF *keydef,
uint columns, MI_COLUMNDEF *columndef,
uint uniques, MI_UNIQUEDEF *uniquedef,
MI_CREATE_INFO *create_info, uint flags);
extern int mi_delete_table(const char *name);
extern int mi_rename(const char *from, const char *to);
extern int mi_extra(struct st_myisam_info *file,
enum ha_extra_function function,
void *extra_arg);
extern ha_rows mi_records_in_range(struct st_myisam_info *info,int inx,
const byte *start_key,uint start_key_len,
enum ha_rkey_function start_search_flag,
const byte *end_key,uint end_key_len,
enum ha_rkey_function end_search_flag);
extern int mi_log(int activate_log);
extern int mi_is_changed(struct st_myisam_info *info);
extern int mi_delete_all_rows(struct st_myisam_info *info);
extern ulong _mi_calc_blob_length(uint length , const byte *pos);
extern uint mi_get_pointer_length(ulonglong file_length, uint def);
/* this is used to pass to mysql_myisamchk_table -- by Sasha Pachev */
#define MYISAMCHK_REPAIR 1 /* equivalent to myisamchk -r */
#define MYISAMCHK_VERIFY 2 /* Verify, run repair if failure */
/*
Definitions needed for myisamchk.c
Entries marked as "QQ to be removed" are NOT used to
pass check/repair options to mi_check.c. They are used
internally by myisamchk.c or/and ha_myisam.cc and should NOT
be stored together with other flags. They should be removed
from the following list to make addition of new flags possible.
*/
#define T_AUTO_INC 1
#define T_AUTO_REPAIR 2 /* QQ to be removed */
#define T_BACKUP_DATA 4
#define T_CALC_CHECKSUM 8
#define T_CHECK 16 /* QQ to be removed */
#define T_CHECK_ONLY_CHANGED 32 /* QQ to be removed */
#define T_CREATE_MISSING_KEYS 64
#define T_DESCRIPT 128
#define T_DONT_CHECK_CHECKSUM 256
#define T_EXTEND 512
#define T_FAST (1L << 10) /* QQ to be removed */
#define T_FORCE_CREATE (1L << 11) /* QQ to be removed */
#define T_FORCE_UNIQUENESS (1L << 12)
#define T_INFO (1L << 13)
#define T_MEDIUM (1L << 14)
#define T_QUICK (1L << 15) /* QQ to be removed */
#define T_READONLY (1L << 16) /* QQ to be removed */
#define T_REP (1L << 17)
#define T_REP_BY_SORT (1L << 18) /* QQ to be removed */
#define T_REP_PARALLEL (1L << 19) /* QQ to be removed */
#define T_RETRY_WITHOUT_QUICK (1L << 20)
#define T_SAFE_REPAIR (1L << 21)
#define T_SILENT (1L << 22)
#define T_SORT_INDEX (1L << 23) /* QQ to be removed */
#define T_SORT_RECORDS (1L << 24) /* QQ to be removed */
#define T_STATISTICS (1L << 25)
#define T_UNPACK (1L << 26)
#define T_UPDATE_STATE (1L << 27)
#define T_VERBOSE (1L << 28)
#define T_VERY_SILENT (1L << 29)
#define T_WAIT_FOREVER (1L << 30)
#define T_WRITE_LOOP ((ulong) 1L << 31)
#define T_REP_ANY (T_REP | T_REP_BY_SORT | T_REP_PARALLEL)
/*
Flags used by myisamchk.c or/and ha_myisam.cc that are NOT passed
to mi_check.c follows:
*/
#define TT_USEFRM 1
#define O_NEW_INDEX 1 /* Bits set in out_flag */
#define O_NEW_DATA 2
#define O_DATA_LOST 4
/* these struct is used by my_check to tell it what to do */
typedef struct st_sort_key_blocks /* Used when sorting */
{
uchar *buff,*end_pos;
uchar lastkey[MI_MAX_POSSIBLE_KEY_BUFF];
uint last_length;
int inited;
} SORT_KEY_BLOCKS;
typedef struct st_mi_check_param
{
ulonglong auto_increment_value;
ulonglong max_data_file_length;
ulonglong keys_in_use;
my_off_t search_after_block;
my_off_t new_file_pos,key_file_blocks;
my_off_t keydata,totaldata,key_blocks,start_check_pos;
ha_rows total_records,total_deleted;
ha_checksum record_checksum,glob_crc;
ulong use_buffers,read_buffer_length,write_buffer_length,
sort_buffer_length,sort_key_blocks;
uint out_flag,warning_printed,error_printed,verbose;
uint opt_sort_key,total_files,max_level;
uint testflag;
uint8 language;
my_bool using_global_keycache, opt_lock_memory, opt_follow_links;
my_bool retry_repair, force_sort, calc_checksum;
char temp_filename[FN_REFLEN],*isam_file_name;
MY_TMPDIR *tmpdir;
int tmpfile_createflag;
myf myf_rw;
IO_CACHE read_cache;
ulonglong unique_count[MI_MAX_KEY_SEG+1];
ha_checksum key_crc[MI_MAX_POSSIBLE_KEY];
ulong rec_per_key_part[MI_MAX_KEY_SEG*MI_MAX_POSSIBLE_KEY];
void *thd;
char *db_name,*table_name;
char *op_name;
} MI_CHECK;
typedef struct st_sort_ft_buf
{
uchar *buf, *end;
int count;
uchar lastkey[MI_MAX_KEY_BUFF];
} SORT_FT_BUF;
typedef struct st_sort_info
{
my_off_t filelength,dupp,buff_length;
ha_rows max_records;
uint current_key, total_keys;
myf myf_rw;
enum data_file_type new_data_file_type;
MI_INFO *info;
MI_CHECK *param;
char *buff;
SORT_KEY_BLOCKS *key_block,*key_block_end;
SORT_FT_BUF *ft_buf;
/* sync things */
uint got_error, threads_running;
#ifdef THREAD
pthread_mutex_t mutex;
pthread_cond_t cond;
#endif
} SORT_INFO;
/* functions in mi_check */
void myisamchk_init(MI_CHECK *param);
int chk_status(MI_CHECK *param, MI_INFO *info);
int chk_del(MI_CHECK *param, register MI_INFO *info, uint test_flag);
int chk_size(MI_CHECK *param, MI_INFO *info);
int chk_key(MI_CHECK *param, MI_INFO *info);
int chk_data_link(MI_CHECK *param, MI_INFO *info,int extend);
int mi_repair(MI_CHECK *param, register MI_INFO *info,
my_string name, int rep_quick);
int mi_sort_index(MI_CHECK *param, register MI_INFO *info, my_string name);
int mi_repair_by_sort(MI_CHECK *param, register MI_INFO *info,
const char * name, int rep_quick);
int mi_repair_parallel(MI_CHECK *param, register MI_INFO *info,
const char * name, int rep_quick);
int change_to_newfile(const char * filename, const char * old_ext,
const char * new_ext, uint raid_chunks,
myf myflags);
int lock_file(MI_CHECK *param, File file, my_off_t start, int lock_type,
const char *filetype, const char *filename);
void lock_memory(MI_CHECK *param);
int flush_blocks(MI_CHECK *param, File file);
void update_auto_increment_key(MI_CHECK *param, MI_INFO *info,
my_bool repair);
int update_state_info(MI_CHECK *param, MI_INFO *info,uint update);
void update_key_parts(MI_KEYDEF *keyinfo, ulong *rec_per_key_part,
ulonglong *unique, ulonglong records);
int filecopy(MI_CHECK *param, File to,File from,my_off_t start,
my_off_t length, const char *type);
int movepoint(MI_INFO *info,byte *record,my_off_t oldpos,
my_off_t newpos, uint prot_key);
int write_data_suffix(SORT_INFO *sort_info, my_bool fix_datafile);
int test_if_almost_full(MI_INFO *info);
int recreate_table(MI_CHECK *param, MI_INFO **org_info, char *filename);
void mi_disable_non_unique_index(MI_INFO *info, ha_rows rows);
my_bool mi_test_if_sort_rep(MI_INFO *info, ha_rows rows, ulonglong key_map,
my_bool force);
int mi_init_bulk_insert(MI_INFO *info, ulong cache_size, ha_rows rows);
void mi_flush_bulk_insert(MI_INFO *info, uint inx);
void mi_end_bulk_insert(MI_INFO *info);
int mi_preload(MI_INFO *info, ulonglong key_map, my_bool ignore_leaves);
#ifdef __cplusplus
}
#endif
#endif
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