myisam.h
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上传日期:2007-04-14
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文件大小:14k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; 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
- /* 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
- #define mi_portable_sizeof_char_ptr 8
- typedef uint32 ha_checksum;
- /* 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 */
- uint keys; /* Number of keys in use */
- uint options; /* HA_OPTIONS_... 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
- {
- 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;
- } MI_CREATE_INFO;
- struct st_myisam_info; /* For referense */
- typedef struct st_myisam_info MI_INFO;
- typedef struct st_mi_keyseg /* Key-portion */
- {
- uint8 type; /* Type of key (for sort) */
- uint8 language;
- uint8 null_bit; /* bitmask to test for NULL */
- uint8 bit_start,bit_end; /* if bit field */
- uint16 flag;
- uint16 length; /* Keylength */
- uint32 start; /* Start of key in record */
- uint32 null_pos; /* position to NULL indicator */
- CHARSET_INFO *charset;
- } MI_KEYSEG;
- 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 */
- 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 */
- MI_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);
- } 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;
- MI_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;
- extern my_string myisam_log_filename; /* Name of logfile */
- extern uint myisam_block_size;
- extern my_bool myisam_flush,myisam_delay_key_write;
- extern my_bool myisam_concurrent_insert;
- extern my_off_t myisam_max_temp_length,myisam_max_extra_temp_length;
- /* 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);
- 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 /* run equivalent of myisamchk -c,
- * if corruption is detected, do myisamchk -r*/
- /* definitions needed for myisamchk.c -- by Sasha Pachev */
- #define T_VERBOSE 1
- #define T_SILENT 2
- #define T_DESCRIPT 4
- #define T_EXTEND 8
- #define T_INFO 16
- #define T_REP 32
- #define T_OPT 64 /* Not currently used */
- #define T_FORCE_CREATE 128
- #define T_WRITE_LOOP 256
- #define T_UNPACK 512
- #define T_STATISTICS 1024
- #define T_VERY_SILENT 2048
- #define T_SORT_RECORDS 4096
- #define T_SORT_INDEX 8192
- #define T_WAIT_FOREVER 16384
- #define T_REP_BY_SORT 32768L
- #define T_FAST 65536L
- #define T_READONLY 131072L
- #define T_MEDIUM T_READONLY*2
- #define T_AUTO_INC T_MEDIUM*2
- #define T_CHECK T_AUTO_INC*2
- #define T_UPDATE_STATE T_CHECK*2
- #define T_CHECK_ONLY_CHANGED T_UPDATE_STATE*2
- #define T_DONT_CHECK_CHECKSUM T_CHECK_ONLY_CHANGED*2
- #define T_TRUST_HEADER T_DONT_CHECK_CHECKSUM*2
- #define T_CREATE_MISSING_KEYS T_TRUST_HEADER*2
- #define T_SAFE_REPAIR T_CREATE_MISSING_KEYS*2
- #define T_AUTO_REPAIR T_SAFE_REPAIR*2
- #define T_BACKUP_DATA T_AUTO_REPAIR*2
- #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;
- struct st_mi_check_param;
- typedef struct st_sort_info {
- MI_INFO *info;
- struct st_mi_check_param *param;
- enum data_file_type new_data_file_type;
- SORT_KEY_BLOCKS *key_block,*key_block_end;
- uint key,find_length;
- my_off_t pos,max_pos,filepos,start_recpos,filelength,dupp,buff_length;
- ha_rows max_records;
- ulonglong unique[MI_MAX_KEY_SEG+1];
- my_bool fix_datafile;
- char *record,*buff;
- MI_KEYDEF *keyinfo;
- MI_KEYSEG *keyseg;
- } SORT_INFO;
- 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,
- opt_rep_quick,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,retry_without_quick, force_sort;
- char temp_filename[FN_REFLEN],*isam_file_name,*tmpdir;
- int tmpfile_createflag;
- myf myf_rw;
- IO_CACHE read_cache;
- SORT_INFO sort_info;
- 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* table_name;
- char* op_name;
- } MI_CHECK;
- typedef struct st_mi_sortinfo {
- ha_rows max_records;
- SORT_INFO *sort_info;
- char *tmpdir;
- int (*key_cmp)(SORT_INFO *info, const void *, const void *);
- int (*key_read)(SORT_INFO *info,void *buff);
- int (*key_write)(SORT_INFO *info, const void *buff);
- void (*lock_in_memory)(MI_CHECK *info);
- uint key_length;
- myf myf_rw;
- } MI_SORT_PARAM;
- /* 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 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);
- 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 sort_write_record(SORT_INFO *sort_info);
- int write_data_suffix(MI_CHECK *param, MI_INFO *info);
- int _create_index_by_sort(MI_SORT_PARAM *info,my_bool no_messages,
- ulong);
- 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, my_bool force);
- #ifdef __cplusplus
- }
- #endif
- #endif