myisam.h
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上传日期:2022-05-23
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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
- #ifndef _keycache_h
- #include "keycache.h"
- #endif
- #include "my_handler.h"
- /* defines used by myisam-funktions */
- /* The following defines can be increased if necessary */
- #define MI_MAX_KEY 64 /* Max allowed keys */
- #define MI_MAX_KEY_SEG 16 /* Max segments for key */
- #define MI_MAX_KEY_LENGTH 1000
- #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 2*1024L*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
- {
- const 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;
- ulonglong key_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, myisam_data_pointer_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,
- key_range *min_key, key_range *max_key);
- 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;
- /*
- MyISAM supports several statistics collection methods. Currently statistics
- collection method is not stored in MyISAM file and has to be specified for
- each table analyze/repair operation in MI_CHECK::stats_method.
- */
- typedef enum
- {
- /* Treat NULLs as inequal when collecting statistics (default for 4.1/5.0) */
- MI_STATS_METHOD_NULLS_NOT_EQUAL,
- /* Treat NULLs as equal when collecting statistics (like 4.0 did) */
- MI_STATS_METHOD_NULLS_EQUAL,
- /* Ignore NULLs - count only tuples without NULLs in the index components */
- MI_STATS_METHOD_IGNORE_NULLS
- } enum_mi_stats_method;
- typedef struct st_mi_check_param
- {
- ulonglong auto_increment_value;
- ulonglong max_data_file_length;
- ulonglong keys_in_use;
- ulonglong max_record_length;
- 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, key_cache_block_size;
- 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;
-
- /*
- The next two are used to collect statistics, see update_key_parts for
- description.
- */
- ulonglong unique_count[MI_MAX_KEY_SEG+1];
- ulonglong notnull_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;
- enum_mi_stats_method stats_method;
- } 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);
- 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 *notnull,
- 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_assign_to_key_cache(MI_INFO *info, ulonglong key_map,
- KEY_CACHE *key_cache);
- void mi_change_key_cache(KEY_CACHE *old_key_cache,
- KEY_CACHE *new_key_cache);
- int mi_preload(MI_INFO *info, ulonglong key_map, my_bool ignore_leaves);
- #ifdef __cplusplus
- }
- #endif
- #endif