1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/*****************************************************************************
Copyright (c) 2009, 2018, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2021, MariaDB Corporation.
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 Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/dict0stats.h
Code used for calculating and manipulating table statistics.
Created Jan 06, 2010 Vasil Dimov
*******************************************************/
#ifndef dict0stats_h
#define dict0stats_h
#include "dict0types.h"
#include "trx0types.h"
enum dict_stats_upd_option_t {
DICT_STATS_RECALC_PERSISTENT,/* (re) calculate the
statistics using a precise and slow
algo and save them to the persistent
storage, if the persistent storage is
not present then emit a warning and
fall back to transient stats */
DICT_STATS_RECALC_TRANSIENT,/* (re) calculate the statistics
using an imprecise quick algo
without saving the results
persistently */
DICT_STATS_EMPTY_TABLE, /* Write all zeros (or 1 where it makes sense)
into a table and its indexes' statistics
members. The resulting stats correspond to an
empty table. If the table is using persistent
statistics, then they are saved on disk. */
DICT_STATS_FETCH_ONLY_IF_NOT_IN_MEMORY /* fetch the stats
from the persistent storage if the in-memory
structures have not been initialized yet,
otherwise do nothing */
};
/*********************************************************************//**
Set the persistent statistics flag for a given table. This is set only
in the in-memory table object and is not saved on disk. It will be read
from the .frm file upon first open from MySQL after a server restart. */
UNIV_INLINE
void
dict_stats_set_persistent(
/*======================*/
dict_table_t* table, /*!< in/out: table */
ibool ps_on, /*!< in: persistent stats explicitly enabled */
ibool ps_off) /*!< in: persistent stats explicitly disabled */
MY_ATTRIBUTE((nonnull));
/** @return whether persistent statistics is enabled for a given table */
UNIV_INLINE
bool
dict_stats_is_persistent_enabled(const dict_table_t* table)
MY_ATTRIBUTE((nonnull, warn_unused_result));
/*********************************************************************//**
Set the auto recalc flag for a given table (only honored for a persistent
stats enabled table). The flag is set only in the in-memory table object
and is not saved in InnoDB files. It will be read from the .frm file upon
first open from MySQL after a server restart. */
UNIV_INLINE
void
dict_stats_auto_recalc_set(
/*=======================*/
dict_table_t* table, /*!< in/out: table */
ibool auto_recalc_on, /*!< in: explicitly enabled */
ibool auto_recalc_off); /*!< in: explicitly disabled */
/** @return whether auto recalc is enabled for a given table*/
UNIV_INLINE
bool
dict_stats_auto_recalc_is_enabled(const dict_table_t* table)
MY_ATTRIBUTE((nonnull, warn_unused_result));
/*********************************************************************//**
Initialize table's stats for the first time when opening a table. */
UNIV_INLINE
void
dict_stats_init(
/*============*/
dict_table_t* table); /*!< in/out: table */
/*********************************************************************//**
Deinitialize table's stats after the last close of the table. This is
used to detect "FLUSH TABLE" and refresh the stats upon next open. */
UNIV_INLINE
void
dict_stats_deinit(
/*==============*/
dict_table_t* table) /*!< in/out: table */
MY_ATTRIBUTE((nonnull));
#ifdef WITH_WSREP
/** Update the table modification counter and if necessary,
schedule new estimates for table and index statistics to be calculated.
@param[in,out] table persistent or temporary table
@param[in] trx transaction */
void dict_stats_update_if_needed(dict_table_t *table, const trx_t &trx)
MY_ATTRIBUTE((nonnull));
#else
/** Update the table modification counter and if necessary,
schedule new estimates for table and index statistics to be calculated.
@param[in,out] table persistent or temporary table */
void dict_stats_update_if_needed_func(dict_table_t *table)
MY_ATTRIBUTE((nonnull));
# define dict_stats_update_if_needed(t,trx) dict_stats_update_if_needed_func(t)
#endif
/*********************************************************************//**
Calculates new estimates for table and index statistics. The statistics
are used in query optimization.
@return DB_* error code or DB_SUCCESS */
dberr_t
dict_stats_update(
/*==============*/
dict_table_t* table, /*!< in/out: table */
dict_stats_upd_option_t stats_upd_option);
/*!< in: whether to (re) calc
the stats or to fetch them from
the persistent storage */
/** Execute DELETE FROM mysql.innodb_table_stats
@param database_name database name
@param table_name table name
@param trx transaction
@return DB_SUCCESS or error code */
dberr_t dict_stats_delete_from_table_stats(const char *database_name,
const char *table_name,
trx_t *trx)
MY_ATTRIBUTE((nonnull));
/** Execute DELETE FROM mysql.innodb_index_stats
@param database_name database name
@param table_name table name
@param trx transaction
@return DB_SUCCESS or error code */
dberr_t dict_stats_delete_from_index_stats(const char *database_name,
const char *table_name,
trx_t *trx)
MY_ATTRIBUTE((nonnull));
/** Execute DELETE FROM mysql.innodb_index_stats
@param database_name database name
@param table_name table name
@param index_name name of the index
@param trx transaction (nullptr=start and commit a new one)
@return DB_SUCCESS or error code */
dberr_t dict_stats_delete_from_index_stats(const char *database_name,
const char *table_name,
const char *index_name, trx_t *trx);
/*********************************************************************//**
Fetches or calculates new estimates for index statistics. */
void
dict_stats_update_for_index(
/*========================*/
dict_index_t* index) /*!< in/out: index */
MY_ATTRIBUTE((nonnull));
/** Rename a table in InnoDB persistent stats storage.
@param old_name old table name
@param new_name new table name
@param trx transaction
@return DB_SUCCESS or error code */
dberr_t dict_stats_rename_table(const char *old_name, const char *new_name,
trx_t *trx);
/** Rename an index in InnoDB persistent statistics.
@param db database name
@param table table name
@param old_name old table name
@param new_name new table name
@param trx transaction
@return DB_SUCCESS or error code */
dberr_t dict_stats_rename_index(const char *db, const char *table,
const char *old_name, const char *new_name,
trx_t *trx);
/** Delete all persistent statistics for a database.
@param db database name
@param trx transaction
@return DB_SUCCESS or error code */
dberr_t dict_stats_delete(const char *db, trx_t *trx);
/** Save an individual index's statistic into the persistent statistics
storage.
@param[in] index index to be updated
@param[in] last_update timestamp of the stat
@param[in] stat_name name of the stat
@param[in] stat_value value of the stat
@param[in] sample_size n pages sampled or NULL
@param[in] stat_description description of the stat
@param[in,out] trx transaction
@return DB_SUCCESS or error code */
dberr_t
dict_stats_save_index_stat(
dict_index_t* index,
time_t last_update,
const char* stat_name,
ib_uint64_t stat_value,
ib_uint64_t* sample_size,
const char* stat_description,
trx_t* trx)
MY_ATTRIBUTE((nonnull(1, 3, 6, 7)));
/** Report an error if updating table statistics failed because
.ibd file is missing, table decryption failed or table is corrupted.
@param[in,out] table Table
@param[in] defragment true if statistics is for defragment
@retval DB_DECRYPTION_FAILED if decryption of the table failed
@retval DB_TABLESPACE_DELETED if .ibd file is missing
@retval DB_CORRUPTION if table is marked as corrupted */
dberr_t
dict_stats_report_error(dict_table_t* table, bool defragment = false)
MY_ATTRIBUTE((nonnull, warn_unused_result));
#include "dict0stats.inl"
#ifdef UNIV_ENABLE_UNIT_TEST_DICT_STATS
void test_dict_stats_all();
#endif /* UNIV_ENABLE_UNIT_TEST_DICT_STATS */
/** Write all zeros (or 1 where it makes sense) into a table
and its indexes'statistics members. The resulting stats
correspond to an empty table.
@param table table stats to be emptied
@param empty_defrag_stats empty the defrag stats */
void
dict_stats_empty_table(
dict_table_t* table,
bool empty_defrag_stats);
#endif /* dict0stats_h */
|
