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
|
/*****************************************************************************
Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2017, 2020, 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.ic
Code used for calculating and manipulating table statistics.
Created Jan 23, 2012 Vasil Dimov
*******************************************************/
#include "dict0dict.h"
#include "srv0srv.h"
/*********************************************************************//**
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 */
{
/* Not allowed to have both flags set, but a CREATE or ALTER
statement that contains "STATS_PERSISTENT=0 STATS_PERSISTENT=1" would
end up having both set. In this case we clear the OFF flag. */
if (ps_on && ps_off) {
ps_off = FALSE;
}
ib_uint32_t stat_persistent = 0;
if (ps_on) {
stat_persistent |= DICT_STATS_PERSISTENT_ON;
}
if (ps_off) {
stat_persistent |= DICT_STATS_PERSISTENT_OFF;
}
/* we rely on this assignment to be atomic */
table->stat_persistent = stat_persistent;
}
/** @return whether persistent statistics is enabled for a given table */
UNIV_INLINE
bool
dict_stats_is_persistent_enabled(const dict_table_t* table)
{
/* Because of the nature of this check (non-locking) it is possible
that a table becomes:
* PS-disabled immediately after this function has returned TRUE or
* PS-enabled immediately after this function has returned FALSE.
This means that it is possible that we do:
+ dict_stats_update(DICT_STATS_RECALC_PERSISTENT) on a table that has
just been PS-disabled or
+ dict_stats_update(DICT_STATS_RECALC_TRANSIENT) on a table that has
just been PS-enabled.
This is acceptable. Avoiding this would mean that we would have to
protect the ::stat_persistent with dict_table_t::stats_latch like the
other ::stat_ members which would be too big performance penalty,
especially when this function is called from
dict_stats_update_if_needed(). */
/* we rely on this read to be atomic */
ib_uint32_t stat_persistent = table->stat_persistent;
if (stat_persistent & DICT_STATS_PERSISTENT_ON) {
ut_ad(!(stat_persistent & DICT_STATS_PERSISTENT_OFF));
return(true);
} else if (stat_persistent & DICT_STATS_PERSISTENT_OFF) {
return(false);
} else {
return(srv_stats_persistent);
}
}
/*********************************************************************//**
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 */
{
ut_ad(!auto_recalc_on || !auto_recalc_off);
ib_uint32_t stats_auto_recalc = 0;
if (auto_recalc_on) {
stats_auto_recalc |= DICT_STATS_AUTO_RECALC_ON;
}
if (auto_recalc_off) {
stats_auto_recalc |= DICT_STATS_AUTO_RECALC_OFF;
}
/* we rely on this assignment to be atomic */
table->stats_auto_recalc = stats_auto_recalc;
}
/** @return whether auto recalc is enabled for a given table*/
UNIV_INLINE
bool
dict_stats_auto_recalc_is_enabled(const dict_table_t* table)
{
/* we rely on this read to be atomic */
ib_uint32_t stats_auto_recalc = table->stats_auto_recalc;
if (stats_auto_recalc & DICT_STATS_AUTO_RECALC_ON) {
ut_ad(!(stats_auto_recalc & DICT_STATS_AUTO_RECALC_OFF));
return(true);
} else if (stats_auto_recalc & DICT_STATS_AUTO_RECALC_OFF) {
return(false);
} else {
return(srv_stats_auto_recalc);
}
}
/*********************************************************************//**
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 */
{
ut_ad(!mutex_own(&dict_sys.mutex));
if (table->stat_initialized) {
return;
}
dict_stats_upd_option_t opt;
if (dict_stats_is_persistent_enabled(table)) {
opt = DICT_STATS_FETCH_ONLY_IF_NOT_IN_MEMORY;
} else {
opt = DICT_STATS_RECALC_TRANSIENT;
}
dict_stats_update(table, opt);
}
/*********************************************************************//**
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 */
{
ut_ad(mutex_own(&dict_sys.mutex));
ut_a(table->get_ref_count() == 0);
rw_lock_x_lock(&table->stats_latch);
if (!table->stat_initialized) {
rw_lock_x_unlock(&table->stats_latch);
return;
}
table->stat_initialized = FALSE;
#ifdef UNIV_DEBUG_VALGRIND
UNIV_MEM_INVALID(&table->stat_n_rows,
sizeof(table->stat_n_rows));
UNIV_MEM_INVALID(&table->stat_clustered_index_size,
sizeof(table->stat_clustered_index_size));
UNIV_MEM_INVALID(&table->stat_sum_of_other_index_sizes,
sizeof(table->stat_sum_of_other_index_sizes));
UNIV_MEM_INVALID(&table->stat_modified_counter,
sizeof(table->stat_modified_counter));
dict_index_t* index;
for (index = dict_table_get_first_index(table);
index != NULL;
index = dict_table_get_next_index(index)) {
UNIV_MEM_INVALID(
index->stat_n_diff_key_vals,
index->n_uniq
* sizeof(index->stat_n_diff_key_vals[0]));
UNIV_MEM_INVALID(
index->stat_n_sample_sizes,
index->n_uniq
* sizeof(index->stat_n_sample_sizes[0]));
UNIV_MEM_INVALID(
index->stat_n_non_null_key_vals,
index->n_uniq
* sizeof(index->stat_n_non_null_key_vals[0]));
UNIV_MEM_INVALID(
&index->stat_index_size,
sizeof(index->stat_index_size));
UNIV_MEM_INVALID(
&index->stat_n_leaf_pages,
sizeof(index->stat_n_leaf_pages));
}
#endif /* UNIV_DEBUG_VALGRIND */
rw_lock_x_unlock(&table->stats_latch);
}
|