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
|
drop table if exists t1,t2,v1,v2,v3;
drop view if exists t1,t2,v1,v2,v3;
set GLOBAL query_cache_size=1355776;
flush status;
create table t1 (a int, b int);
create view v1 (c,d) as select sql_no_cache a,b from t1;
create view v2 (c,d) as select a+rand(),b from t1;
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 0
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 0
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 0
select * from v1;
c d
select * from v2;
c d
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 0
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 0
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 0
select * from v1;
c d
select * from v2;
c d
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 0
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 0
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 0
drop view v1,v2;
set query_cache_type=demand;
flush status;
create view v1 (c,d) as select sql_cache a,b from t1;
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 0
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 0
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 0
select * from v1;
c d
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 1
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 1
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 0
select * from t1;
a b
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 1
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 1
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 0
select * from v1;
c d
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 1
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 1
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 1
select * from t1;
a b
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 1
show status like "Qcache_inserts";
Variable_name Value
Qcache_inserts 1
show status like "Qcache_hits";
Variable_name Value
Qcache_hits 1
drop view v1;
set query_cache_type=default;
drop table t1;
create table t1 (a int);
insert into t1 values (1), (2), (3);
create view v1 as select a from t1 where a > 1;
select * from v1;
a
2
3
alter view v1 as select a from t1 where a > 2;
select * from v1;
a
3
drop view v1;
select * from v1;
ERROR 42S02: Table 'test.v1' doesn't exist
drop table t1;
create table t1 (a int, primary key (a), b int);
create table t2 (a int, primary key (a), b int);
insert into t2 values (1000, 2000);
create view v3 (a,b) as select t1.a as a, t2.a as b from t1, t2;
select * from v3;
a b
drop view v3;
drop table t1, t2;
create table t1(f1 int);
insert into t1 values(1),(2),(3);
create view v1 as select * from t1;
set query_cache_wlock_invalidate=1;
lock tables v1 read /*!32311 local */;
unlock tables;
set query_cache_wlock_invalidate=default;
drop view v1;
drop table t1;
set GLOBAL query_cache_size=default;
|
