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
|
#
# Test how SHOW EXPLAIN is represented in performance schema
#
--source include/have_debug.inc
--source include/have_perfschema.inc
# Like all other perfschema tests, we don't work on embedded server:
--source include/not_embedded.inc
# There is a query below that selects from P_S tables.
# Remove possible history that could confuse it
truncate table performance_schema.events_statements_history_long;
truncate table performance_schema.events_stages_history_long;
--disable_warnings
drop table if exists t0, t1;
--enable_warnings
select * from performance_schema.setup_instruments where name like '%show_explain%';
--echo # We've got no instances
select * from performance_schema.cond_instances where name like '%show_explain%';
--echo # Check out if our cond is hit.
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
let $thr1=`select connection_id()`;
connect (con1, localhost, root,,);
connection con1;
let $thr2=`select connection_id()`;
connection default;
let $wait_condition= select State='show_explain_trap' from information_schema.processlist where id=$thr2;
#
# Test SHOW EXPLAIN for simple queries
#
connection con1;
set @show_explain_probe_select_id=1;
set debug_dbug='d,show_explain_probe_join_exec_start';
send select count(*) from t0 where a < 100000;
connection default;
--source include/wait_condition.inc
evalp show explain for $thr2;
connection con1;
reap;
set debug_dbug='';
evalp select event_name
from
performance_schema.events_stages_history_long join
performance_schema.threads using (thread_id)
where
event_name like '%show explain' and
processlist_id=$thr1;
drop table t0;
|
