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# We want to make sure that the common case of
# a connection which has not enabled tracing,
# is optimized, i.e. neither Opt_trace_context_impl nor
# Opt_trace_context_stmt is created.
set debug="d,no_new_opt_trace_stmt";
select 1;
1
1
select * from information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
set @a=25;
set debug="default";
set optimizer_trace="enabled=on";
select 2;
2
2
select * from information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
select 2 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select 2 AS `2`"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
set optimizer_trace="enabled=off";
set debug="d,no_new_opt_trace_stmt";
select 3;
3
3
select * from information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
select 2 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select 2 AS `2`"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0