MySQL find SQL time-consuming bottleneck SHOW profiles

Source: Internet
Author: User

http://blog.csdn.net/k_scott/article/details/8804384

1. First check whether the profiling function is turned on [SQL]View PlainCopy
    1. SHOW VARIABLES like '%pro% ';

Or

[SQL]View PlainCopy
    1. SELECT @ @profiling;


2. Open Profiling

[SQL]View PlainCopy
    1. SET profiling=1;

3. Execute SQL statements

For example:

[SQL]View PlainCopy
    1. select   
    2.   table_schema as  ' Db name ',  
    3.   round ( sum ( data_length +  index_length )  / 1024 / 1024, 3 )  as  ' db size  (MB) ',   
    4.   round ( sum ( data_free )  / 1024 / 1024,  3 )  as  ' free space  (MB) '   
    5. from information_schema.tables   
    6. group by table_schema ;   

4. View Results

[SQL]View PlainCopy
    1. SHOW profiles;
[SQL]View PlainCopy
    1. SHOW profile all for QUERY 94;

94 is the query ID number.

SHOW Profiles Syntax:

[SQL]View PlainCopy
    1. SHOW profile [Type [, type] ...]
    2. [ForQUERY N]
    3. [LIMIT row_count [offset offset]]
    4. Type
    5. All
    6. | BLOCK IO
    7. | CONTEXT Switches
    8. | Cpu
    9. | Ipc
    10. | MEMORY
    11. | PAGE faults
    12. | SOURCE
    13. | SWAPS



MySQL find SQL time-consuming bottleneck SHOW profiles

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