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MySQL - SHOW ENGINE Statement
MySQL SHOW ENGINE Statement
The MySQL SHOW ENGINE statement displays the operation information about the specified engine.
Syntax
Following is the syntax of the MySQL SHOW ENGINE Statement −
SHOW ENGINE engine_name {STATUS | MUTEX}
Example
Following query displays the status of the engine INNODB.
SHOW ENGINE INNODB STATUS\G;
Output
The above mysql query produces the following output −
*************** 1. row *************** Type: InnoDB Name: Status: ===================================== 2021-05-15 12:06:23 0x2dd8 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 10 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 8 srv_active, 0 srv_shutdown, 3265 srv_idle srv_master_thread log flush and writes: 0 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 42 OS WAIT ARRAY INFO: signal count 42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ------------ TRANSACTIONS ------------ Trx id counter 69645 Purge done for trx's n:o < 69640 undo n:o < 0 state: running but idle History list length 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -------- FILE I/O -------- I/O thread 0 state: wait Windows aio (insert buffer thread) I/O thread 1 state: wait Windows aio (log thread) I/O thread 2 state: wait Windows aio (read thread) I/O thread 3 state: wait Windows aio (read thread) I/O thread 4 state: wait Windows aio (read thread) I/O thread 5 state: wait Windows aio (read thread) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 0, seg size 2, 0 merges merged operations: insert 0, delete mark 0, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 2267, node heap has 0 buffer(s) Hash table size 2267, node heap has 0 buffer(s) Hash table size 2267, node heap has 0 buffer(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . --- LOG --- Log sequence number 62802072 Log buffer assigned up to 62802072 Log buffer completed up to 62802072 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 8585216 Dictionary memory allocated 391033 Buffer pool size 512 Free buffers 255 Database pages 256 Old database pages 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Process ID=13048, Main thread ID=0000000000001D90 , state=sleeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ---------------------------- END OF INNODB MONITOR OUTPUT ============================
Example
Following query displays the status of the engine PERFORMANCE_SCHEMA −
SHOW ENGINE PERFORMANCE_SCHEMA STATUS\G;
Output
After executing the above query, it will produce the following output −
*************** 1. row *************** Type: performance_schema Name: events_waits_current.size Status: 168 *************** 2. row *************** Type: performance_schema Name: events_waits_current.count Status: 1536 *************** 3. row *************** Type: performance_schema Name: events_waits_history.size Status: 168 *************** 4. row *************** Type: performance_schema Name: events_waits_history.count Status: 2560 *************** 5. row *************** Type: performance_schema Name: events_waits_history.memory Status: 430080 *************** 6. row *************** Type: performance_schema Name: events_waits_history_long.size Status: 168 *************** 7. row *************** Type: performance_schema Name: events_waits_history_long.count Status: 10000 *************** 8. row *************** Type: performance_schema Name: events_waits_history_long.memory Status: 1680000 *************** 9. row *************** Type: performance_schema Name: (pfs_mutex_class).size Status: 256 *************** 10. row *************** Type: performance_schema Name: (pfs_mutex_class).count Status: 350 *************** 11. row *************** Type: performance_schema Name: (pfs_mutex_class).memory Status: 89600 *************** 12. row *************** Type: performance_schema Name: (pfs_rwlock_class).size Status: 256 *************** 13. row *************** Type: performance_schema Name: (pfs_rwlock_class).count Status: 60 *************** 14. row *************** Type: performance_schema Name: (pfs_rwlock_class).memory Status: 15360 *************** 15. row *************** Type: performance_schema Name: (pfs_cond_class).size Status: 256 *************** 16. row *************** Type: performance_schema Name: (pfs_cond_class).count Status: 150 *************** 17. row *************** Type: performance_schema Name: (pfs_cond_class).memory Status: 38400 *************** 18. row *************** Type: performance_schema Name: (pfs_thread_class).size Status: 256 *************** 19. row *************** Type: performance_schema Name: (pfs_thread_class).count Status: 100 ************** 20. row *************** Type: performance_schema Name: (pfs_thread_class).memory Status: 25600 .......................... .......................... ..........................
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