查看使用的數據庫引擎??show variables like '%storage_engine%';

顯示的使用的是InnoDB

查看引擎狀態? ?show engine innodb status

=====================================

2020-06-09 11:48:38 7fd22fb2c700 INNODB MONITOR OUTPUT

=====================================

Per second averages calculated from the last 0 seconds

-----------------

BACKGROUND THREAD

-----------------

srv_master_thread loops: 99893 srv_active, 0 srv_shutdown, 1024866 srv_idle

srv_master_thread log flush and writes: 1124757

----------

SEMAPHORES

----------

OS WAIT ARRAY INFO: reservation count 366976

OS WAIT ARRAY INFO: signal count 349471

Mutex spin waits 1394525, rounds 2643577, OS waits 41106

RW-shared spins 512553, rounds 12732271, OS waits 319778

RW-excl spins 4340, rounds 105641, OS waits 2110

Spin rounds per wait: 1.90 mutex, 24.84 RW-shared, 24.34 RW-excl

------------

TRANSACTIONS

------------

Trx id counter 464642414

Purge done for trx's n:o < 464631391 undo n:o < 0 state: running but idle

History list length 2461

LIST OF TRANSACTIONS FOR EACH SESSION:

MySQL thread id 143417, OS thread handle 0x7fd22e452700, query id 84732229 127.0.0.1 root cleaning up

show engine innodb status

#select * from information_schema.INNODB_TRX ;

#show variables like '%storage_engine%'

---TRANSACTION 464587469, not started

MySQL thread id 142688, OS thread handle 0x7fd425e75700, query id 84677131 127.0.0.1 root cleaning up

---TRANSACTION 464597349, not started

MySQL thread id 142687, OS thread handle 0x7fd22ebaf700, query id 84687094 127.0.0.1 root cleaning up

---TRANSACTION 464607470, not started

MySQL thread id 142686, OS thread handle 0x7fd22e71d700, query id 84697319 127.0.0.1 root cleaning up

---TRANSACTION 464607471, not started

MySQL thread id 142685, OS thread handle 0x7fd4240c0700, query id 84697320 127.0.0.1 root cleaning up

---TRANSACTION 464254382, not started

MySQL thread id 142684, OS thread handle 0x7fd22d69c700, query id 84336132 127.0.0.1 root cleaning up

---TRANSACTION 464608723, not started

MySQL thread id 142682, OS thread handle 0x7fd22ea6a700, query id 84698590 127.0.0.1 root cleaning up

---TRANSACTION 464642306, not started

--------

FILE I/O

--------

I/O thread 0 state: waiting for i/o request (insert buffer thread)

I/O thread 1 state: waiting for i/o request (log thread)

I/O thread 2 state: waiting for i/o request (read thread)

I/O thread 3 state: waiting for i/o request (read thread)

I/O thread 4 state: waiting for i/o request (read thread)

I/O thread 5 state: waiting for i/o request (read thread)

I/O thread 6 state: waiting for i/o request (write thread)

I/O thread 7 state: waiting for i/o request (write thread)

I/O thread 8 state: waiting for i/o request (write thread)

I/O thread 9 state: waiting for i/o request (write thread)

Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] ,

ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0

Pending flushes (fsync) log: 0; buffer pool: 0

174404 OS file reads, 1899052 OS file writes, 1503321 OS fsyncs

0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s

-------------------------------------

INSERT BUFFER AND ADAPTIVE HASH INDEX

-------------------------------------

Ibuf: size 1, free list len 2751, seg size 2753, 1233 merges

merged operations:

insert 1920, delete mark 605, delete 31

discarded operations:

insert 0, delete mark 0, delete 0

Hash table size 276671, node heap has 425 buffer(s)

0.00 hash searches/s, 0.00 non-hash searches/s

---

LOG

---

Log sequence number 381451654439

Log flushed up to 381451654439

Pages flushed up to 381451654439

Last checkpoint at 381451654439

0 pending log writes, 0 pending chkp writes

842557 log i/o's done, 0.00 log i/o's/second

----------------------

BUFFER POOL AND MEMORY

----------------------

Total memory allocated 137363456; in additional pool allocated 0

Dictionary memory allocated 1530044

Buffer pool size 8191

Free buffers 1024

Database pages 6742

Old database pages 2468

Modified db pages 0

Pending reads 0

Pending writes: LRU 0, flush list 0, single page 0

Pages made young 294210, not young 5207682

0.00 youngs/s, 0.00 non-youngs/s

Pages read 514664, created 5569, written 857904

0.00 reads/s, 0.00 creates/s, 0.00 writes/s

No buffer pool page gets since the last printout

Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s

LRU len: 6742, unzip_LRU len: 0

I/O sum[14]:cur[0], unzip sum[0]:cur[0]

--------------

ROW OPERATIONS

--------------

0 queries inside InnoDB, 0 queries in queue

0 read views open inside InnoDB

Main thread process no. 5866, id 140549256718080, state: sleeping

Number of rows inserted 258137, updated 519709, deleted 218944, read 2068368590

0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s

----------------------------

END OF INNODB MONITOR OUTPUT

============================

輸出如下，以后一個個解釋

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