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  • 查看MySql使用的数据库引擎

     查看使用的数据库引擎  show variables like '%storage_engine%';

     显示的使用的是InnoDB

     查看引擎状态   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
    ============================

    输出如下,以后一个个解释

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  • 原文地址:https://www.cnblogs.com/anyehome/p/13071646.html
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