Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-11-23 21:42:38 0x7f2ef9577700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 48 srv_active, 0 srv_shutdown, 661 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 104
OS WAIT ARRAY INFO: signal count 101
RW-shared spins 6, rounds 10, OS waits 4
RW-excl spins 5, rounds 151, OS waits 6
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.67 RW-shared, 30.20 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10063
Purge done for trx's n:o < 10061 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421315367955048, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421315367954176, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (write thread)
Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
ibuf aio reads:, log i/o's:, sync i/o's:
Pending flushes (fsync) log: 0; buffer pool: 0
1494 OS file reads, 1655 OS file writes, 613 OS fsyncs
0.03 reads/s, 16384 avg bytes/read, 5.79 writes/s, 1.00 fsyncs/s
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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 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
289.94 hash searches/s, 110.74 non-hash searches/s
---
LOG
---
Log sequence number 51211849
Log buffer assigned up to 51211849
Log buffer completed up to 51211849
Log written up to 51211849
Log flushed up to 51211849
Added dirty pages up to 51211849
Pages flushed up to 51211601
Last checkpoint at 51211601
493 log i/o's done, 0.93 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 750325
Buffer pool size 8192
Free buffers 6633
Database pages 1539
Old database pages 548
Modified db pages 3
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 534, not young 321065
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1351, created 206, written 995
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 1 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1539, unzip_LRU len: 0
I/O sum[179]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=372, Main thread ID=139839884420864 , state=sleeping
Number of rows inserted 569, updated 770, deleted 58, read 1318415
1.67 inserts/s, 3.92 updates/s, 1.49 deletes/s, 803.21 reads/s
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END OF INNODB MONITOR OUTPUT
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