Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-11-26 04:48:54 0x7f20e008d700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 4 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 30 srv_active, 0 srv_shutdown, 156 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 123
OS WAIT ARRAY INFO: signal count 122
RW-shared spins 14, rounds 26, OS waits 12
RW-excl spins 29, rounds 649, OS waits 20
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.86 RW-shared, 22.38 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9945
Purge done for trx's n:o < 9944 undo n:o < 0 state: running but idle
History list length 14
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421254192171624, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421254192170752, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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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
1337 OS file reads, 1662 OS file writes, 534 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 2.75 writes/s, 2.00 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 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
404.40 hash searches/s, 87.73 non-hash searches/s
---
LOG
---
Log sequence number 51144415
Log buffer assigned up to 51144415
Log buffer completed up to 51144415
Log written up to 51144415
Log flushed up to 51144415
Added dirty pages up to 51144415
Pages flushed up to 51144352
Last checkpoint at 51144352
424 log i/o's done, 1.25 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 866472
Buffer pool size 8192
Free buffers 6754
Database pages 1422
Old database pages 504
Modified db pages 2
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 336, not young 4
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1242, created 187, written 1096
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1422, unzip_LRU len: 0
I/O sum[148]:cur[4], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=382, Main thread ID=139778706315008 , state=sleeping
Number of rows inserted 1807, updated 449, deleted 85, read 404216
0.25 inserts/s, 0.00 updates/s, 0.00 deletes/s, 461.88 reads/s
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END OF INNODB MONITOR OUTPUT
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