Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-09-16 14:40:59 0x7f3d200e2700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 2 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 22 srv_active, 0 srv_shutdown, 589 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 86
OS WAIT ARRAY INFO: signal count 86
RW-shared spins 2, rounds 3, OS waits 1
RW-excl spins 3, rounds 90, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.50 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9945
Purge done for trx's n:o < 9945 undo n:o < 0 state: running but idle
History list length 38
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421376064756328, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421376064755456, 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
1479 OS file reads, 949 OS file writes, 347 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 2 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
0.00 hash searches/s, 1.00 non-hash searches/s
---
LOG
---
Log sequence number 51010160
Log buffer assigned up to 51010160
Log buffer completed up to 51010160
Log written up to 51010160
Log flushed up to 51010160
Added dirty pages up to 51010160
Pages flushed up to 51010160
Last checkpoint at 51010160
267 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 606335
Buffer pool size 8192
Free buffers 6670
Database pages 1503
Old database pages 534
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 387, not young 691876
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1352, created 154, written 583
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: 1503, unzip_LRU len: 0
I/O sum[56]: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=367, Main thread ID=139900578899712 , state=sleeping
Number of rows inserted 120, updated 409, deleted 0, read 3994776
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.50 reads/s
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END OF INNODB MONITOR OUTPUT
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