Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-02-14 20:18:35 0x7fa6eb251700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 45 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 18 srv_active, 0 srv_shutdown, 149 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 38
OS WAIT ARRAY INFO: signal count 38
RW-shared spins 1, rounds 1, OS waits 0
RW-excl spins 2, rounds 32, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.00 RW-shared, 16.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9824
Purge done for trx's n:o < 9823 undo n:o < 0 state: running but idle
History list length 75
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421831193258600, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421831193257728, 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
1252 OS file reads, 578 OS file writes, 193 OS fsyncs
0.11 reads/s, 13312 avg bytes/read, 0.24 writes/s, 0.18 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 6 buffer(s)
2059.60 hash searches/s, 1441.77 non-hash searches/s
---
LOG
---
Log sequence number 50965339
Log buffer assigned up to 50965339
Log buffer completed up to 50965339
Log written up to 50965339
Log flushed up to 50965339
Added dirty pages up to 50965339
Pages flushed up to 50962522
Last checkpoint at 50962522
117 log i/o's done, 0.24 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 821972
Buffer pool size 8192
Free buffers 6896
Database pages 1279
Old database pages 452
Modified db pages 16
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 181, not young 923
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1135, created 237, written 351
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: 1279, unzip_LRU len: 0
I/O sum[2]:cur[2], 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=140355708327680 , state=sleeping
Number of rows inserted 16446, updated 342, deleted 0, read 733242
0.00 inserts/s, 0.11 updates/s, 0.00 deletes/s, 2715.30 reads/s
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END OF INNODB MONITOR OUTPUT
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