Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-02-23 07:02:22 0x7f6dfb98a700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 34 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 16 srv_active, 0 srv_shutdown, 78 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 53
OS WAIT ARRAY INFO: signal count 53
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 1, rounds 31, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 31.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9868
Purge done for trx's n:o < 9868 undo n:o < 0 state: running but idle
History list length 99
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421585909275240, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421585909274368, 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
1323 OS file reads, 533 OS file writes, 206 OS fsyncs
2.79 reads/s, 16060 avg bytes/read, 5.71 writes/s, 2.65 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 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 1 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 6 buffer(s)
604.34 hash searches/s, 266.79 non-hash searches/s
---
LOG
---
Log sequence number 50974644
Log buffer assigned up to 50974644
Log buffer completed up to 50974644
Log written up to 50974644
Log flushed up to 50974644
Added dirty pages up to 50974644
Pages flushed up to 50974644
Last checkpoint at 50974644
155 log i/o's done, 2.58 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 625626
Buffer pool size 8192
Free buffers 6823
Database pages 1355
Old database pages 519
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1210, created 145, written 316
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 999 / 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: 1355, unzip_LRU len: 0
I/O sum[0]: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=373, Main thread ID=140110419924736 , state=sleeping
Number of rows inserted 18, updated 366, deleted 0, read 88478
0.32 inserts/s, 1.00 updates/s, 0.00 deletes/s, 1026.97 reads/s
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END OF INNODB MONITOR OUTPUT
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