Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-03-18 11:34:52 0x7f10501f5700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 1 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 41 srv_active, 0 srv_shutdown, 204 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 67
OS WAIT ARRAY INFO: signal count 67
RW-shared spins 4, rounds 7, OS waits 3
RW-excl spins 2, rounds 6, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.75 RW-shared, 3.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9908
Purge done for trx's n:o < 9908 undo n:o < 0 state: running but idle
History list length 24
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421183194950248, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421183194949376, 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
1324 OS file reads, 1096 OS file writes, 402 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 1 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 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
224.78 hash searches/s, 15.98 non-hash searches/s
---
LOG
---
Log sequence number 51012361
Log buffer assigned up to 51012361
Log buffer completed up to 51012361
Log written up to 51012361
Log flushed up to 51012361
Added dirty pages up to 51012361
Pages flushed up to 51012361
Last checkpoint at 51012361
240 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 701580
Buffer pool size 8192
Free buffers 6852
Database pages 1325
Old database pages 472
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 351, not young 1806
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1177, created 244, written 691
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: 1325, unzip_LRU len: 0
I/O sum[58]:cur[0], 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=374, Main thread ID=139707708024576 , state=sleeping
Number of rows inserted 16608, updated 384, deleted 17, read 521858
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 590.41 reads/s
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END OF INNODB MONITOR OUTPUT
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