Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variable
|
Bufferpool
|
InnoDB status
]
=====================================
2026-03-16 14:59:56 0x7f66080e2700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 55 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 101 srv_active, 0 srv_shutdown, 746 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 215
OS WAIT ARRAY INFO: signal count 217
RW-shared spins 7, rounds 14, OS waits 7
RW-excl spins 7, rounds 210, OS waits 7
RW-sx spins 2, rounds 60, OS waits 2
Spin rounds per wait: 2.00 RW-shared, 30.00 RW-excl, 30.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 10291
Purge done for trx's n:o < 10291 undo n:o < 0 state: running but idle
History list length 14
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421551738030696, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421551738029824, 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: 1
1660 OS file reads, 2788 OS file writes, 1177 OS fsyncs
0.13 reads/s, 14189 avg bytes/read, 5.24 writes/s, 2.35 fsyncs/s
-------------------------------------
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 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 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
2665.44 hash searches/s, 1887.78 non-hash searches/s
---
LOG
---
Log sequence number 51315904
Log buffer assigned up to 51315904
Log buffer completed up to 51315904
Log written up to 51315904
Log flushed up to 51315904
Added dirty pages up to 51315904
Pages flushed up to 51315904
Last checkpoint at 51315904
852 log i/o's done, 1.45 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 914239
Buffer pool size 8192
Free buffers 6496
Database pages 1680
Old database pages 600
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 531, not young 801
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1471, created 312, written 1611
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: 1680, unzip_LRU len: 0
I/O sum[180]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=367, Main thread ID=140076253120256 , state=sleeping
Number of rows inserted 17083, updated 839, deleted 0, read 2993630
2.07 inserts/s, 0.65 updates/s, 0.00 deletes/s, 3593.72 reads/s
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END OF INNODB MONITOR OUTPUT
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