Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-03-01 06:23:21 0x7fc3840c8700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 26 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 38 srv_active, 0 srv_shutdown, 415 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 44
OS WAIT ARRAY INFO: signal count 43
RW-shared spins 1, rounds 2, OS waits 1
RW-excl spins 0, rounds 2, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 2.00 RW-shared, 2.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9916
Purge done for trx's n:o < 9916 undo n:o < 0 state: running but idle
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421952732994152, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421952732993280, 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
1434 OS file reads, 925 OS file writes, 320 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.31 writes/s, 0.27 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 7 buffer(s)
421.52 hash searches/s, 200.92 non-hash searches/s
---
LOG
---
Log sequence number 50992551
Log buffer assigned up to 50992551
Log buffer completed up to 50992551
Log written up to 50992551
Log flushed up to 50992551
Added dirty pages up to 50992551
Pages flushed up to 50992551
Last checkpoint at 50992551
204 log i/o's done, 0.08 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 641966
Buffer pool size 8192
Free buffers 6738
Database pages 1436
Old database pages 510
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 344, not young 1050
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1293, created 276, written 562
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: 1436, unzip_LRU len: 0
I/O sum[36]: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=372, Main thread ID=140477245368064 , state=sleeping
Number of rows inserted 17531, updated 394, deleted 0, read 443141
0.00 inserts/s, 0.04 updates/s, 0.00 deletes/s, 734.43 reads/s
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END OF INNODB MONITOR OUTPUT
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