Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
=====================================
2026-01-11 00:24:50 0x7fb2c809a700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 54 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 27 srv_active, 0 srv_shutdown, 514 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 33
OS WAIT ARRAY INFO: signal count 33
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 2, rounds 60, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9885
Purge done for trx's n:o < 9885 undo n:o < 0 state: running but idle
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421881393613416, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421881393612544, 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
1466 OS file reads, 871 OS file writes, 294 OS fsyncs
0.06 reads/s, 16384 avg bytes/read, 0.39 writes/s, 0.22 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 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 30 buffer(s)
349.46 hash searches/s, 117.78 non-hash searches/s
---
LOG
---
Log sequence number 50982684
Log buffer assigned up to 50982684
Log buffer completed up to 50982684
Log written up to 50982684
Log flushed up to 50982684
Added dirty pages up to 50982684
Pages flushed up to 50982684
Last checkpoint at 50982684
188 log i/o's done, 0.15 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 616445
Buffer pool size 8192
Free buffers 6649
Database pages 1472
Old database pages 539
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 293, not young 466
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1329, created 322, written 512
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 2 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1472, unzip_LRU len: 0
I/O sum[13]: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=370, Main thread ID=140405908645632 , state=sleeping
Number of rows inserted 32841, updated 361, deleted 0, read 380044
0.00 inserts/s, 0.07 updates/s, 0.00 deletes/s, 717.76 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
