Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-12-24 10:28:46 0x7f22280ad700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 46 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 82 srv_active, 0 srv_shutdown, 696 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 162
OS WAIT ARRAY INFO: signal count 159
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 5, rounds 150, OS waits 5
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 10237
Purge done for trx's n:o < 10236 undo n:o < 0 state: running but idle
History list length 34
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421259825630672, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421259825629800, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421259825628928, 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
1590 OS file reads, 2048 OS file writes, 914 OS fsyncs
1.37 reads/s, 15652 avg bytes/read, 4.37 writes/s, 2.33 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 1 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 32 buffer(s)
757.85 hash searches/s, 398.88 non-hash searches/s
---
LOG
---
Log sequence number 51092946
Log buffer assigned up to 51092946
Log buffer completed up to 51092946
Log written up to 51092946
Log flushed up to 51092946
Added dirty pages up to 51092946
Pages flushed up to 51092946
Last checkpoint at 51092946
610 log i/o's done, 1.61 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 851350
Buffer pool size 8192
Free buffers 6540
Database pages 1575
Old database pages 562
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 790, not young 4700
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1417, created 277, written 1169
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: 1575, unzip_LRU len: 0
I/O sum[164]: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=371, Main thread ID=139784337954560 , state=sleeping
Number of rows inserted 34865, updated 515, deleted 0, read 771774
0.50 inserts/s, 0.76 updates/s, 0.00 deletes/s, 1264.60 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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