Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variable
|
Bufferpool
|
InnoDB status
]
=====================================
2025-09-16 05:53:51 0x7f51f4ff9700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 19 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 16 srv_active, 0 srv_shutdown, 466 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 69
OS WAIT ARRAY INFO: signal count 69
RW-shared spins 3, rounds 5, OS waits 2
RW-excl spins 1, rounds 30, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.67 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9862
Purge done for trx's n:o < 9860 undo n:o < 0 state: running but idle
History list length 102
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421465539213928, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421465539213056, 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
1313 OS file reads, 567 OS file writes, 226 OS fsyncs
0.05 reads/s, 16384 avg bytes/read, 0.00 writes/s, 0.00 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 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 2 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
895.06 hash searches/s, 396.19 non-hash searches/s
---
LOG
---
Log sequence number 50975570
Log buffer assigned up to 50975570
Log buffer completed up to 50975570
Log written up to 50975570
Log flushed up to 50975570
Added dirty pages up to 50975570
Pages flushed up to 50975570
Last checkpoint at 50975570
171 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 581140
Buffer pool size 8192
Free buffers 6821
Database pages 1356
Old database pages 520
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1212, created 144, written 327
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: 1356, unzip_LRU len: 0
I/O sum[0]:cur[1], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=374, Main thread ID=139990124381952 , state=sleeping
Number of rows inserted 12, updated 367, deleted 2, read 334630
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1756.59 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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