Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
=====================================
2025-07-14 22:27:30 0x7f204028b700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 55 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 51 srv_active, 0 srv_shutdown, 651 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 178
OS WAIT ARRAY INFO: signal count 167
RW-shared spins 18, rounds 33, OS waits 15
RW-excl spins 24, rounds 452, OS waits 12
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 1.83 RW-shared, 18.83 RW-excl, 30.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 10229
Purge done for trx's n:o < 10229 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421252050303592, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421252050302720, 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
1538 OS file reads, 3311 OS file writes, 906 OS fsyncs
0.18 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 0 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 2 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
231.74 hash searches/s, 49.85 non-hash searches/s
---
LOG
---
Log sequence number 51565837
Log buffer assigned up to 51565837
Log buffer completed up to 51565837
Log written up to 51565837
Log flushed up to 51565837
Added dirty pages up to 51565837
Pages flushed up to 51565837
Last checkpoint at 51565837
946 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 754348
Buffer pool size 8192
Free buffers 6531
Database pages 1644
Old database pages 594
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 727, not young 1421
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1391, created 870, written 1874
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: 1644, unzip_LRU len: 0
I/O sum[10]: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=371, Main thread ID=139776561719040 , state=sleeping
Number of rows inserted 115177, updated 997, deleted 193, read 837416
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 676.39 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
