Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-07-12 10:35:11 0x7f7394050700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 19 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 18 srv_active, 0 srv_shutdown, 244 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 47
OS WAIT ARRAY INFO: signal count 47
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 8, rounds 194, OS waits 6
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 24.25 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9855
Purge done for trx's n:o < 9855 undo n:o < 0 state: running but idle
History list length 80
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421609404144232, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421609404143360, 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
1277 OS file reads, 991 OS file writes, 261 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.47 writes/s, 0.42 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 0 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 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
303.41 hash searches/s, 90.05 non-hash searches/s
---
LOG
---
Log sequence number 51068899
Log buffer assigned up to 51068899
Log buffer completed up to 51068899
Log written up to 51068899
Log flushed up to 51068899
Added dirty pages up to 51068899
Pages flushed up to 51068899
Last checkpoint at 51068899
232 log i/o's done, 0.11 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 589099
Buffer pool size 8192
Free buffers 6841
Database pages 1338
Old database pages 500
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 155, not young 276
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1168, created 349, written 589
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: 1338, unzip_LRU len: 0
I/O sum[100]: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=364, Main thread ID=140133916419840 , state=sleeping
Number of rows inserted 32926, updated 497, deleted 0, read 228857
0.00 inserts/s, 0.05 updates/s, 0.00 deletes/s, 802.22 reads/s
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END OF INNODB MONITOR OUTPUT
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