Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-09-14 07:06:39 0x7f78e40ef700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 47 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 16 srv_active, 0 srv_shutdown, 335 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 38
OS WAIT ARRAY INFO: signal count 36
RW-shared spins 2, rounds 3, OS waits 1
RW-excl spins 5, rounds 128, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.50 RW-shared, 25.60 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9817
Purge done for trx's n:o < 9817 undo n:o < 0 state: running but idle
History list length 69
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421632368466536, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421632368465664, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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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
1221 OS file reads, 637 OS file writes, 235 OS fsyncs
0.09 reads/s, 12544 avg bytes/read, 0.36 writes/s, 0.19 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 1 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 5 buffer(s)
109.02 hash searches/s, 32.11 non-hash searches/s
---
LOG
---
Log sequence number 51016364
Log buffer assigned up to 51016364
Log buffer completed up to 51016364
Log written up to 51016364
Log flushed up to 51016364
Added dirty pages up to 51016364
Pages flushed up to 51016364
Last checkpoint at 51016364
174 log i/o's done, 0.11 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 581130
Buffer pool size 8192
Free buffers 6907
Database pages 1274
Old database pages 450
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 78, not young 209
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1118, created 159, written 383
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: 1274, unzip_LRU len: 0
I/O sum[22]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=369, Main thread ID=140156884432640 , state=sleeping
Number of rows inserted 149, updated 379, deleted 17, read 102767
0.00 inserts/s, 0.04 updates/s, 0.00 deletes/s, 326.38 reads/s
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END OF INNODB MONITOR OUTPUT
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