Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-09-05 13:11:46 0x7f447dd89700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 50 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 28 srv_active, 0 srv_shutdown, 630 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 92
OS WAIT ARRAY INFO: signal count 88
RW-shared spins 6, rounds 10, OS waits 4
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
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TRANSACTIONS
------------
Trx id counter 9960
Purge done for trx's n:o < 9960 undo n:o < 0 state: running but idle
History list length 17
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421407135849064, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421407135848192, 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
1468 OS file reads, 1295 OS file writes, 423 OS fsyncs
0.02 reads/s, 16384 avg bytes/read, 0.98 writes/s, 0.62 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 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 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
176.92 hash searches/s, 64.56 non-hash searches/s
---
LOG
---
Log sequence number 51075454
Log buffer assigned up to 51075454
Log buffer completed up to 51075454
Log written up to 51075454
Log flushed up to 51075454
Added dirty pages up to 51075454
Pages flushed up to 51075454
Last checkpoint at 51075454
327 log i/o's done, 0.28 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 614629
Buffer pool size 8192
Free buffers 6675
Database pages 1505
Old database pages 535
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 283, not young 16
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1341, created 167, written 853
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: 1505, unzip_LRU len: 0
I/O sum[28]: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=139931650303744 , state=sleeping
Number of rows inserted 125, updated 431, deleted 27, read 347722
0.00 inserts/s, 0.08 updates/s, 0.00 deletes/s, 405.77 reads/s
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END OF INNODB MONITOR OUTPUT
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