Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-07-03 14:48:27 0x7fccd4081700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 38 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 9 srv_active, 0 srv_shutdown, 149 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 18
OS WAIT ARRAY INFO: signal count 18
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9780
Purge done for trx's n:o < 9780 undo n:o < 0 state: running but idle
History list length 59
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421992738570552, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421992738569680, not started
mysql tables in use 6, locked 0
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421992738567936, 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
1249 OS file reads, 323 OS file writes, 113 OS fsyncs
0.03 reads/s, 16384 avg bytes/read, 0.68 writes/s, 0.37 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 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 4 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
227.20 hash searches/s, 72.26 non-hash searches/s
---
LOG
---
Log sequence number 50956177
Log buffer assigned up to 50956177
Log buffer completed up to 50956177
Log written up to 50956177
Log flushed up to 50956177
Added dirty pages up to 50956177
Pages flushed up to 50956177
Last checkpoint at 50956177
64 log i/o's done, 0.30 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 593281
Buffer pool size 8192
Free buffers 6893
Database pages 1281
Old database pages 492
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 1138, created 143, written 211
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: 1281, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Process ID=370, Main thread ID=140517250643712 , state=sleeping
Number of rows inserted 11, updated 326, deleted 0, read 475775
0.00 inserts/s, 0.13 updates/s, 0.00 deletes/s, 409.31 reads/s
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END OF INNODB MONITOR OUTPUT
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