Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-10-25 14:08:33 0x7f3a6c0c4700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 39 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 31 srv_active, 0 srv_shutdown, 434 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 70
OS WAIT ARRAY INFO: signal count 67
RW-shared spins 8, rounds 14, OS waits 6
RW-excl spins 5, rounds 150, OS waits 5
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.75 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 10083
Purge done for trx's n:o < 10082 undo n:o < 0 state: running but idle
History list length 17
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421364413598312, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421364413597440, 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
1253 OS file reads, 1856 OS file writes, 677 OS fsyncs
0.10 reads/s, 12544 avg bytes/read, 0.82 writes/s, 0.33 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 0 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 3 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
208.12 hash searches/s, 74.08 non-hash searches/s
---
LOG
---
Log sequence number 51395604
Log buffer assigned up to 51395604
Log buffer completed up to 51395604
Log written up to 51395604
Log flushed up to 51395604
Added dirty pages up to 51395604
Pages flushed up to 51395604
Last checkpoint at 51395604
673 log i/o's done, 0.34 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 782640
Buffer pool size 8192
Free buffers 6801
Database pages 1379
Old database pages 489
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 281, not young 220
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1136, created 249, written 1026
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: 1379, unzip_LRU len: 0
I/O sum[20]: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=381, Main thread ID=139888928409344 , state=sleeping
Number of rows inserted 495, updated 797, deleted 0, read 199189
0.00 inserts/s, 0.15 updates/s, 0.00 deletes/s, 354.50 reads/s
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END OF INNODB MONITOR OUTPUT
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