Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-12-15 05:01:10 0x7f0858b0b700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 23 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 4 srv_active, 0 srv_shutdown, 19 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 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
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TRANSACTIONS
------------
Trx id counter 9764
Purge done for trx's n:o < 9764 undo n:o < 0 state: running but idle
History list length 58
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421149384125032, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421149384124160, 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
1204 OS file reads, 277 OS file writes, 71 OS fsyncs
50.16 reads/s, 20515 avg bytes/read, 11.54 writes/s, 2.96 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 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)
418.29 hash searches/s, 344.33 non-hash searches/s
---
LOG
---
Log sequence number 50953800
Log buffer assigned up to 50953800
Log buffer completed up to 50953800
Log written up to 50953800
Log flushed up to 50953800
Added dirty pages up to 50953800
Pages flushed up to 50953800
Last checkpoint at 50953800
52 log i/o's done, 2.17 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 491516
Buffer pool size 8192
Free buffers 6927
Database pages 1255
Old database pages 483
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 1113, created 142, written 188
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 976 / 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: 1255, 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
0 read views open inside InnoDB
Process ID=364, Main thread ID=139673899050752 , state=sleeping
Number of rows inserted 7, updated 325, deleted 0, read 21923
0.30 inserts/s, 14.13 updates/s, 0.00 deletes/s, 953.13 reads/s
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END OF INNODB MONITOR OUTPUT
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