Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-09-07 18:12:18 0x7f7650a9a700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 20 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 22 srv_active, 0 srv_shutdown, 668 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 33
OS WAIT ARRAY INFO: signal count 33
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 1, rounds 31, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 31.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9823
Purge done for trx's n:o < 9818 undo n:o < 0 state: running but idle
History list length 76
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421621701540456, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421621701539584, 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
1319 OS file reads, 481 OS file writes, 231 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 2 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 2 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
163.64 hash searches/s, 25.70 non-hash searches/s
---
LOG
---
Log sequence number 50974967
Log buffer assigned up to 50974967
Log buffer completed up to 50974967
Log written up to 50974967
Log flushed up to 50974967
Added dirty pages up to 50974967
Pages flushed up to 50974967
Last checkpoint at 50974967
116 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 624361
Buffer pool size 8192
Free buffers 6844
Database pages 1326
Old database pages 470
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 218, not young 692161
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1184, created 151, written 276
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: 1326, 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=371, Main thread ID=140146288785152 , state=sleeping
Number of rows inserted 254, updated 343, deleted 0, read 893806
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 301.68 reads/s
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END OF INNODB MONITOR OUTPUT
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