Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-07-01 22:27:35 0x7f5ec0335700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 37 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 29 srv_active, 0 srv_shutdown, 678 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 88
OS WAIT ARRAY INFO: signal count 88
RW-shared spins 7, rounds 13, OS waits 6
RW-excl spins 8, rounds 240, OS waits 8
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.86 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10004
Purge done for trx's n:o < 10003 undo n:o < 0 state: running but idle
History list length 30
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421520091142760, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421520091141888, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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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
1382 OS file reads, 1346 OS file writes, 483 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.22 writes/s, 0.19 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 0 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 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
241.37 hash searches/s, 51.03 non-hash searches/s
---
LOG
---
Log sequence number 51152319
Log buffer assigned up to 51152319
Log buffer completed up to 51152319
Log written up to 51152319
Log flushed up to 51152319
Added dirty pages up to 51152319
Pages flushed up to 51152319
Last checkpoint at 51152319
432 log i/o's done, 0.05 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 701039
Buffer pool size 8192
Free buffers 6746
Database pages 1430
Old database pages 547
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 1255, created 175, written 796
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: 1430, 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=367, Main thread ID=140044602914560 , state=sleeping
Number of rows inserted 189, updated 567, deleted 0, read 384049
0.00 inserts/s, 0.03 updates/s, 0.00 deletes/s, 396.72 reads/s
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END OF INNODB MONITOR OUTPUT
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