Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-07-19 01:58:30 0x7fdc8c059700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 24 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 74 srv_active, 0 srv_shutdown, 687 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 147
OS WAIT ARRAY INFO: signal count 153
RW-shared spins 13, rounds 14, OS waits 1
RW-excl spins 3, rounds 91, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.08 RW-shared, 30.33 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10177
Purge done for trx's n:o < 10177 undo n:o < 0 state: running but idle
History list length 14
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422060724353640, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422060724352768, 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
1717 OS file reads, 1964 OS file writes, 712 OS fsyncs
0.33 reads/s, 16384 avg bytes/read, 1.67 writes/s, 1.17 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 8 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 32 buffer(s)
403.77 hash searches/s, 112.91 non-hash searches/s
---
LOG
---
Log sequence number 51046033
Log buffer assigned up to 51046033
Log buffer completed up to 51046033
Log written up to 51046033
Log flushed up to 51046033
Added dirty pages up to 51046033
Pages flushed up to 51046033
Last checkpoint at 51046033
494 log i/o's done, 0.67 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 831191
Buffer pool size 8192
Free buffers 6446
Database pages 1669
Old database pages 599
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 549, not young 156519
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1518, created 624, written 1071
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 1 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1669, unzip_LRU len: 0
I/O sum[60]: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=362, Main thread ID=140585240311552 , state=sleeping
Number of rows inserted 123443, updated 481, deleted 0, read 1729774
0.17 inserts/s, 0.17 updates/s, 0.00 deletes/s, 1235.16 reads/s
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END OF INNODB MONITOR OUTPUT
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