Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-07-02 14:06:52 0x7fb786bb5700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 59 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 31 srv_active, 0 srv_shutdown, 332 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 75
OS WAIT ARRAY INFO: signal count 75
RW-shared spins 4, rounds 7, OS waits 3
RW-excl spins 6, rounds 180, OS waits 6
RW-sx spins 2, rounds 60, OS waits 2
Spin rounds per wait: 1.75 RW-shared, 30.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10103
Purge done for trx's n:o < 10102 undo n:o < 0 state: running but idle
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421902258727528, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421902258726656, 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
1551 OS file reads, 1704 OS file writes, 573 OS fsyncs
0.10 reads/s, 13824 avg bytes/read, 2.75 writes/s, 0.58 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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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 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 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 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
416.48 hash searches/s, 119.54 non-hash searches/s
---
LOG
---
Log sequence number 51177621
Log buffer assigned up to 51177621
Log buffer completed up to 51177621
Log written up to 51177621
Log flushed up to 51177621
Added dirty pages up to 51177621
Pages flushed up to 51177621
Last checkpoint at 51177621
538 log i/o's done, 0.32 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 756025
Buffer pool size 8192
Free buffers 6594
Database pages 1582
Old database pages 563
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 470, not young 2524
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1398, created 278, written 1002
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: 1582, unzip_LRU len: 0
I/O sum[138]: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=365, Main thread ID=140426771109632 , state=sleeping
Number of rows inserted 33016, updated 610, deleted 0, read 348682
0.00 inserts/s, 0.12 updates/s, 0.00 deletes/s, 719.46 reads/s
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END OF INNODB MONITOR OUTPUT
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