Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-09-17 05:42:35 0x7fbf600cb700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 35 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 74 srv_active, 0 srv_shutdown, 632 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 161
OS WAIT ARRAY INFO: signal count 154
RW-shared spins 12, rounds 23, OS waits 11
RW-excl spins 16, rounds 480, OS waits 16
RW-sx spins 2, rounds 60, OS waits 2
Spin rounds per wait: 1.92 RW-shared, 30.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10409
Purge done for trx's n:o < 10409 undo n:o < 0 state: running but idle
History list length 35
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421935452744296, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421935452743424, 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
1316 OS file reads, 3814 OS file writes, 1502 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.46 writes/s, 0.34 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 1 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 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
503.21 hash searches/s, 103.94 non-hash searches/s
---
LOG
---
Log sequence number 51902537
Log buffer assigned up to 51902537
Log buffer completed up to 51902537
Log written up to 51902537
Log flushed up to 51902537
Added dirty pages up to 51902537
Pages flushed up to 51902537
Last checkpoint at 51902537
1509 log i/o's done, 0.11 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 1091116
Buffer pool size 8192
Free buffers 6651
Database pages 1528
Old database pages 544
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 431, not young 175
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1177, created 357, written 1981
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: 1528, unzip_LRU len: 0
I/O sum[88]: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=140459969013504 , state=sleeping
Number of rows inserted 1150, updated 1926, deleted 1, read 506370
2.57 inserts/s, 0.03 updates/s, 0.00 deletes/s, 705.47 reads/s
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END OF INNODB MONITOR OUTPUT
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