Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-09-08 13:32:44 0x7fe6f0057700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 56 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 10 srv_active, 0 srv_shutdown, 106 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 23
OS WAIT ARRAY INFO: signal count 23
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 9782
Purge done for trx's n:o < 9782 undo n:o < 0 state: running but idle
History list length 64
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422104995678824, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422104995677952, 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
1236 OS file reads, 351 OS file writes, 124 OS fsyncs
0.07 reads/s, 12544 avg bytes/read, 0.48 writes/s, 0.36 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 0 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 0 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 2 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
461.96 hash searches/s, 239.19 non-hash searches/s
---
LOG
---
Log sequence number 50956837
Log buffer assigned up to 50956837
Log buffer completed up to 50956837
Log written up to 50956837
Log flushed up to 50956837
Added dirty pages up to 50956837
Pages flushed up to 50956837
Last checkpoint at 50956837
76 log i/o's done, 0.14 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 526249
Buffer pool size 8192
Free buffers 6910
Database pages 1273
Old database pages 449
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 42, not young 3
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1131, created 145, written 220
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: 1273, unzip_LRU len: 0
I/O sum[13]: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=140629506987776 , state=sleeping
Number of rows inserted 96, updated 331, deleted 0, read 89472
1.62 inserts/s, 0.02 updates/s, 0.00 deletes/s, 739.24 reads/s
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END OF INNODB MONITOR OUTPUT
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