Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-09-16 07:58:42 0x7fd2d8134700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 43 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 29 srv_active, 0 srv_shutdown, 744 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 70
OS WAIT ARRAY INFO: signal count 67
RW-shared spins 3, rounds 5, OS waits 2
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.67 RW-shared, 0.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9897
Purge done for trx's n:o < 9877 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422019069088056, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422019069087184, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422019069086312, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422019069085440, 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
1336 OS file reads, 1003 OS file writes, 401 OS fsyncs
0.93 reads/s, 13312 avg bytes/read, 0.60 writes/s, 0.42 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 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 0 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
171.53 hash searches/s, 48.18 non-hash searches/s
---
LOG
---
Log sequence number 51025944
Log buffer assigned up to 51025944
Log buffer completed up to 51025944
Log written up to 51025944
Log flushed up to 51025944
Added dirty pages up to 51025944
Pages flushed up to 51025944
Last checkpoint at 51025944
260 log i/o's done, 0.30 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 852224
Buffer pool size 8192
Free buffers 6825
Database pages 1352
Old database pages 486
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 311, not young 176
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1193, created 162, written 625
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 1 / 1000 not 3 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1352, unzip_LRU len: 0
I/O sum[49]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=370, Main thread ID=140543583770368 , state=sleeping
Number of rows inserted 166, updated 384, deleted 0, read 288425
0.14 inserts/s, 0.00 updates/s, 0.00 deletes/s, 533.08 reads/s
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END OF INNODB MONITOR OUTPUT
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