Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-11-30 22:59:45 0x7f46c40af700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 43 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 38 srv_active, 0 srv_shutdown, 798 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 63
OS WAIT ARRAY INFO: signal count 63
RW-shared spins 2, rounds 3, OS waits 1
RW-excl spins 3, rounds 90, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.50 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10018
Purge done for trx's n:o < 10015 undo n:o < 0 state: running but idle
History list length 28
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421417082653288, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421417082652416, 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
1287 OS file reads, 1511 OS file writes, 536 OS fsyncs
0.09 reads/s, 12544 avg bytes/read, 0.74 writes/s, 0.51 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 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 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
398.22 hash searches/s, 221.86 non-hash searches/s
---
LOG
---
Log sequence number 51143707
Log buffer assigned up to 51143707
Log buffer completed up to 51143707
Log written up to 51143707
Log flushed up to 51143707
Added dirty pages up to 51143707
Pages flushed up to 51143707
Last checkpoint at 51143707
454 log i/o's done, 0.20 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 663895
Buffer pool size 8192
Free buffers 6829
Database pages 1344
Old database pages 476
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 494, not young 92
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1166, created 375, written 828
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: 1344, unzip_LRU len: 0
I/O sum[12]:cur[1], 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=379, Main thread ID=139941599196928 , state=sleeping
Number of rows inserted 49870, updated 551, deleted 0, read 648264
5.26 inserts/s, 0.02 updates/s, 0.00 deletes/s, 794.05 reads/s
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END OF INNODB MONITOR OUTPUT
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