Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-02-05 01:21:57 0x7f9af405d700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 3 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 19 srv_active, 0 srv_shutdown, 350 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 47
OS WAIT ARRAY INFO: signal count 47
RW-shared spins 3, rounds 4, OS waits 1
RW-excl spins 4, rounds 93, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.33 RW-shared, 23.25 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9972
Purge done for trx's n:o < 9972 undo n:o < 0 state: running but idle
History list length 14
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421778611867088, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421778611866216, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421778611865344, 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
1543 OS file reads, 1047 OS file writes, 359 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 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 5 buffer(s)
2999.33 hash searches/s, 2398.20 non-hash searches/s
---
LOG
---
Log sequence number 51074145
Log buffer assigned up to 51074145
Log buffer completed up to 51074145
Log written up to 51074145
Log flushed up to 51074145
Added dirty pages up to 51074145
Pages flushed up to 51074145
Last checkpoint at 51074145
318 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 822822
Buffer pool size 8192
Free buffers 6668
Database pages 1507
Old database pages 536
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 533, not young 5511
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1340, created 170, written 635
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: 1507, unzip_LRU len: 0
I/O sum[155]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=368, Main thread ID=140303128516352 , state=sleeping
Number of rows inserted 156, updated 500, deleted 0, read 1815969
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 3687.77 reads/s
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END OF INNODB MONITOR OUTPUT
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