Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-03-22 22:46:18 0x7fb9bc136700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 30 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5 srv_active, 0 srv_shutdown, 25 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 12
OS WAIT ARRAY INFO: signal count 12
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9757
Purge done for trx's n:o < 9756 undo n:o < 0 state: running but idle
History list length 56
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421910864378472, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421910864377600, 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
1141 OS file reads, 258 OS file writes, 61 OS fsyncs
36.81 reads/s, 20716 avg bytes/read, 8.32 writes/s, 1.97 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 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 4 buffer(s)
3963.13 hash searches/s, 3230.76 non-hash searches/s
---
LOG
---
Log sequence number 50952003
Log buffer assigned up to 50952003
Log buffer completed up to 50952003
Log written up to 50952003
Log flushed up to 50952003
Added dirty pages up to 50952003
Pages flushed up to 50952003
Last checkpoint at 50952003
40 log i/o's done, 1.29 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 494469
Buffer pool size 8192
Free buffers 6993
Database pages 1188
Old database pages 427
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 33, not young 10
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1046, created 145, written 179
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 998 / 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: 1188, unzip_LRU len: 0
I/O sum[8]: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=369, Main thread ID=140435377829632 , state=sleeping
Number of rows inserted 47, updated 323, deleted 0, read 151344
1.57 inserts/s, 10.77 updates/s, 0.00 deletes/s, 5044.63 reads/s
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END OF INNODB MONITOR OUTPUT
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