Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-02-12 04:24:21 0x7f77eccf9700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 24 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 56 srv_active, 0 srv_shutdown, 456 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 186
OS WAIT ARRAY INFO: signal count 186
RW-shared spins 34, rounds 38, OS waits 4
RW-excl spins 9, rounds 82, OS waits 17
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.12 RW-shared, 9.11 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10069
Purge done for trx's n:o < 10068 undo n:o < 0 state: running but idle
History list length 36
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421628688506320, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421628688505448, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421628688504576, 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
1606 OS file reads, 1732 OS file writes, 521 OS fsyncs
0.21 reads/s, 13312 avg bytes/read, 1.75 writes/s, 1.33 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 8 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 32 buffer(s)
14230.99 hash searches/s, 12076.96 non-hash searches/s
---
LOG
---
Log sequence number 51014800
Log buffer assigned up to 51014800
Log buffer completed up to 51014800
Log written up to 51014800
Log flushed up to 51014800
Added dirty pages up to 51014800
Pages flushed up to 51014800
Last checkpoint at 51014800
353 log i/o's done, 0.54 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 831191
Buffer pool size 8192
Free buffers 6543
Database pages 1572
Old database pages 584
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 577, not young 897422
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1427, created 780, written 943
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: 1572, unzip_LRU len: 0
I/O sum[131]: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=371, Main thread ID=140153203115776 , state=sleeping
Number of rows inserted 149368, updated 441, deleted 0, read 10144287
3.83 inserts/s, 0.08 updates/s, 0.00 deletes/s, 16931.04 reads/s
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END OF INNODB MONITOR OUTPUT
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