Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-01-21 23:58:58 0x7fc7680e4700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 59 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 12 srv_active, 0 srv_shutdown, 778 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 26
OS WAIT ARRAY INFO: signal count 26
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
------------
TRANSACTIONS
------------
Trx id counter 9824
Purge done for trx's n:o < 9824 undo n:o < 0 state: running but idle
History list length 79
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421969451608680, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421969451607808, 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
1385 OS file reads, 389 OS file writes, 132 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
-------------------------------------
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 2 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)
Hash table size 34679, node heap has 7 buffer(s)
105.49 hash searches/s, 18.24 non-hash searches/s
---
LOG
---
Log sequence number 50961173
Log buffer assigned up to 50961173
Log buffer completed up to 50961173
Log written up to 50961173
Log flushed up to 50961173
Added dirty pages up to 50961173
Pages flushed up to 50961173
Last checkpoint at 50961173
87 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 571936
Buffer pool size 8192
Free buffers 6766
Database pages 1405
Old database pages 498
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 70, not young 42
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1262, created 152, written 245
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: 1405, unzip_LRU len: 0
I/O sum[0]: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=140493963867904 , state=sleeping
Number of rows inserted 137, updated 346, deleted 0, read 6799831
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 187.91 reads/s
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END OF INNODB MONITOR OUTPUT
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