Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-11-06 13:52:01 0x7f36340f0700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 7 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 29 srv_active, 0 srv_shutdown, 343 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 50
OS WAIT ARRAY INFO: signal count 53
RW-shared spins 9, rounds 14, OS waits 5
RW-excl spins 6, rounds 183, OS waits 9
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.56 RW-shared, 30.50 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9941
Purge done for trx's n:o < 9940 undo n:o < 0 state: running but idle
History list length 17
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421345785119032, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421345785118160, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421345785117288, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421345785116416, 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
1407 OS file reads, 1166 OS file writes, 435 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 2.00 writes/s, 1.57 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 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
402.09 hash searches/s, 149.84 non-hash searches/s
---
LOG
---
Log sequence number 51128991
Log buffer assigned up to 51128991
Log buffer completed up to 51128991
Log written up to 51128991
Log flushed up to 51128991
Added dirty pages up to 51128991
Pages flushed up to 51128991
Last checkpoint at 51128991
335 log i/o's done, 0.57 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 657971
Buffer pool size 8192
Free buffers 6724
Database pages 1451
Old database pages 555
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1276, created 175, written 715
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: 1451, unzip_LRU len: 0
I/O sum[0]: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=377, Main thread ID=139870296016640 , state=sleeping
Number of rows inserted 162, updated 540, deleted 0, read 1623895
0.14 inserts/s, 0.00 updates/s, 0.00 deletes/s, 950.44 reads/s
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END OF INNODB MONITOR OUTPUT
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