Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-11-05 09:40:06 0x7f23400cb700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 10 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 76 srv_active, 0 srv_shutdown, 482 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 129
OS WAIT ARRAY INFO: signal count 129
RW-shared spins 6, rounds 11, OS waits 5
RW-excl spins 8, rounds 240, OS waits 8
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 1.83 RW-shared, 30.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10194
Purge done for trx's n:o < 10194 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421264893119952, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421264893119080, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421264893120824, not started
mysql tables in use 8, locked 0
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421264893118208, 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
1541 OS file reads, 2515 OS file writes, 1043 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
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 0 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 7 buffer(s)
592.14 hash searches/s, 152.68 non-hash searches/s
---
LOG
---
Log sequence number 51323266
Log buffer assigned up to 51323266
Log buffer completed up to 51323266
Log written up to 51323266
Log flushed up to 51323266
Added dirty pages up to 51323266
Pages flushed up to 51323266
Last checkpoint at 51323266
790 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 826777
Buffer pool size 8192
Free buffers 6572
Database pages 1603
Old database pages 571
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 549, not young 858
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1386, created 238, written 1471
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: 1603, unzip_LRU len: 0
I/O sum[15]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Process ID=369, Main thread ID=139789408851712 , state=sleeping
Number of rows inserted 730, updated 690, deleted 13, read 972321
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1682.03 reads/s
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END OF INNODB MONITOR OUTPUT
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