Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-11-02 17:19:33 0x7f42801ae700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 42 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 17 srv_active, 0 srv_shutdown, 208 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 54
OS WAIT ARRAY INFO: signal count 55
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 1, rounds 30, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9865
Purge done for trx's n:o < 9865 undo n:o < 0 state: running but idle
History list length 99
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421398709664360, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421398709663488, 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
1326 OS file reads, 539 OS file writes, 222 OS fsyncs
0.19 reads/s, 12544 avg bytes/read, 0.67 writes/s, 0.45 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 0 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 0 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
350.42 hash searches/s, 92.90 non-hash searches/s
---
LOG
---
Log sequence number 50972186
Log buffer assigned up to 50972186
Log buffer completed up to 50972186
Log written up to 50972186
Log flushed up to 50972186
Added dirty pages up to 50972186
Pages flushed up to 50972186
Last checkpoint at 50972186
158 log i/o's done, 0.24 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 564511
Buffer pool size 8192
Free buffers 6818
Database pages 1360
Old database pages 482
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 55, not young 6
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1217, created 146, written 314
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: 1360, unzip_LRU len: 0
I/O sum[16]: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=375, Main thread ID=139923225237248 , state=sleeping
Number of rows inserted 62, updated 366, deleted 0, read 374133
1.12 inserts/s, 0.05 updates/s, 0.00 deletes/s, 1001.62 reads/s
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END OF INNODB MONITOR OUTPUT
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