Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-12-10 06:10:44 0x7fd9c4a52700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 48 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 29 srv_active, 0 srv_shutdown, 567 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 75
OS WAIT ARRAY INFO: signal count 75
RW-shared spins 4, rounds 7, OS waits 3
RW-excl spins 4, rounds 96, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.75 RW-shared, 24.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9990
Purge done for trx's n:o < 9986 undo n:o < 0 state: running but idle
History list length 34
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422049189735016, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422049189734144, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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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
1367 OS file reads, 1319 OS file writes, 486 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.15 writes/s, 0.15 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 0 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
512.26 hash searches/s, 251.64 non-hash searches/s
---
LOG
---
Log sequence number 51219264
Log buffer assigned up to 51219264
Log buffer completed up to 51219264
Log written up to 51219264
Log flushed up to 51219264
Added dirty pages up to 51219264
Pages flushed up to 51219264
Last checkpoint at 51219264
445 log i/o's done, 0.04 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 713990
Buffer pool size 8192
Free buffers 6733
Database pages 1443
Old database pages 524
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 473, not young 505
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1250, created 202, written 744
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: 1443, unzip_LRU len: 0
I/O sum[3]: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=368, Main thread ID=140573706979072 , state=sleeping
Number of rows inserted 515, updated 806, deleted 0, read 554022
0.02 inserts/s, 0.00 updates/s, 0.00 deletes/s, 793.13 reads/s
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END OF INNODB MONITOR OUTPUT
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