Storage engines

InnoDB

Supports transactions, row-level locking, foreign keys and encryption for tables

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-03-10 20:15:50 0x3264 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 31 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 17947 srv_active, 0 srv_shutdown, 12731 srv_idle
srv_master_thread log flush and writes: 30678
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 675105
OS WAIT ARRAY INFO: signal count 151567
RW-shared spins 11436, rounds 337100, OS waits 10942
RW-excl spins 1601, rounds 9703, OS waits 140
RW-sx spins 4, rounds 90, OS waits 2
Spin rounds per wait: 29.48 RW-shared, 6.06 RW-excl, 22.50 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 901768
Purge done for trx's n:o < 901768 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283859989414248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989410080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989405912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989401744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
142287 OS file reads, 249543 OS file writes, 141482 OS fsyncs
1.23 reads/s, 16384 avg bytes/read, 4.81 writes/s, 3.06 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 3, seg size 5, 0 merges
merged operations:
 insert 0, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
4.29 hash searches/s, 6.26 non-hash searches/s
---
LOG
---
Log sequence number 127741756
Log flushed up to   127741756
Pages flushed up to 127741756
Last checkpoint at  127741282
0 pending log flushes, 0 pending chkp writes
75906 log i/o's done, 1.87 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 4306880
Buffer pool size   1003
Free buffers       739
Database pages     256
Old database pages 0
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1314, not young 618616
0.00 youngs/s, 0.00 non-youngs/s
Pages read 140563, created 2070, written 150423
1.23 reads/s, 0.00 creates/s, 2.55 writes/s
Buffer pool hit rate 965 / 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: 256, unzip_LRU len: 0
I/O sum[127]:cur[3], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=56288, Main thread ID=47692, state: sleeping
Number of rows inserted 1162, updated 33598, deleted 1162, read 5760886
0.00 inserts/s, 0.45 updates/s, 0.00 deletes/s, 32.93 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 317707
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================