Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-12-28 20:19:37 0x308c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 57 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 14138 srv_active, 0 srv_shutdown, 171841 srv_idle
srv_master_thread log flush and writes: 185979
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 362365
OS WAIT ARRAY INFO: signal count 57210
RW-shared spins 3726, rounds 106928, OS waits 2800
RW-excl spins 264, rounds 6415, OS waits 169
RW-sx spins 4, rounds 106, OS waits 3
Spin rounds per wait: 28.70 RW-shared, 24.30 RW-excl, 26.50 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 61581
Purge done for trx's n:o < 61581 undo n:o < 0 state: running
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283497882640600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283497882636432, 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
42781 OS file reads, 184841 OS file writes, 99016 OS fsyncs
0.21 reads/s, 16384 avg bytes/read, 1.33 writes/s, 0.82 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 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 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)
1.49 hash searches/s, 3.12 non-hash searches/s
---
LOG
---
Log sequence number 33558911
Log flushed up to   33558891
Pages flushed up to 33557594
Last checkpoint at  33557585
0 pending log flushes, 0 pending chkp writes
51902 log i/o's done, 0.51 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       742
Database pages     257
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.300
Max dirty pages percent: 75.000
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 42745, created 1034, written 114862
0.21 reads/s, 0.00 creates/s, 0.70 writes/s
Buffer pool hit rate 980 / 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: 257, unzip_LRU len: 0
I/O sum[51]:cur[1], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=48072, Main thread ID=22320, state: sleeping
Number of rows inserted 56, updated 30406, deleted 0, read 602950
0.00 inserts/s, 0.21 updates/s, 0.00 deletes/s, 1.37 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 25088
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================