Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-09-16 02:53:26 0xfcc0 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 41 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 798 srv_active, 0 srv_shutdown, 557867 srv_idle
srv_master_thread log flush and writes: 555379
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 485
OS WAIT ARRAY INFO: signal count 453
RW-shared spins 0, rounds 782, OS waits 388
RW-excl spins 0, rounds 90, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 782.00 RW-shared, 90.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 14982
Purge done for trx's n:o < 14982 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283859072651696, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859072647480, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859072643264, 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
4837 OS file reads, 15014 OS file writes, 6958 OS fsyncs
1.05 reads/s, 16384 avg bytes/read, 4.51 writes/s, 2.32 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
1.29 hash searches/s, 4.68 non-hash searches/s
---
LOG
---
Log sequence number 9886414
Log flushed up to   9886414
Pages flushed up to 9886414
Last checkpoint at  9873894
0 pending log flushes, 0 pending chkp writes
4615 log i/o's done, 1.39 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 88128
Buffer pool size   1002
Free buffers       744
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4683, created 335, written 9457
1.05 reads/s, 0.00 creates/s, 2.80 writes/s
Buffer pool hit rate 951 / 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[191]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=9012, Main thread ID=2460, state: sleeping
Number of rows inserted 0, updated 2814, deleted 0, read 7859
0.00 inserts/s, 0.51 updates/s, 0.00 deletes/s, 1.29 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1537
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================