Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-02-16 19:28:57 0x25d8 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 38 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 363 srv_active, 0 srv_shutdown, 56832 srv_idle
srv_master_thread log flush and writes: 57194
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 19703
OS WAIT ARRAY INFO: signal count 1256
RW-shared spins 629, rounds 14183, OS waits 436
RW-excl spins 482, rounds 3780, OS waits 82
RW-sx spins 7, rounds 42, OS waits 1
Spin rounds per wait: 22.55 RW-shared, 7.84 RW-excl, 6.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 3361
Purge done for trx's n:o < 3361 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284183965430120, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284183965425952, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284183965421784, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284183965434288, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284183965417616, 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: 1; buffer pool: 0
3866 OS file reads, 8810 OS file writes, 3815 OS fsyncs
3.00 reads/s, 16384 avg bytes/read, 5.47 writes/s, 2.87 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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
8.71 hash searches/s, 23.74 non-hash searches/s
---
LOG
---
Log sequence number 4544727
Log flushed up to   4544707
Pages flushed up to 4524359
Last checkpoint at  4523983
1 pending log flushes, 0 pending chkp writes
2420 log i/o's done, 1.79 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 110176
Buffer pool size   1003
Free buffers       720
Database pages     278
Old database pages 0
Modified db pages  48
Percent of dirty pages(LRU & free pages): 4.805
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 3830, created 403, written 5848
3.00 reads/s, 0.00 creates/s, 3.16 writes/s
Buffer pool hit rate 959 / 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: 278, unzip_LRU len: 0
I/O sum[366]:cur[22], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=1572, Main thread ID=5936, state: flushing log
Number of rows inserted 262, updated 1263, deleted 47, read 60302
0.00 inserts/s, 1.39 updates/s, 0.00 deletes/s, 8.79 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1016
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1.50 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================