Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-08-02 04:08:18 0x2cf8 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 60 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 42450 srv_active, 0 srv_shutdown, 197714 srv_idle
srv_master_thread log flush and writes: 240163
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 1055885
OS WAIT ARRAY INFO: signal count 243280
RW-shared spins 133996, rounds 3866555, OS waits 121893
RW-excl spins 62395, rounds 267158, OS waits 3256
RW-sx spins 25602, rounds 882533, OS waits 26681
Spin rounds per wait: 28.86 RW-shared, 4.28 RW-excl, 34.47 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 1223375
Purge done for trx's n:o < 1223375 undo n:o < 0 state: running but idle
History list length 24
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283655413543128, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283655413538960, 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
481118 OS file reads, 1028144 OS file writes, 496198 OS fsyncs
10.75 reads/s, 16384 avg bytes/read, 1.93 writes/s, 1.20 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 1805 merges
merged operations:
 insert 1996, delete mark 91, delete 10
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)
3.88 hash searches/s, 18.40 non-hash searches/s
---
LOG
---
Log sequence number 606682074
Log flushed up to   606682074
Pages flushed up to 606682074
Last checkpoint at  606675937
0 pending log flushes, 0 pending chkp writes
332668 log i/o's done, 0.68 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 320512
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 33458, not young 51715901
0.22 youngs/s, 82.27 non-youngs/s
Pages read 480988, created 4727, written 639640
10.75 reads/s, 0.08 creates/s, 1.07 writes/s
Buffer pool hit rate 980 / 1000, young-making rate 0 / 1000 not 149 / 1000
Pages read ahead 3.20/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 256, unzip_LRU len: 0
I/O sum[488]: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=3416, Main thread ID=3084, state: sleeping
Number of rows inserted 1203, updated 39717, deleted 95, read 498072184
0.00 inserts/s, 0.38 updates/s, 0.00 deletes/s, 2731.02 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5260
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================