Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-07-17 13:29:13 0x7a2c0d91e6c0 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 13 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 2664 srv_active, 0 srv_shutdown, 10597 srv_idle
srv_master_thread log flush and writes: 13260
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 2815
OS WAIT ARRAY INFO: signal count 1395
RW-shared spins 705, rounds 20791, OS waits 686
RW-excl spins 33, rounds 829, OS waits 24
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.49 RW-shared, 25.12 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 28812
Purge done for trx's n:o < 28812 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 415804358205704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 415804358201488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
5091 OS file reads, 35892 OS file writes, 19114 OS fsyncs
0.15 reads/s, 16384 avg bytes/read, 0.31 writes/s, 0.31 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 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
0.23 hash searches/s, 0.85 non-hash searches/s
---
LOG
---
Log sequence number 13033290
Log flushed up to   13033290
Pages flushed up to 13033290
Last checkpoint at  13033281
0 pending log flushes, 0 pending chkp writes
9889 log i/o's done, 0.31 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1003
Free buffers       743
Database pages     258
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 5057, created 326, written 22459
0.15 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 894 / 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: 258, unzip_LRU len: 0
I/O sum[28]: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=1749, Main thread ID=134328700880576, state: sleeping
Number of rows inserted 6, updated 5766, deleted 0, read 151374
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.23 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4317
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================