Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-02-09 06:14:05 0x7f2727309700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 5 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 131 srv_active, 0 srv_shutdown, 665 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 236
OS WAIT ARRAY INFO: signal count 236
RW-shared spins 10, rounds 17, OS waits 7
RW-excl spins 9, rounds 270, OS waits 8
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.70 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 10369
Purge done for trx's n:o < 10369 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421281697450600, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421281697449728, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
1567 OS file reads, 3591 OS file writes, 1485 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
219.16 hash searches/s, 114.78 non-hash searches/s
---
LOG
---
Log sequence number          51276734
Log buffer assigned up to    51276734
Log buffer completed up to   51276734
Log written up to            51276734
Log flushed up to            51276734
Added dirty pages up to      51276734
Pages flushed up to          51276734
Last checkpoint at           51276734
985 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 931914
Buffer pool size   8192
Free buffers       6581
Database pages     1589
Old database pages 566
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 700, not young 692340
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1384, created 585, written 2071
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 1589, unzip_LRU len: 0
I/O sum[131]: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=372, Main thread ID=139806212556544 , state=sleeping
Number of rows inserted 100606, updated 625, deleted 19, read 2767546
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 448.71 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================