Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
=====================================
2026-05-15 03:01:48 0x307f7e000 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 38 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 44221 srv_active, 0 srv_shutdown, 961766 srv_idle
srv_master_thread log flush and writes: 1005987
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 1202007
OS WAIT ARRAY INFO: signal count 954987
RW-shared spins 2178632, rounds 43584505, OS waits 580602
RW-excl spins 747627, rounds 9601386, OS waits 96748
RW-sx spins 2046, rounds 66634, OS waits 1529
Spin rounds per wait: 20.01 RW-shared, 12.84 RW-excl, 32.57 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 3066690
Purge done for trx's n:o < 3066690 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421645946593480, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421645946589288, 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
16332899 OS file reads, 769024 OS file writes, 350835 OS fsyncs
56.50 reads/s, 16384 avg bytes/read, 11.89 writes/s, 5.87 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 408, seg size 410, 24953 merges
merged operations:
insert 1113754, delete mark 181, delete 28
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 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
201.99 hash searches/s, 111.52 non-hash searches/s
---
LOG
---
Log sequence number 67166378475
Log flushed up to 67166378455
Pages flushed up to 67166308229
Last checkpoint at 67166304596
0 pending log flushes, 0 pending chkp writes
177710 log i/o's done, 4.32 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1199968
Buffer pool size 1003
Free buffers 721
Database pages 273
Old database pages 0
Modified db pages 108
Percent of dirty pages(LRU & free pages): 10.854
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 98448, not young 214630815
0.21 youngs/s, 598.80 non-youngs/s
Pages read 16332424, created 73400, written 519570
56.50 reads/s, 0.18 creates/s, 6.97 writes/s
Buffer pool hit rate 960 / 1000, young-making rate 0 / 1000 not 413 / 1000
Pages read ahead 11.79/s, evicted without access 1.26/s, Random read ahead 0.00/s
LRU len: 273, unzip_LRU len: 0
I/O sum[2087]:cur[1], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=1833, Main thread ID=13009563648, state: sleeping
Number of rows inserted 3843818, updated 97131, deleted 2257, read 1148207573
0.00 inserts/s, 3.50 updates/s, 0.00 deletes/s, 4496.99 reads/s
Number of system rows inserted 476, updated 0, deleted 0, read 728688
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
