Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-01-24 01:49:51 0x7eff0c1396c0 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 2 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 10646 srv_active, 0 srv_shutdown, 280816 srv_idle
srv_master_thread log flush and writes: 291412
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 29785
OS WAIT ARRAY INFO: signal count 22600
RW-shared spins 2061, rounds 61800, OS waits 2055
RW-excl spins 41, rounds 1327, OS waits 39
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.99 RW-shared, 32.37 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 85829
Purge done for trx's n:o < 85829 undo n:o < 0 state: running but idle
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421109196173816, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196169600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196161168, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196165384, 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
26407 OS file reads, 185332 OS file writes, 92594 OS fsyncs
9.50 reads/s, 16384 avg bytes/read, 30.48 writes/s, 13.49 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)
24.99 hash searches/s, 95.45 non-hash searches/s
---
LOG
---
Log sequence number 37377582
Log flushed up to   37377562
Pages flushed up to 37367400
Last checkpoint at  37356816
0 pending log flushes, 0 pending chkp writes
48330 log i/o's done, 7.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1002
Free buffers       741
Database pages     259
Old database pages 0
Modified db pages  23
Percent of dirty pages(LRU & free pages): 2.298
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 26373, created 1164, written 120118
9.50 reads/s, 0.00 creates/s, 20.49 writes/s
Buffer pool hit rate 973 / 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: 259, unzip_LRU len: 0
I/O sum[488]:cur[6], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=286, Main thread ID=139633892763328, state: sleeping
Number of rows inserted 56, updated 32403, deleted 0, read 582933
0.00 inserts/s, 6.00 updates/s, 0.00 deletes/s, 23.99 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 25334
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================