Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-10-19 21:10:13 0x73c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 48 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 6923 srv_active, 0 srv_shutdown, 16541 srv_idle
srv_master_thread log flush and writes: 23464
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 24823
OS WAIT ARRAY INFO: signal count 13567
RW-shared spins 14287, rounds 273314, OS waits 7662
RW-excl spins 21759, rounds 84629, OS waits 1200
RW-sx spins 504, rounds 5601, OS waits 135
Spin rounds per wait: 19.13 RW-shared, 3.89 RW-excl, 11.11 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 20117
Purge done for trx's n:o < 20117 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283738057933088, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283738057928920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283738057924752, 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
39394 OS file reads, 82069 OS file writes, 48726 OS fsyncs
1.37 reads/s, 16384 avg bytes/read, 5.69 writes/s, 3.81 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 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)
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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
5.06 hash searches/s, 9.62 non-hash searches/s
---
LOG
---
Log sequence number 47246503
Log flushed up to   47246091
Pages flushed up to 47243545
Last checkpoint at  47240902
0 pending log flushes, 0 pending chkp writes
24862 log i/o's done, 1.90 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 403144
Buffer pool size   1003
Free buffers       742
Database pages     256
Old database pages 0
Modified db pages  19
Percent of dirty pages(LRU & free pages): 1.902
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 235, not young 91688
0.00 youngs/s, 0.00 non-youngs/s
Pages read 39350, created 3566, written 49038
1.37 reads/s, 0.02 creates/s, 3.15 writes/s
Buffer pool hit rate 968 / 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: 256, unzip_LRU len: 0
I/O sum[218]:cur[7], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=8680, Main thread ID=7376, state: sleeping
Number of rows inserted 107711, updated 6783, deleted 0, read 1548153
0.00 inserts/s, 0.65 updates/s, 0.00 deletes/s, 5.31 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 15375
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================