Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-04-17 18:37:42 0x9b0c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 31 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 1935 srv_active, 0 srv_shutdown, 154420 srv_idle
srv_master_thread log flush and writes: 156355
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 25933
OS WAIT ARRAY INFO: signal count 13807
RW-shared spins 5444, rounds 126411, OS waits 3651
RW-excl spins 6768, rounds 44481, OS waits 782
RW-sx spins 13, rounds 232, OS waits 6
Spin rounds per wait: 23.22 RW-shared, 6.57 RW-excl, 17.85 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 809012
Purge done for trx's n:o < 809012 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283721034256600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283721034252432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283721034264936, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283721034260768, 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
224109 OS file reads, 70351 OS file writes, 30615 OS fsyncs
6.19 reads/s, 16384 avg bytes/read, 5.68 writes/s, 3.35 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 66, seg size 68, 2863 merges
merged operations:
 insert 8550, delete mark 176, delete 143
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 4 buffer(s)
Hash table size 4441, node heap has 3 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 3 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 4 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
6.23 hash searches/s, 14.10 non-hash searches/s
---
LOG
---
Log sequence number 2178956213
Log flushed up to   2178956213
Pages flushed up to 2178956213
Last checkpoint at  2178954970
0 pending log flushes, 0 pending chkp writes
17822 log i/o's done, 1.74 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 3252696
Buffer pool size   1003
Free buffers       729
Database pages     256
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 74170, not young 3298607
0.06 youngs/s, 0.71 non-youngs/s
Pages read 222806, created 708, written 48702
6.19 reads/s, 0.03 creates/s, 3.35 writes/s
Buffer pool hit rate 880 / 1000, young-making rate 1 / 1000 not 13 / 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[292]:cur[4], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=25856, Main thread ID=25988, state: sleeping
Number of rows inserted 7258, updated 5879, deleted 6, read 22681474
0.00 inserts/s, 0.84 updates/s, 0.00 deletes/s, 6.23 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 30712
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================