Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-03-01 07:48:36 0x136c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 40 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 8980 srv_active, 0 srv_shutdown, 26249 srv_idle
srv_master_thread log flush and writes: 35229
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 101500
OS WAIT ARRAY INFO: signal count 17916
RW-shared spins 5780, rounds 164248, OS waits 5285
RW-excl spins 141, rounds 1556, OS waits 41
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 28.42 RW-shared, 11.04 RW-excl, 30.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 21398
Purge done for trx's n:o < 21396 undo n:o < 0 state: running
History list length 16
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283579259662480, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259699992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259691656, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259687488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259683320, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259679152, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259674984, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259670816, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283579259666648, 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
16260 OS file reads, 91719 OS file writes, 59577 OS fsyncs
0.55 reads/s, 16384 avg bytes/read, 1.17 writes/s, 0.82 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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
2.50 hash searches/s, 4.77 non-hash searches/s
---
LOG
---
Log sequence number 11847391
Log flushed up to   11847391
Pages flushed up to 11843973
Last checkpoint at  11843964
0 pending log flushes, 0 pending chkp writes
30424 log i/o's done, 0.53 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 85136
Buffer pool size   1003
Free buffers       740
Database pages     259
Old database pages 0
Modified db pages  7
Percent of dirty pages(LRU & free pages): 0.700
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 16224, created 470, written 51429
0.55 reads/s, 0.00 creates/s, 0.55 writes/s
Buffer pool hit rate 959 / 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[41]:cur[3], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=11224, Main thread ID=1044, state: sleeping
Number of rows inserted 63, updated 10449, deleted 0, read 197103
0.00 inserts/s, 0.30 updates/s, 0.00 deletes/s, 2.55 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 10077
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================