Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-04-19 19:07:29 0xa10 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 11 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5450 srv_active, 0 srv_shutdown, 361065 srv_idle
srv_master_thread log flush and writes: 366506
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 15124
OS WAIT ARRAY INFO: signal count 15089
RW-shared spins 10024, rounds 300430, OS waits 10013
RW-excl spins 152, rounds 1216, OS waits 6
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.97 RW-shared, 8.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 13706
Purge done for trx's n:o < 13706 undo n:o < 0 state: running but idle
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283762600493416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600489248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600485080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600480912, 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
11555 OS file reads, 67798 OS file writes, 50171 OS fsyncs
1.82 reads/s, 16384 avg bytes/read, 4.09 writes/s, 2.09 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 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)
14.00 hash searches/s, 27.27 non-hash searches/s
---
LOG
---
Log sequence number 9011005
Log flushed up to   9010985
Pages flushed up to 9006108
Last checkpoint at  8992125
0 pending log flushes, 0 pending chkp writes
31885 log i/o's done, 1.55 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 97656
Buffer pool size   1003
Free buffers       737
Database pages     260
Old database pages 0
Modified db pages  9
Percent of dirty pages(LRU & free pages): 0.902
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 11512, created 369, written 29494
1.82 reads/s, 0.00 creates/s, 2.36 writes/s
Buffer pool hit rate 980 / 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: 260, unzip_LRU len: 0
I/O sum[19]:cur[27], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=4532, Main thread ID=12972, state: sleeping
Number of rows inserted 120, updated 5746, deleted 0, read 6234640
0.00 inserts/s, 1.36 updates/s, 0.00 deletes/s, 66.27 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4870
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================