Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-12-13 06:39:55 0x4f4 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 28 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 988 srv_active, 0 srv_shutdown, 1568773 srv_idle
srv_master_thread log flush and writes: 1548195
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 92840
OS WAIT ARRAY INFO: signal count 30533
RW-shared spins 1666, rounds 49626, OS waits 1476
RW-excl spins 31, rounds 323, OS waits 6
RW-sx spins 1, rounds 30, OS waits 0
Spin rounds per wait: 29.79 RW-shared, 10.42 RW-excl, 30.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 38429
Purge done for trx's n:o < 38429 undo n:o < 0 state: running but idle
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283086783144728, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783140560, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783153064, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783148896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783136392, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783128056, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783123888, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783119720, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783115552, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783111384, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783107216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283086783132224, 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
6196 OS file reads, 14858 OS file writes, 8982 OS fsyncs
3.32 reads/s, 16384 avg bytes/read, 8.25 writes/s, 3.25 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 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)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
10.93 hash searches/s, 37.43 non-hash searches/s
---
LOG
---
Log sequence number 22273319
Log flushed up to   22273299
Pages flushed up to 22270673
Last checkpoint at  22262213
0 pending log flushes, 0 pending chkp writes
5876 log i/o's done, 2.29 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 287960
Buffer pool size   1003
Free buffers       737
Database pages     258
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.502
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 6078, created 213, written 7951
3.32 reads/s, 0.29 creates/s, 5.61 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: 258, unzip_LRU len: 0
I/O sum[230]:cur[20], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=3332, Main thread ID=4840, state: sleeping
Number of rows inserted 59, updated 1744, deleted 3, read 93798
0.00 inserts/s, 1.64 updates/s, 0.00 deletes/s, 21.36 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1739
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================