Storage engines

InnoDB

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

[ Variabler | Buffertutrymme | InnoDB-status ]

=====================================
2025-12-24 10:34:59 0x7f1428054700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 14 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 9967 srv_active, 0 srv_shutdown, 27845 srv_idle
srv_master_thread log flush and writes: 37810
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 30739
OS WAIT ARRAY INFO: signal count 28824
RW-shared spins 0, rounds 22097, OS waits 10996
RW-excl spins 0, rounds 1906, OS waits 66
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 22097.00 RW-shared, 1906.00 RW-excl, 0.00 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2025-12-24 03:11:16 0x7f14283ea700 Transaction:
TRANSACTION 49607, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
3 lock struct(s), heap size 1136, 1 row lock(s), undo log entries 1
MySQL thread id 143422, OS thread handle 139724551268096, query id 4804833 192.168.30.20 root Update
INSERT INTO mahasiswa (nim, nama, id_jurusan) VALUES
('001', 'Andi', 1),
('002', 'Budi', 2),
('003', 'Citra', 1),
('004', 'Dedi', NULL)
Foreign key constraint fails for table `mhs`.`mahasiswa`:
,
  CONSTRAINT `fk_mahasiswa_jurusan` FOREIGN KEY (`id_jurusan`) REFERENCES `jurusan` (`id_jurusan`) ON DELETE SET NULL ON UPDATE CASCADE in parent table, in index fk_mahasiswa_jurusan tuple:
DATA TUPLE: 2 fields;
 0: len 4; hex 80000001; asc     ;;
 1: len 3; hex 303031; asc 001;;

But in parent table `mhs`.`jurusan`, in index PRIMARY,
the closest match we can find is record:
PHYSICAL RECORD: n_fields 1; compact format; info bits 0
 0: len 8; hex 696e66696d756d00; asc infimum ;;

------------
TRANSACTIONS
------------
Trx id counter 78102
Purge done for trx's n:o < 78102 undo n:o < 0 state: running but idle
History list length 19
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421199527998104, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421199527993848, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421199527989592, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421199527985336, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
864 OS file reads, 143703 OS file writes, 75880 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 2.29 writes/s, 1.93 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 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 9 buffer(s)
Hash table size 69257, node heap has 2 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 3 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
1.71 hash searches/s, 0.21 non-hash searches/s
---
LOG
---
Log sequence number 36044661
Log flushed up to   36044546
Pages flushed up to 36043374
Last checkpoint at  36043365
0 pending log flushes, 0 pending chkp writes
51251 log i/o's done, 1.29 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 152304
Buffer pool size   16024
Free buffers       15047
Database pages     911
Old database pages 329
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.019
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 705, created 206, written 84144
0.00 reads/s, 0.00 creates/s, 0.79 writes/s
Buffer pool hit rate 1000 / 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: 911, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=922, Main thread ID=139723783784192, state: sleeping
Number of rows inserted 17, updated 19256, deleted 0, read 1533463
0.00 inserts/s, 0.36 updates/s, 0.00 deletes/s, 0.86 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4264
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================