Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variabel
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Penampungan Penyangga
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Status InnoDB
]
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2025-11-04 06:12:09 0x7fcb940bd700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 11 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 50 srv_active, 0 srv_shutdown, 631 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 107
OS WAIT ARRAY INFO: signal count 107
RW-shared spins 3, rounds 5, OS waits 2
RW-excl spins 4, rounds 120, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.67 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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LATEST FOREIGN KEY ERROR
------------------------
2025-11-04 06:12:09 0x7fcb8c062700 Transaction:
TRANSACTION 10076, 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 4467, OS thread handle 140512204302080, query id 48011 192.168.30.20 root update
INSERT INTO MARK (mark_id, student_id, subject, marks) VALUES
(101, 1, 'DBMS', 85),
(102, 2, 'DBMS', 90),
(103, 3, 'DBMS', 78),
(104, 5, 'DBMS', 88)
Foreign key constraint fails for table `JOSH`.`MARK`:
,
CONSTRAINT `MARK_ibfk_1` FOREIGN KEY (`student_id`) REFERENCES `STUDENT` (`student_id`)
Trying to add in child table, in index student_id tuple:
DATA TUPLE: 2 fields;
0: len 4; hex 80000001; asc ;;
1: len 4; hex 80000065; asc e;;
But in parent table `JOSH`.`STUDENT`, 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 ;;
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TRANSACTIONS
------------
Trx id counter 10077
Purge done for trx's n:o < 10076 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421987348019816, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421987348018944, 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
1318 OS file reads, 2067 OS file writes, 784 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.09 writes/s, 0.09 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 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
538.50 hash searches/s, 139.81 non-hash searches/s
---
LOG
---
Log sequence number 51259188
Log buffer assigned up to 51259188
Log buffer completed up to 51259188
Log written up to 51259188
Log flushed up to 51259188
Added dirty pages up to 51259030
Pages flushed up to 51259030
Last checkpoint at 51259030
637 log i/o's done, 0.10 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 777160
Buffer pool size 8192
Free buffers 6781
Database pages 1395
Old database pages 494
Modified db pages 2
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 539, not young 890
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1193, created 214, written 1234
0.00 reads/s, 0.00 creates/s, 0.00 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: 1395, unzip_LRU len: 0
I/O sum[22]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=359, Main thread ID=140511862261504 , state=sleeping
Number of rows inserted 526, updated 636, deleted 0, read 819864
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1155.44 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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