Storage engines

InnoDB

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

[ চলকসমূহ | বাফার পুল | InnoDB'র অবস্থা ]

=====================================
2025-11-13 06:59:03 0x7f259481d700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 60 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 13036 srv_active, 0 srv_shutdown, 11823 srv_idle
srv_master_thread log flush and writes: 24858
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 44902
OS WAIT ARRAY INFO: signal count 38968
RW-shared spins 0, rounds 18475, OS waits 9153
RW-excl spins 0, rounds 4385, OS waits 155
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 18475.00 RW-shared, 4385.00 RW-excl, 30.00 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2025-11-13 01:03:33 0x7f259497b700 Transaction:
TRANSACTION 45338, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
6 lock struct(s), heap size 1136, 10 row lock(s), undo log entries 6
MySQL thread id 40351, OS thread handle 139799383488256, query id 1344482 192.168.30.20 root Update
INSERT INTO LIBRO_AUTOR (CodLibro, CodAutor) VALUES
(1001, 801),
(1002, 801),
(1003, 802),
(1004, 803),
(1006, 803),
(1006, 804),
(1007, 803)
Foreign key constraint fails for table `Biblioteca_GCJM`.`LIBRO_AUTOR`:
,
  CONSTRAINT `LIBRO_AUTOR_ibfk_1` FOREIGN KEY (`CodLibro`) REFERENCES `LIBROS` (`CodLibro`) in parent table, in index PRIMARY tuple:
DATA TUPLE: 4 fields;
 0: len 4; hex 800003ef; asc     ;;
 1: len 4; hex 80000323; asc    #;;
 2: len 6; hex 00000000b11a; asc       ;;
 3: len 7; hex c80000021a1ebe; asc        ;;

But in parent table `Biblioteca_GCJM`.`LIBROS`, in index PRIMARY,
the closest match we can find is record:
PHYSICAL RECORD: n_fields 4; compact format; info bits 0
 0: len 4; hex 800003ee; asc     ;;
 1: len 6; hex 000000000000; asc       ;;
 2: len 7; hex 80000000000000; asc        ;;
 3: len 12; hex 436c697070657220352e3031; asc Clipper 5.01;;

------------
TRANSACTIONS
------------
Trx id counter 99759
Purge done for trx's n:o < 99759 undo n:o < 0 state: running but idle
History list length 14
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421274364736152, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421274364731896, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421274364727640, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421274364723384, 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
863 OS file reads, 199389 OS file writes, 97706 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 8.22 writes/s, 4.03 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)
4.22 hash searches/s, 1.82 non-hash searches/s
---
LOG
---
Log sequence number 48978807
Log flushed up to   48978686
Pages flushed up to 48978499
Last checkpoint at  48970195
0 pending log flushes, 0 pending chkp writes
61415 log i/o's done, 2.53 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 133600
Buffer pool size   16024
Free buffers       15047
Database pages     911
Old database pages 338
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 704, created 207, written 124833
0.00 reads/s, 0.00 creates/s, 5.17 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=900, Main thread ID=139798610167552, state: sleeping
Number of rows inserted 46, updated 29747, deleted 1, read 2071920
0.00 inserts/s, 1.23 updates/s, 0.00 deletes/s, 2.78 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 11025
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================