Storage engines

InnoDB

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

[ متغيرات | Buffer Pool | وضع InnoDB ]

=====================================
2025-04-27 11:22:43 0x7faa6c216700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 38 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 1764 srv_active, 0 srv_shutdown, 39073 srv_idle
srv_master_thread log flush and writes: 40825
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 6714
OS WAIT ARRAY INFO: signal count 5407
RW-shared spins 0, rounds 6300, OS waits 3149
RW-excl spins 0, rounds 387, OS waits 17
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 6300.00 RW-shared, 387.00 RW-excl, 0.00 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2025-04-27 07:05:10 0x7faa6c6c9700 Transaction:
TRANSACTION 39805, 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 11472, OS thread handle 140369940223744, query id 322492 192.168.30.20 root Update
INSERT INTO reservations (customer_name, restaurant_id, reservation_time)
VALUES
('Alice Smith', 2, '2025-05-02 20:30:00'),
('Bob Johnson', 3, '2025-05-03 18:45:00'),
('Carol White', 1, '2025-05-04 21:15:00')
Foreign key constraint fails for table `restaurantdb`.`reservations`:
,
  CONSTRAINT `reservations_ibfk_1` FOREIGN KEY (`restaurant_id`) REFERENCES `restaurants` (`id`) ON DELETE CASCADE in parent table, in index restaurant_id tuple:
DATA TUPLE: 2 fields;
 0: len 4; hex 80000002; asc     ;;
 1: len 4; hex 80000016; asc     ;;

But in parent table `restaurantdb`.`restaurants`, 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 41422
Purge done for trx's n:o < 41422 undo n:o < 0 state: running but idle
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421844933730968, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421844933726712, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421844933722456, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421844933718200, 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
919 OS file reads, 21393 OS file writes, 15175 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.26 writes/s, 0.24 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)
0.13 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 11588556
Log flushed up to   11588556
Pages flushed up to 11588556
Last checkpoint at  11588547
0 pending log flushes, 0 pending chkp writes
9954 log i/o's done, 0.16 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 154976
Buffer pool size   16024
Free buffers       15011
Database pages     947
Old database pages 353
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
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 760, created 187, written 9707
0.00 reads/s, 0.00 creates/s, 0.08 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: 947, 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=140369186514688, state: sleeping
Number of rows inserted 5, updated 1917, deleted 0, read 904342
0.00 inserts/s, 0.03 updates/s, 0.00 deletes/s, 0.08 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2346
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================