Storage engines

InnoDB

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

[ විචල්‍යනයන් | අන්තරාච එකතුව | InnoDB තත්වය ]

=====================================
2026-01-18 14:02:34 0x7f84203c8700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 54 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 14313 srv_active, 0 srv_shutdown, 35833 srv_idle
srv_master_thread log flush and writes: 50135
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 40076
OS WAIT ARRAY INFO: signal count 35718
RW-shared spins 0, rounds 28579, OS waits 14246
RW-excl spins 0, rounds 2839, OS waits 100
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 28579.00 RW-shared, 2839.00 RW-excl, 0.00 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2026-01-18 13:56:40 0x7f84203c8700 Error in foreign key constraint of table `agenzia consegne`.`Effettuato`:
FOREIGN KEY(NumViaggio) REFERENCES Viaggio(NumViaggio) ON DELETE RESTRICT ON UPDATE CASCADE
):
Cannot find an index in the referenced table where the
referenced columns appear as the first columns, or column types
in the table and the referenced table do not match for constraint.
Note that the internal storage type of ENUM and SET changed in
tables created with >= InnoDB-4.1.12, and such columns in old tables
cannot be referenced by such columns in new tables.
Please refer to https://mariadb.com/kb/en/library/foreign-keys/ for correct foreign key definition.
Create  table `agenzia consegne`.`Effettuato` with foreign key constraint failed. Field type or character set for column 'NumViaggio' does not mach referenced column 'NumViaggio' near 'FOREIGN KEY(NumViaggio) REFERENCES Viaggio(NumViaggio) ON DELETE RESTRICT ON UPDATE CASCADE
)'.
------------
TRANSACTIONS
------------
Trx id counter 86247
Purge done for trx's n:o < 86247 undo n:o < 0 state: running but idle
History list length 22
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421680451887768, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421680451883512, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421680451879256, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421680451875000, 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
891 OS file reads, 183839 OS file writes, 102481 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 5.07 writes/s, 2.91 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 1 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
2.89 hash searches/s, 0.39 non-hash searches/s
---
LOG
---
Log sequence number 41159391
Log flushed up to   41159391
Pages flushed up to 41159391
Last checkpoint at  41159382
0 pending log flushes, 0 pending chkp writes
66534 log i/o's done, 1.96 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 93520
Buffer pool size   16024
Free buffers       15107
Database pages     910
Old database pages 345
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 732, created 178, written 105231
0.00 reads/s, 0.00 creates/s, 2.80 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: 910, 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=903, Main thread ID=140204702689024, state: sleeping
Number of rows inserted 7, updated 23539, deleted 5, read 3471248
0.00 inserts/s, 0.72 updates/s, 0.00 deletes/s, 1.54 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 8007
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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