Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-07-06 22:50:31 0x7f74440ee700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 40 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 12 srv_active, 0 srv_shutdown, 271 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 37
OS WAIT ARRAY INFO: signal count 37
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9840
Purge done for trx's n:o < 9840 undo n:o < 0 state: running but idle
History list length 87
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421612487658088, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421612487657216, 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
1430 OS file reads, 552 OS file writes, 145 OS fsyncs
0.05 reads/s, 16384 avg bytes/read, 0.40 writes/s, 0.25 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 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 25 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 29 buffer(s)
263.77 hash searches/s, 60.42 non-hash searches/s
---
LOG
---
Log sequence number          50964975
Log buffer assigned up to    50964975
Log buffer completed up to   50964975
Log written up to            50964975
Log flushed up to            50964975
Added dirty pages up to      50964975
Pages flushed up to          50964975
Last checkpoint at           50964975
109 log i/o's done, 0.15 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 598320
Buffer pool size   8192
Free buffers       6675
Database pages     1448
Old database pages 514
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 72, not young 138
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1305, created 231, written 352
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: 1448, unzip_LRU len: 0
I/O sum[10]: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=356, Main thread ID=140137003427584 , state=sleeping
Number of rows inserted 16390, updated 354, deleted 0, read 286351
0.00 inserts/s, 0.07 updates/s, 0.00 deletes/s, 735.21 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================