Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-09-17 04:07:53 0x7f77e80b2700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 61 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 12 srv_active, 0 srv_shutdown, 414 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 44
OS WAIT ARRAY INFO: signal count 41
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 9841
Purge done for trx's n:o < 9838 undo n:o < 0 state: running but idle
History list length 85
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421627991109072, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421627991108200, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421627991107328, 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
1264 OS file reads, 465 OS file writes, 182 OS fsyncs
0.03 reads/s, 16384 avg bytes/read, 0.30 writes/s, 0.16 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 0 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 0 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 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
493.06 hash searches/s, 305.91 non-hash searches/s
---
LOG
---
Log sequence number          50967096
Log buffer assigned up to    50967096
Log buffer completed up to   50967096
Log written up to            50967096
Log flushed up to            50967096
Added dirty pages up to      50967096
Pages flushed up to          50967096
Last checkpoint at           50967096
128 log i/o's done, 0.12 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 601420
Buffer pool size   8192
Free buffers       6891
Database pages     1286
Old database pages 494
Modified db pages  0
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 1143, created 143, written 278
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: 1286, 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=370, Main thread ID=140152505575168 , state=sleeping
Number of rows inserted 15, updated 352, deleted 0, read 189391
0.00 inserts/s, 0.05 updates/s, 0.00 deletes/s, 692.32 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================