Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-12-19 09:44:19 0x7faa88f16700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 51 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 12794 srv_active, 0 srv_shutdown, 21927 srv_idle
srv_master_thread log flush and writes: 34714
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 34926
OS WAIT ARRAY INFO: signal count 30804
RW-shared spins 0, rounds 21365, OS waits 10644
RW-excl spins 0, rounds 3251, OS waits 114
RW-sx spins 5, rounds 123, OS waits 4
Spin rounds per wait: 21365.00 RW-shared, 3251.00 RW-excl, 24.60 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 84100
Purge done for trx's n:o < 84100 undo n:o < 0 state: running but idle
History list length 16
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421845417325048, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421845417320792, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421845417316536, 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
866 OS file reads, 167361 OS file writes, 89390 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 3.57 writes/s, 2.12 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)
1.55 hash searches/s, 0.71 non-hash searches/s
---
LOG
---
Log sequence number 40084088
Log flushed up to   40084088
Pages flushed up to 40084088
Last checkpoint at  40082710
0 pending log flushes, 0 pending chkp writes
57189 log i/o's done, 1.39 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 128256
Buffer pool size   16024
Free buffers       15097
Database pages     861
Old database pages 331
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 707, created 154, written 99025
0.00 reads/s, 0.00 creates/s, 1.94 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: 861, unzip_LRU len: 0
I/O sum[0]:cur[3], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=902, Main thread ID=140369731778304, state: sleeping
Number of rows inserted 2, updated 22787, deleted 1, read 3766171
0.00 inserts/s, 0.43 updates/s, 0.00 deletes/s, 0.94 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 6216
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================