Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-07-01 13:19:10 0xa88 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 62 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 11032 srv_active, 0 srv_shutdown, 444650 srv_idle
srv_master_thread log flush and writes: 455682
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 368025
OS WAIT ARRAY INFO: signal count 70313
RW-shared spins 0, rounds 84393, OS waits 37598
RW-excl spins 0, rounds 204713, OS waits 3949
RW-sx spins 1275, rounds 18675, OS waits 255
Spin rounds per wait: 84393.00 RW-shared, 204713.00 RW-excl, 14.65 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 3596671
Purge done for trx's n:o < 3596671 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283878517035440, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283878517031224, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283878517027008, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
661853 OS file reads, 240737 OS file writes, 152552 OS fsyncs
0.84 reads/s, 16384 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 23, seg size 25, 2288 merges
merged operations:
 insert 18047, delete mark 1970, delete 1400
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 4 buffer(s)
Hash table size 4441, node heap has 169 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
81.21 hash searches/s, 6.65 non-hash searches/s
---
LOG
---
Log sequence number 766111432
Log flushed up to   766111432
Pages flushed up to 766111432
Last checkpoint at  766111423
0 pending log flushes, 0 pending chkp writes
104490 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 609120
Buffer pool size   1002
Free buffers       0
Database pages     821
Old database pages 283
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 2453583, not young 85905058
0.61 youngs/s, 175.72 non-youngs/s
Pages read 661515, created 1474, written 122172
0.84 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 997 / 1000, young-making rate 2 / 1000 not 602 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 821, unzip_LRU len: 0
I/O sum[52]: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=7236, Main thread ID=10396, state: sleeping
Number of rows inserted 22902, updated 32486, deleted 5162, read 4950665354
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 204.40 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 17586
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================