Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-04-19 15:30:19 0x7727029ff6c0 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 51 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 767 srv_active, 0 srv_shutdown, 30020130 srv_idle
srv_master_thread log flush and writes: 30019239
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 16204
OS WAIT ARRAY INFO: signal count 8137
RW-shared spins 570, rounds 16987, OS waits 562
RW-excl spins 2, rounds 120, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.80 RW-shared, 60.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 8275
Purge done for trx's n:o < 8275 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 412484135559432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 412484135555216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
2112 OS file reads, 11609 OS file writes, 6163 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
0.29 hash searches/s, 0.41 non-hash searches/s
---
LOG
---
Log sequence number 4342823
Log flushed up to   4342823
Pages flushed up to 4342823
Last checkpoint at  4342814
0 pending log flushes, 0 pending chkp writes
3650 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1003
Free buffers       743
Database pages     257
Old database pages 0
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 2077, created 186, written 7050
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: 257, 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=293, Main thread ID=131008739411648, state: sleeping
Number of rows inserted 1, updated 1770, deleted 0, read 17461
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.29 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4016
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================