Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-06-02 21:42:41 0x7fc16a9b46c0 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 9 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 10129 srv_active, 0 srv_shutdown, 5549396 srv_idle
srv_master_thread log flush and writes: 5558902
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 19094
OS WAIT ARRAY INFO: signal count 15578
RW-shared spins 2547, rounds 76404, OS waits 2529
RW-excl spins 16, rounds 467, OS waits 10
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 RW-shared, 29.19 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 55015
Purge done for trx's n:o < 55015 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421943413043464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421943413039248, 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
16872 OS file reads, 134153 OS file writes, 70552 OS fsyncs
2.00 reads/s, 16384 avg bytes/read, 3.00 writes/s, 2.89 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 0 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)
7.78 hash searches/s, 31.89 non-hash searches/s
---
LOG
---
Log sequence number 23477310
Log flushed up to   23477290
Pages flushed up to 23457765
Last checkpoint at  23455679
0 pending log flushes, 0 pending chkp writes
35491 log i/o's done, 2.33 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1003
Free buffers       741
Database pages     260
Old database pages 0
Modified db pages  52
Percent of dirty pages(LRU & free pages): 5.190
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 16838, created 759, written 86229
2.00 reads/s, 0.11 creates/s, 0.44 writes/s
Buffer pool hit rate 981 / 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: 260, unzip_LRU len: 0
I/O sum[190]:cur[6], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=287, Main thread ID=140468163696320, state: sleeping
Number of rows inserted 56, updated 20180, deleted 0, read 400632
0.00 inserts/s, 2.11 updates/s, 0.00 deletes/s, 7.67 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 20793
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================