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Storage engines

InnoDB Documentation

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]


=====================================
2025-10-21 05:09:31 0x7f8df01a4700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 35 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 40 srv_active, 0 srv_shutdown, 482 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 87
OS WAIT ARRAY INFO: signal count 87
RW-shared spins 7, rounds 12, OS waits 5
RW-excl spins 4, rounds 120, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.71 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 10048
Purge done for trx's n:o < 10048 undo n:o < 0 state: running but idle
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421722606615144, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421722606614272, 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
1342 OS file reads, 1808 OS file writes, 641 OS fsyncs
0.09 reads/s, 16384 avg bytes/read, 4.20 writes/s, 1.29 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 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 0 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
748.26 hash searches/s, 158.85 non-hash searches/s
---
LOG
---
Log sequence number          51251654
Log buffer assigned up to    51251654
Log buffer completed up to   51251654
Log written up to            51251654
Log flushed up to            51251654
Added dirty pages up to      51251654
Pages flushed up to          51251654
Last checkpoint at           51251654
568 log i/o's done, 1.11 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 727605
Buffer pool size   8192
Free buffers       6760
Database pages     1419
Old database pages 503
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 287, not young 109
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1221, created 201, written 1084
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: 1419, unzip_LRU len: 0
I/O sum[101]: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=365, Main thread ID=140247120680704 , state=sleeping
Number of rows inserted 340, updated 648, deleted 40, read 615786
0.03 inserts/s, 0.00 updates/s, 1.14 deletes/s, 1365.19 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================