Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-04-30 01:07:55 0x5b9c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 11 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 14256 srv_active, 0 srv_shutdown, 884234 srv_idle
srv_master_thread log flush and writes: 898490
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 66072
OS WAIT ARRAY INFO: signal count 128134
RW-shared spins 906599, rounds 9351668, OS waits 52288
RW-excl spins 162649, rounds 489718, OS waits 3730
RW-sx spins 166, rounds 2103, OS waits 49
Spin rounds per wait: 10.32 RW-shared, 3.01 RW-excl, 12.67 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 179241
Purge done for trx's n:o < 179232 undo n:o < 0 state: running
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283521888206992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283521888211160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283521888219496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283521888215328, not started
0 lock struct(s), heap size 1128, 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
3276536 OS file reads, 169193 OS file writes, 100687 OS fsyncs
1 pending reads, 0 pending writes
11.36 reads/s, 16384 avg bytes/read, 2.09 writes/s, 1.36 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 86 merges
merged operations:
 insert 2364, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
4.36 hash searches/s, 12.82 non-hash searches/s
---
LOG
---
Log sequence number 3593718750
Log flushed up to   3593718618
Pages flushed up to 3593717507
Last checkpoint at  3593717507
0 pending log flushes, 0 pending chkp writes
52773 log i/o's done, 0.82 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 162760
Buffer pool size   1003
Free buffers       721
Database pages     274
Old database pages 0
Modified db pages  13
Percent of dirty pages(LRU & free pages): 1.305
Max dirty pages percent: 75.000
Pending reads 1
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 389847, not young 161383410
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3276485, created 8330, written 99687
11.27 reads/s, 0.00 creates/s, 1.09 writes/s
Buffer pool hit rate 708 / 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: 274, unzip_LRU len: 0
I/O sum[436]: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=5200, Main thread ID=856, state: sleeping
Number of rows inserted 1021487, updated 14398, deleted 1710, read 416992595
0.00 inserts/s, 0.55 updates/s, 0.00 deletes/s, 6.45 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 0
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================