Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-09-29 01:54:12 0x284 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 65 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 238 srv_active, 0 srv_shutdown, 399335 srv_idle
srv_master_thread log flush and writes: 399573
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 330
OS WAIT ARRAY INFO: signal count 262
RW-shared spins 162, rounds 4530, OS waits 147
RW-excl spins 25, rounds 171, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 27.96 RW-shared, 6.84 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 132372
Purge done for trx's n:o < 132372 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283632237761088, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237756920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237752752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237740248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237736080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237748584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237744416, 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
3891 OS file reads, 5231 OS file writes, 2328 OS fsyncs
9.03 reads/s, 16384 avg bytes/read, 13.20 writes/s, 5.55 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 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 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)
16.46 hash searches/s, 41.81 non-hash searches/s
---
LOG
---
Log sequence number 14176312693
Log flushed up to   14176312673
Pages flushed up to 14176309406
Last checkpoint at  14176279330
0 pending log flushes, 0 pending chkp writes
1553 log i/o's done, 4.03 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 110176
Buffer pool size   1003
Free buffers       732
Database pages     269
Old database pages 0
Modified db pages  35
Percent of dirty pages(LRU & free pages): 3.493
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 3843, created 176, written 3360
8.40 reads/s, 0.30 creates/s, 16.60 writes/s
Buffer pool hit rate 974 / 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: 269, unzip_LRU len: 0
I/O sum[860]:cur[20], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=3788, Main thread ID=5232, state: sleeping
Number of rows inserted 0, updated 1067, deleted 0, read 143926
0.00 inserts/s, 3.28 updates/s, 0.00 deletes/s, 16.63 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2109
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.88 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================