Storage engines

InnoDB

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

[ Biến | Bể bộ đệm | Trạng thái InnoDB ]

=====================================
2026-10-31 16:38:48 0x4154 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 9 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 2322 srv_active, 0 srv_shutdown, 17513 srv_idle
srv_master_thread log flush and writes: 19835
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3316
OS WAIT ARRAY INFO: signal count 3026
RW-shared spins 1890, rounds 56582, OS waits 1885
RW-excl spins 20, rounds 575, OS waits 19
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.94 RW-shared, 28.75 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9615
Purge done for trx's n:o < 9615 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284242159280416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284242159276248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284242159272080, 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
7413 OS file reads, 29127 OS file writes, 18194 OS fsyncs
22.55 reads/s, 16384 avg bytes/read, 5.89 writes/s, 4.44 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 1 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 1 buffer(s)
21.55 hash searches/s, 75.10 non-hash searches/s
---
LOG
---
Log sequence number 9805064
Log flushed up to   9805044
Pages flushed up to 9784147
Last checkpoint at  9776102
0 pending log flushes, 0 pending chkp writes
10379 log i/o's done, 3.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 140224
Buffer pool size   1003
Free buffers       734
Database pages     265
Old database pages 0
Modified db pages  38
Percent of dirty pages(LRU & free pages): 3.800
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 7354, created 248, written 15780
22.55 reads/s, 0.22 creates/s, 2.22 writes/s
Buffer pool hit rate 960 / 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: 265, unzip_LRU len: 0
I/O sum[867]:cur[16], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=4364, Main thread ID=6124, state: sleeping
Number of rows inserted 0, updated 3765, deleted 0, read 249185
0.00 inserts/s, 2.56 updates/s, 0.00 deletes/s, 900.34 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4585
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================