Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-12-14 01:01:51 0x1500 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 48 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 537 srv_active, 0 srv_shutdown, 298492 srv_idle
srv_master_thread log flush and writes: 299029
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 34812
OS WAIT ARRAY INFO: signal count 5828
RW-shared spins 429, rounds 12687, OS waits 408
RW-excl spins 8, rounds 154, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.57 RW-shared, 19.25 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 26034
Purge done for trx's n:o < 26034 undo n:o < 0 state: running
History list length 12
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283897980391832, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283897980387624, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283897980383416, 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
3639 OS file reads, 11209 OS file writes, 5068 OS fsyncs
1.08 reads/s, 16384 avg bytes/read, 5.75 writes/s, 2.12 fsyncs/s
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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)
4.02 hash searches/s, 65.83 non-hash searches/s
---
LOG
---
Log sequence number 15886009
Log flushed up to 15885989
Pages flushed up to 15884907
Last checkpoint at 15860664
0 pending log flushes, 0 pending chkp writes
3415 log i/o's done, 1.54 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 79616
Buffer pool size 1003
Free buffers 744
Database pages 257
Old database pages 0
Modified db pages 3
Percent of dirty pages(LRU & free pages): 0.299
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 3604, created 223, written 7139
1.08 reads/s, 0.10 creates/s, 4.00 writes/s
Buffer pool hit rate 989 / 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: 257, unzip_LRU len: 0
I/O sum[226]:cur[18], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=5008, Main thread ID=7068, state: sleeping
Number of rows inserted 0, updated 2057, deleted 0, read 7078
0.00 inserts/s, 1.12 updates/s, 0.00 deletes/s, 3.65 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1884
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
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END OF INNODB MONITOR OUTPUT
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