Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-04-09 18:02:07 0x23d8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5537 srv_active, 0 srv_shutdown, 1562339 srv_idle
srv_master_thread log flush and writes: 1567876
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 190002
--Thread 3684 has waited at srv0srv.cc line 900 for 0.00 seconds the semaphore:
Mutex at 00007FF7153D0C50, Mutex SRV_SYS created srv0srv.cc:1005, lock var 2
OS WAIT ARRAY INFO: signal count 65536
RW-shared spins 4708, rounds 141128, OS waits 3530
RW-excl spins 139, rounds 4268, OS waits 70
RW-sx spins 1, rounds 30, OS waits 0
Spin rounds per wait: 29.98 RW-shared, 30.71 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 21660
Purge done for trx's n:o < 21660 undo n:o < 0 state: running
History list length 50
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283616183251160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283616183246992, 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
17092 OS file reads, 74312 OS file writes, 39804 OS fsyncs
1.38 reads/s, 16384 avg bytes/read, 4.21 writes/s, 2.97 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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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 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
5.28 hash searches/s, 19.36 non-hash searches/s
---
LOG
---
Log sequence number 14296260
Log flushed up to 14296260
Pages flushed up to 14292886
Last checkpoint at 14289431
0 pending log flushes, 0 pending chkp writes
23220 log i/o's done, 1.69 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size 1003
Free buffers 741
Database pages 259
Old database pages 0
Modified db pages 7
Percent of dirty pages(LRU & free pages): 0.699
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 17056, created 631, written 44797
1.38 reads/s, 0.00 creates/s, 2.08 writes/s
Buffer pool hit rate 966 / 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: 259, unzip_LRU len: 0
I/O sum[126]:cur[9], 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=7040, Main thread ID=3472, state: sleeping
Number of rows inserted 1, updated 10717, deleted 0, read 77720
0.00 inserts/s, 0.90 updates/s, 0.00 deletes/s, 5.15 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5787
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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