Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-05-07 21:17:45 0xdda0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 1 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5051 srv_active, 0 srv_shutdown, 802474 srv_idle
srv_master_thread log flush and writes: 807525
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 206088
OS WAIT ARRAY INFO: signal count 46958
RW-shared spins 8331, rounds 218427, OS waits 7032
RW-excl spins 12700, rounds 39061, OS waits 157
RW-sx spins 39, rounds 368, OS waits 8
Spin rounds per wait: 26.22 RW-shared, 3.08 RW-excl, 9.44 RW-sx
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TRANSACTIONS
------------
Trx id counter 1504523
Purge done for trx's n:o < 1504523 undo n:o < 0 state: running
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282837835948320, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282837835944152, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282837835939984, 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
119755 OS file reads, 88877 OS file writes, 46137 OS fsyncs
17.98 reads/s, 16384 avg bytes/read, 23.98 writes/s, 10.99 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 3, seg size 5, 1 merges
merged operations:
insert 0, delete mark 1, 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 0 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)
46.95 hash searches/s, 106.89 non-hash searches/s
---
LOG
---
Log sequence number 22661219
Log flushed up to 22661219
Pages flushed up to 22661219
Last checkpoint at 22652430
0 pending log flushes, 0 pending chkp writes
28882 log i/o's done, 8.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 4647424
Buffer pool size 1003
Free buffers 740
Database pages 256
Old database pages 0
Modified db pages 0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 2667, not young 929822
0.00 youngs/s, 0.00 non-youngs/s
Pages read 117923, created 1337, written 53633
17.98 reads/s, 0.00 creates/s, 14.99 writes/s
Buffer pool hit rate 953 / 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: 256, unzip_LRU len: 0
I/O sum[78]:cur[16], 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=21304, Main thread ID=21480, state: sleeping
Number of rows inserted 12227, updated 11112, deleted 218, read 351052705
0.00 inserts/s, 6.99 updates/s, 0.00 deletes/s, 663.34 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 45404
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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