Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-07-30 05:23:41 0x1188 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 45 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 0 srv_active, 0 srv_shutdown, 420030 srv_idle
srv_master_thread log flush and writes: 420030
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 29208
OS WAIT ARRAY INFO: signal count 23146
RW-shared spins 11318, rounds 334665, OS waits 11098
RW-excl spins 231, rounds 5496, OS waits 159
RW-sx spins 6, rounds 180, OS waits 6
Spin rounds per wait: 29.57 RW-shared, 23.79 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 31193
Purge done for trx's n:o < 31193 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283553554534832, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283553554530616, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283553554526400, 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
332 OS file reads, 129875 OS file writes, 79073 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 2.00 writes/s, 1.18 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
0.51 hash searches/s, 2.27 non-hash searches/s
---
LOG
---
Log sequence number 17190022
Log flushed up to 17190022
Pages flushed up to 17190022
Last checkpoint at 17186883
0 pending log flushes, 0 pending chkp writes
47344 log i/o's done, 0.71 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 82432
Buffer pool size 1003
Free buffers 498
Database pages 502
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 296, created 206, written 72588
0.00 reads/s, 0.00 creates/s, 1.13 writes/s
Buffer pool hit rate 1000 / 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: 502, unzip_LRU len: 0
I/O sum[0]:cur[31], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=1112, Main thread ID=2780, state: sleeping
Number of rows inserted 55, updated 15184, deleted 0, read 256977
0.00 inserts/s, 0.20 updates/s, 0.00 deletes/s, 0.51 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 12556
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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