Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-16 07:37:02 0x3111cc000 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 11 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 5326 srv_active, 0 srv_shutdown, 24620 srv_idle
srv_master_thread log flush and writes: 29946
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 41259
OS WAIT ARRAY INFO: signal count 16655
RW-shared spins 2021, rounds 60482, OS waits 1906
RW-excl spins 134, rounds 2441, OS waits 22
RW-sx spins 2, rounds 2, OS waits 0
Spin rounds per wait: 29.93 RW-shared, 18.22 RW-excl, 1.00 RW-sx
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TRANSACTIONS
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Trx id counter 66794
Purge done for trx's n:o < 66794 undo n:o < 0 state: running but idle
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421965236216008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236211816, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
13221 OS file reads, 53689 OS file writes, 32987 OS fsyncs
6.36 reads/s, 16384 avg bytes/read, 18.36 writes/s, 8.27 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 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)
31.82 hash searches/s, 57.63 non-hash searches/s
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LOG
---
Log sequence number 41839269
Log flushed up to   41839249
Pages flushed up to 41838150
Last checkpoint at  41780694
0 pending log flushes, 0 pending chkp writes
16790 log i/o's done, 5.73 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 189728
Buffer pool size   1002
Free buffers       751
Database pages     246
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.301
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 13141, created 391, written 30787
6.36 reads/s, 0.27 creates/s, 11.45 writes/s
Buffer pool hit rate 973 / 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: 246, unzip_LRU len: 0
I/O sum[343]:cur[93], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=49381, Main thread ID=13166444544, state: sleeping
Number of rows inserted 100, updated 7348, deleted 28, read 142843
0.00 inserts/s, 4.45 updates/s, 0.00 deletes/s, 52.81 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 37113
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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