Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-03 22:37:42 0x2270 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 34 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 24325 srv_active, 0 srv_shutdown, 2317081 srv_idle
srv_master_thread log flush and writes: 2341406
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 530216
OS WAIT ARRAY INFO: signal count 51166
RW-shared spins 28169, rounds 847996, OS waits 25918
RW-excl spins 4173, rounds 16024, OS waits 168
RW-sx spins 13, rounds 390, OS waits 11
Spin rounds per wait: 30.10 RW-shared, 3.84 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 65217
Purge done for trx's n:o < 65217 undo n:o < 0 state: running
History list length 33
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284205960147160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284205960142992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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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
86070 OS file reads, 289977 OS file writes, 189446 OS fsyncs
1.06 reads/s, 16384 avg bytes/read, 3.91 writes/s, 2.41 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 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)
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)
7.56 hash searches/s, 18.09 non-hash searches/s
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LOG
---
Log sequence number 71750843
Log flushed up to   71750823
Pages flushed up to 71748632
Last checkpoint at  71739940
0 pending log flushes, 0 pending chkp writes
108924 log i/o's done, 1.44 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 230368
Buffer pool size   1003
Free buffers       737
Database pages     258
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.502
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 102, not young 45843
0.00 youngs/s, 0.00 non-youngs/s
Pages read 86034, created 4468, written 153569
1.06 reads/s, 0.03 creates/s, 2.15 writes/s
Buffer pool hit rate 977 / 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: 258, unzip_LRU len: 0
I/O sum[170]:cur[9], 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=1220, Main thread ID=172, state: sleeping
Number of rows inserted 121773, updated 29327, deleted 50, read 8478089
0.00 inserts/s, 0.94 updates/s, 0.00 deletes/s, 11.82 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 56860
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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