Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-05-03 16:47:50 0x16d8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 1 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 11925 srv_active, 0 srv_shutdown, 380017 srv_idle
srv_master_thread log flush and writes: 391942
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 32379
OS WAIT ARRAY INFO: signal count 16582
RW-shared spins 6899, rounds 196656, OS waits 6499
RW-excl spins 4043, rounds 41002, OS waits 1116
RW-sx spins 27, rounds 558, OS waits 15
Spin rounds per wait: 28.51 RW-shared, 10.14 RW-excl, 20.67 RW-sx
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TRANSACTIONS
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Trx id counter 45381
Purge done for trx's n:o < 45381 undo n:o < 0 state: running
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284305991172384, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284305991164048, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284305991168216, not started flushing log
mysql tables in use 1, locked 1
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: 1; buffer pool: 0
36930 OS file reads, 134732 OS file writes, 77687 OS fsyncs
1.00 reads/s, 16384 avg bytes/read, 58.94 writes/s, 5.00 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, 56 merges
merged operations:
 insert 54, delete mark 2, 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 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)
1.00 hash searches/s, 10.99 non-hash searches/s
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LOG
---
Log sequence number 34876954
Log flushed up to   34875596
Pages flushed up to 34875596
Last checkpoint at  34821598
1 pending log flushes, 0 pending chkp writes
40216 log i/o's done, 2.00 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 260416
Buffer pool size   1003
Free buffers       740
Database pages     257
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 36823, created 1082, written 81595
1.00 reads/s, 0.00 creates/s, 55.94 writes/s
Buffer pool hit rate 961 / 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: 257, unzip_LRU len: 0
I/O sum[140]:cur[57], 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=4396, Main thread ID=5896, state: sleeping
Number of rows inserted 469, updated 15854, deleted 81, read 1994322
0.00 inserts/s, 1.00 updates/s, 0.00 deletes/s, 4.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 88415
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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