Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
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2026-10-23 20:22:53 0x2078 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 51 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 8524 srv_active, 0 srv_shutdown, 104900 srv_idle
srv_master_thread log flush and writes: 113424
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 129770
OS WAIT ARRAY INFO: signal count 11364
RW-shared spins 2475, rounds 74025, OS waits 2359
RW-excl spins 123, rounds 1452, OS waits 36
RW-sx spins 5, rounds 180, OS waits 5
Spin rounds per wait: 29.91 RW-shared, 11.80 RW-excl, 36.00 RW-sx
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TRANSACTIONS
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Trx id counter 135964
Purge done for trx's n:o < 135964 undo n:o < 0 state: running but idle
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283374649245912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283374649241744, 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
22203 OS file reads, 87615 OS file writes, 51199 OS fsyncs
1.69 reads/s, 16384 avg bytes/read, 5.08 writes/s, 3.20 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, 2 merges
merged operations:
insert 6, 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 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)
7.31 hash searches/s, 20.96 non-hash searches/s
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LOG
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Log sequence number 50217073
Log flushed up to 50217053
Pages flushed up to 50203893
Last checkpoint at 50201783
0 pending log flushes, 0 pending chkp writes
25133 log i/o's done, 1.96 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 155248
Buffer pool size 1003
Free buffers 740
Database pages 258
Old database pages 0
Modified db pages 42
Percent of dirty pages(LRU & free pages): 4.204
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 22138, created 571, written 53311
1.69 reads/s, 0.02 creates/s, 2.61 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[218]:cur[2], 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=3672, Main thread ID=5372, state: sleeping
Number of rows inserted 116, updated 11677, deleted 27, read 15696635
0.00 inserts/s, 1.00 updates/s, 0.00 deletes/s, 75.04 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 26852
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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