Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-25 20:23:54 0x714 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 8 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 7809 srv_active, 0 srv_shutdown, 37279 srv_idle
srv_master_thread log flush and writes: 45088
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 252025
OS WAIT ARRAY INFO: signal count 226060
RW-shared spins 572573, rounds 10425688, OS waits 242747
RW-excl spins 59861, rounds 739976, OS waits 4460
RW-sx spins 4, rounds 101, OS waits 3
Spin rounds per wait: 18.21 RW-shared, 12.36 RW-excl, 25.25 RW-sx
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TRANSACTIONS
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Trx id counter 7759564
Purge done for trx's n:o < 7759564 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284268549124312, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284268549120144, 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
2534567 OS file reads, 105932 OS file writes, 57688 OS fsyncs
127.98 reads/s, 16384 avg bytes/read, 17.50 writes/s, 9.50 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 15, seg size 17, 1849 merges
merged operations:
 insert 1971, delete mark 12, delete 2
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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
22.00 hash searches/s, 49.24 non-hash searches/s
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LOG
---
Log sequence number 4686415098
Log flushed up to   4686415078
Pages flushed up to 4686413853
Last checkpoint at  4686413752
0 pending log flushes, 0 pending chkp writes
29634 log i/o's done, 4.00 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 618488
Buffer pool size   1003
Free buffers       739
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 287325, not young 81605535
38.87 youngs/s, 230.22 non-youngs/s
Pages read 2534318, created 873, written 66306
127.98 reads/s, 0.12 creates/s, 11.50 writes/s
Buffer pool hit rate 919 / 1000, young-making rate 24 / 1000 not 145 / 1000
Pages read ahead 42.24/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 257, unzip_LRU len: 0
I/O sum[2713]:cur[3], 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=4336, Main thread ID=6540, state: sleeping
Number of rows inserted 740, updated 18371, deleted 147, read 362490645
0.00 inserts/s, 2.50 updates/s, 0.00 deletes/s, 10439.82 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 76467
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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