Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-12 19:30:39 0x1708 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 49 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 9 srv_active, 0 srv_shutdown, 15822 srv_idle
srv_master_thread log flush and writes: 15831
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 943
OS WAIT ARRAY INFO: signal count 338
RW-shared spins 457, rounds 9168, OS waits 287
RW-excl spins 455, rounds 1287, OS waits 7
RW-sx spins 3, rounds 2, OS waits 0
Spin rounds per wait: 20.06 RW-shared, 2.83 RW-excl, 0.67 RW-sx
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TRANSACTIONS
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Trx id counter 826
Purge done for trx's n:o < 826 undo n:o < 0 state: running but idle
History list length 34
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283678723211408, 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
822 OS file reads, 1498 OS file writes, 570 OS fsyncs
3.29 reads/s, 16384 avg bytes/read, 10.06 writes/s, 4.78 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 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
3.35 hash searches/s, 75.69 non-hash searches/s
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LOG
---
Log sequence number 1462425
Log flushed up to   1462425
Pages flushed up to 1462425
Last checkpoint at  1462416
0 pending log flushes, 0 pending chkp writes
411 log i/o's done, 3.37 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 95152
Buffer pool size   1003
Free buffers       832
Database pages     169
Old database pages 0
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
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 786, created 390, written 1037
3.29 reads/s, 2.16 creates/s, 6.20 writes/s
Buffer pool hit rate 987 / 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: 169, unzip_LRU len: 0
I/O sum[465]:cur[0], 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=4384, Main thread ID=11504, state: sleeping
Number of rows inserted 1219, updated 0, deleted 0, read 5979
12.51 inserts/s, 0.00 updates/s, 0.00 deletes/s, 6.24 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 572
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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