Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-15 00:49:28 0xe230 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 63 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 1099 srv_active, 0 srv_shutdown, 294640 srv_idle
srv_master_thread log flush and writes: 295739
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 21003
OS WAIT ARRAY INFO: signal count 7607
RW-shared spins 1397, rounds 38870, OS waits 1152
RW-excl spins 446, rounds 12134, OS waits 340
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 27.82 RW-shared, 27.21 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 302674
Purge done for trx's n:o < 302674 undo n:o < 0 state: running
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283648882938000, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283648882942168, 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
39166 OS file reads, 12793 OS file writes, 6799 OS fsyncs
0.76 reads/s, 16384 avg bytes/read, 0.35 writes/s, 0.17 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, 590 merges
merged operations:
 insert 590, 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)
4.90 hash searches/s, 6.94 non-hash searches/s
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LOG
---
Log sequence number 119711327
Log flushed up to   119711327
Pages flushed up to 119711327
Last checkpoint at  119711318
0 pending log flushes, 0 pending chkp writes
4022 log i/o's done, 0.11 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 242888
Buffer pool size   1003
Free buffers       731
Database pages     264
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 4889, not young 45950
0.00 youngs/s, 0.00 non-youngs/s
Pages read 39066, created 161, written 7883
0.76 reads/s, 0.00 creates/s, 0.22 writes/s
Buffer pool hit rate 968 / 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: 264, unzip_LRU len: 0
I/O sum[62]: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=25572, Main thread ID=26436, state: sleeping
Number of rows inserted 753, updated 3, deleted 1, read 7511764
0.03 inserts/s, 0.00 updates/s, 0.00 deletes/s, 8.84 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 57546
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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