Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-19 07:10:09 0x50ac INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 15596 srv_active, 0 srv_shutdown, 357352 srv_idle
srv_master_thread log flush and writes: 372948
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 51436
OS WAIT ARRAY INFO: signal count 96668
RW-shared spins 219728, rounds 2191035, OS waits 33572
RW-excl spins 112283, rounds 719695, OS waits 6820
RW-sx spins 10367, rounds 31005, OS waits 274
Spin rounds per wait: 9.97 RW-shared, 6.41 RW-excl, 2.99 RW-sx
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TRANSACTIONS
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Trx id counter 13321497
Purge done for trx's n:o < 13321497 undo n:o < 0 state: running but idle
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283914276315496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283914276302992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283914276319664, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283914276307160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283914276311328, 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
3794317 OS file reads, 259063 OS file writes, 133761 OS fsyncs
20.41 reads/s, 16384 avg bytes/read, 25.33 writes/s, 13.85 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 387, seg size 389, 4838 merges
merged operations:
 insert 23873, delete mark 278285, delete 607
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)
39.31 hash searches/s, 98.51 non-hash searches/s
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LOG
---
Log sequence number 1072766516254
Log flushed up to   1072766516218
Pages flushed up to 1072766462434
Last checkpoint at  1072766432928
0 pending log flushes, 0 pending chkp writes
80709 log i/o's done, 9.03 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 3260208
Buffer pool size   1003
Free buffers       736
Database pages     259
Old database pages 0
Modified db pages  93
Percent of dirty pages(LRU & free pages): 9.337
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 26860, not young 134143845
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3793001, created 3015, written 158066
20.41 reads/s, 0.38 creates/s, 14.05 writes/s
Buffer pool hit rate 950 / 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: 259, unzip_LRU len: 0
I/O sum[2116]:cur[13], 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=4832, Main thread ID=7096, state: sleeping
Number of rows inserted 143359, updated 34285, deleted 138727, read 147512037
0.03 inserts/s, 7.31 updates/s, 0.03 deletes/s, 91.64 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 0
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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