Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-14 21:29:22 0x37cc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 47 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 302 srv_active, 0 srv_shutdown, 640789 srv_idle
srv_master_thread log flush and writes: 641091
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1489
OS WAIT ARRAY INFO: signal count 1065
RW-shared spins 523, rounds 15451, OS waits 514
RW-excl spins 11, rounds 72, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.54 RW-shared, 6.55 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 322290
Purge done for trx's n:o < 322290 undo n:o < 0 state: running
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284106545209632, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284106545205464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284106545201296, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
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
2805 OS file reads, 5359 OS file writes, 3043 OS fsyncs
2.21 reads/s, 16384 avg bytes/read, 5.00 writes/s, 2.09 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 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)
5.66 hash searches/s, 17.51 non-hash searches/s
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LOG
---
Log sequence number 1336336
Log flushed up to   1336300
Pages flushed up to 1335152
Last checkpoint at  1333919
0 pending log flushes, 0 pending chkp writes
2064 log i/o's done, 1.49 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 553648128
Dictionary memory allocated 994088
Buffer pool size   1003
Free buffers       740
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2057, created 159, written 2953
2.35 reads/s, 0.06 creates/s, 4.77 writes/s
Buffer pool hit rate 978 / 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: 257, unzip_LRU len: 0
I/O sum[254]:cur[5], 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=16728, Main thread ID=6864, state: sleeping
Number of rows inserted 8, updated 706, deleted 0, read 143600
0.00 inserts/s, 1.02 updates/s, 0.00 deletes/s, 5.66 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 845
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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