Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-05 16:01:03 0x424 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 34 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 1934 srv_active, 0 srv_shutdown, 1216217 srv_idle
srv_master_thread log flush and writes: 1218151
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 58827
OS WAIT ARRAY INFO: signal count 19832
RW-shared spins 1067, rounds 31981, OS waits 523
RW-excl spins 33, rounds 981, OS waits 11
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.97 RW-shared, 29.73 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9018
Purge done for trx's n:o < 9016 undo n:o < 0 state: running
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283616183255328, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283616183251160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283616183246992, 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
7654 OS file reads, 26898 OS file writes, 12883 OS fsyncs
3.44 reads/s, 16384 avg bytes/read, 9.94 writes/s, 3.03 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 1 buffer(s)
6.62 hash searches/s, 21.94 non-hash searches/s
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LOG
---
Log sequence number 5968864
Log flushed up to   5968864
Pages flushed up to 5966817
Last checkpoint at  5963675
0 pending log flushes, 0 pending chkp writes
7254 log i/o's done, 1.50 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       740
Database pages     260
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.500
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 7618, created 326, written 17360
3.44 reads/s, 0.03 creates/s, 7.85 writes/s
Buffer pool hit rate 946 / 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: 260, unzip_LRU len: 0
I/O sum[463]:cur[11], 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=7040, Main thread ID=3472, state: sleeping
Number of rows inserted 1, updated 4399, deleted 0, read 34330
0.00 inserts/s, 1.03 updates/s, 0.00 deletes/s, 6.59 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3045
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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