Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-14 21:48:15 0x570 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 12 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 9040 srv_active, 0 srv_shutdown, 8072 srv_idle
srv_master_thread log flush and writes: 17112
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 20411
OS WAIT ARRAY INFO: signal count 11931
RW-shared spins 10460, rounds 190249, OS waits 4484
RW-excl spins 8800, rounds 17893, OS waits 151
RW-sx spins 208, rounds 1623, OS waits 28
Spin rounds per wait: 18.19 RW-shared, 2.03 RW-excl, 7.80 RW-sx
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TRANSACTIONS
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Trx id counter 43499
Purge done for trx's n:o < 43499 undo n:o < 0 state: running
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283359865459264, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865455096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865450928, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865446760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865442592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865438424, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865434256, 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
91757 OS file reads, 122013 OS file writes, 62503 OS fsyncs
0.33 reads/s, 16384 avg bytes/read, 3.08 writes/s, 1.67 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 138 merges
merged operations:
 insert 859, 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)
3.33 hash searches/s, 7.00 non-hash searches/s
---
LOG
---
Log sequence number 169362008
Log flushed up to   169361988
Pages flushed up to 169355131
Last checkpoint at  169355078
0 pending log flushes, 0 pending chkp writes
31790 log i/o's done, 1.08 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 212840
Buffer pool size   1003
Free buffers       738
Database pages     257
Old database pages 0
Modified db pages  17
Percent of dirty pages(LRU & free pages): 1.707
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1556, not young 403768
0.00 youngs/s, 0.00 non-youngs/s
Pages read 91542, created 7590, written 79191
0.33 reads/s, 0.00 creates/s, 1.75 writes/s
Buffer pool hit rate 988 / 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[233]:cur[1], 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=3720, Main thread ID=13284, state: sleeping
Number of rows inserted 126513, updated 13574, deleted 0, read 2879821
0.00 inserts/s, 0.42 updates/s, 0.00 deletes/s, 3.17 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 33574
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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