Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-31 14:39:05 0x2d84 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 62 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 7151 srv_active, 0 srv_shutdown, 13639 srv_idle
srv_master_thread log flush and writes: 20790
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 58080
OS WAIT ARRAY INFO: signal count 8477
RW-shared spins 3247, rounds 96423, OS waits 3199
RW-excl spins 182, rounds 4479, OS waits 146
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.70 RW-shared, 24.61 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 339969
Purge done for trx's n:o < 339969 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284207983522080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284207983517912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284207983513744, 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
40138 OS file reads, 77773 OS file writes, 46378 OS fsyncs
1.21 reads/s, 16384 avg bytes/read, 3.82 writes/s, 2.40 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, 62 merges
merged operations:
 insert 62, 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)
28.77 hash searches/s, 36.85 non-hash searches/s
---
LOG
---
Log sequence number 202005680
Log flushed up to   202005680
Pages flushed up to 202005680
Last checkpoint at  201996732
0 pending log flushes, 0 pending chkp writes
24619 log i/o's done, 1.34 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 913960
Buffer pool size   1003
Free buffers       739
Database pages     256
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 273, not young 10836
0.00 youngs/s, 0.00 non-youngs/s
Pages read 39770, created 669, written 44994
1.21 reads/s, 0.02 creates/s, 2.08 writes/s
Buffer pool hit rate 990 / 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: 256, unzip_LRU len: 0
I/O sum[195]: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=3896, Main thread ID=6500, state: sleeping
Number of rows inserted 193, updated 10338, deleted 6, read 2622328
0.00 inserts/s, 0.47 updates/s, 0.00 deletes/s, 28.32 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 49778
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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