Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-05 22:21:11 0x246c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 17 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 2630 srv_active, 0 srv_shutdown, 5265 srv_idle
srv_master_thread log flush and writes: 7895
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 43356
OS WAIT ARRAY INFO: signal count 5181
RW-shared spins 1653, rounds 44795, OS waits 1439
RW-excl spins 694, rounds 5966, OS waits 126
RW-sx spins 3, rounds 90, OS waits 3
Spin rounds per wait: 27.10 RW-shared, 8.60 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 6650
Purge done for trx's n:o < 6650 undo n:o < 0 state: running
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283071172673824, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172669656, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172665488, 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
6192 OS file reads, 26386 OS file writes, 16307 OS fsyncs
0.71 reads/s, 16384 avg bytes/read, 4.53 writes/s, 3.76 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 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)
3.12 hash searches/s, 8.23 non-hash searches/s
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LOG
---
Log sequence number 4447153
Log flushed up to   4447153
Pages flushed up to 4447153
Last checkpoint at  4444556
0 pending log flushes, 0 pending chkp writes
8198 log i/o's done, 1.82 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 120192
Buffer pool size   1003
Free buffers       741
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 6156, created 383, written 15417
0.71 reads/s, 0.00 creates/s, 2.06 writes/s
Buffer pool hit rate 968 / 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=2216, Main thread ID=5740, state: sleeping
Number of rows inserted 105, updated 3021, deleted 4, read 25662
0.00 inserts/s, 0.71 updates/s, 0.00 deletes/s, 3.18 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5112
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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