Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-19 03:08:56 0x3d58 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 26 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 7878 srv_active, 0 srv_shutdown, 67535 srv_idle
srv_master_thread log flush and writes: 75413
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 581494
OS WAIT ARRAY INFO: signal count 343179
RW-shared spins 429228, rounds 2363150, OS waits 43290
RW-excl spins 1000257, rounds 3933255, OS waits 22588
RW-sx spins 88136, rounds 780657, OS waits 10706
Spin rounds per wait: 5.51 RW-shared, 3.93 RW-excl, 8.86 RW-sx
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TRANSACTIONS
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Trx id counter 64009940
Purge done for trx's n:o < 64009940 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284022166655192, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284022166651024, 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
1461346 OS file reads, 443780 OS file writes, 160934 OS fsyncs
46.96 reads/s, 16384 avg bytes/read, 11.27 writes/s, 6.96 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 390, seg size 392, 1658 merges
merged operations:
 insert 2337, delete mark 870, delete 359
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)
21.69 hash searches/s, 93.30 non-hash searches/s
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LOG
---
Log sequence number 11866885058
Log flushed up to   11866885038
Pages flushed up to 11866832723
Last checkpoint at  11866827494
0 pending log flushes, 0 pending chkp writes
103467 log i/o's done, 4.65 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 786256
Buffer pool size   1003
Free buffers       727
Database pages     268
Old database pages 0
Modified db pages  82
Percent of dirty pages(LRU & free pages): 8.233
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 59788, not young 23636754
0.35 youngs/s, 288.07 non-youngs/s
Pages read 1461030, created 22686, written 319149
46.96 reads/s, 0.04 creates/s, 5.50 writes/s
Buffer pool hit rate 939 / 1000, young-making rate 0 / 1000 not 372 / 1000
Pages read ahead 3.69/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 268, unzip_LRU len: 0
I/O sum[1342]:cur[21], 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=4228, Main thread ID=5456, state: sleeping
Number of rows inserted 16927, updated 3354447, deleted 1208, read 299632447
0.00 inserts/s, 3.46 updates/s, 0.00 deletes/s, 4175.95 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 20333
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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