Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-12 00:18:04 0x2e50 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 50 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 399 srv_active, 0 srv_shutdown, 21907 srv_idle
srv_master_thread log flush and writes: 22306
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 30049
OS WAIT ARRAY INFO: signal count 818
RW-shared spins 409, rounds 12021, OS waits 364
RW-excl spins 85, rounds 2841, OS waits 79
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.39 RW-shared, 33.42 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 22990
Purge done for trx's n:o < 22990 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283834829734248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283834829730080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283834829725912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283834829721744, 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
3664 OS file reads, 6384 OS file writes, 3180 OS fsyncs
0.20 reads/s, 16384 avg bytes/read, 0.76 writes/s, 0.48 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, 19 merges
merged operations:
 insert 19, 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 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
0.56 hash searches/s, 19.18 non-hash searches/s
---
LOG
---
Log sequence number 24697548
Log flushed up to   24697548
Pages flushed up to 24697548
Last checkpoint at  24696297
0 pending log flushes, 0 pending chkp writes
1978 log i/o's done, 0.24 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 230368
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 13, not young 212
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3569, created 180, written 3942
0.20 reads/s, 0.02 creates/s, 0.44 writes/s
Buffer pool hit rate 991 / 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[32]: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=6984, Main thread ID=8840, state: sleeping
Number of rows inserted 9, updated 993, deleted 0, read 261677
0.00 inserts/s, 0.08 updates/s, 0.00 deletes/s, 0.48 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1650
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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