Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-21 16:15:10 0x2e0c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 8389 srv_active, 0 srv_shutdown, 63767 srv_idle
srv_master_thread log flush and writes: 72142
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 3069796
OS WAIT ARRAY INFO: signal count 3451419
RW-shared spins 7267161, rounds 114126976, OS waits 3058328
RW-excl spins 622338, rounds 685707, OS waits 416
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 15.70 RW-shared, 1.10 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 98374
Purge done for trx's n:o < 98374 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282970780180696, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780176528, 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
56000078 OS file reads, 119074 OS file writes, 72609 OS fsyncs
1361.94 reads/s, 16384 avg bytes/read, 6.26 writes/s, 2.77 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, 614 merges
merged operations:
 insert 614, delete mark 3, 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 5 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 9 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
18268.61 hash searches/s, 8914.46 non-hash searches/s
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LOG
---
Log sequence number 80557281
Log flushed up to   80557261
Pages flushed up to 80552224
Last checkpoint at  80528060
0 pending log flushes, 0 pending chkp writes
35911 log i/o's done, 1.74 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 97656
Buffer pool size   1003
Free buffers       724
Database pages     261
Old database pages 0
Modified db pages  12
Percent of dirty pages(LRU & free pages): 1.217
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 8271379, not young 2208087229
111.30 youngs/s, 33138.61 non-youngs/s
Pages read 56000033, created 784, written 69213
1361.94 reads/s, 0.00 creates/s, 4.13 writes/s
Buffer pool hit rate 984 / 1000, young-making rate 1 / 1000 not 388 / 1000
Pages read ahead 269.99/s, evicted without access 14.23/s, Random read ahead 0.00/s
LRU len: 261, unzip_LRU len: 0
I/O sum[52764]: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=4240, Main thread ID=5824, state: sleeping
Number of rows inserted 2592, updated 10161, deleted 3, read 1382686921
0.03 inserts/s, 1.08 updates/s, 0.00 deletes/s, 41087.82 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 12730
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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