Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-05-03 08:39:48 0x38f8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 2 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 2572 srv_active, 0 srv_shutdown, 1446987 srv_idle
srv_master_thread log flush and writes: 1449559
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 88861
OS WAIT ARRAY INFO: signal count 12816
RW-shared spins 3246, rounds 81683, OS waits 2348
RW-excl spins 924, rounds 8540, OS waits 139
RW-sx spins 94, rounds 1920, OS waits 29
Spin rounds per wait: 25.16 RW-shared, 9.24 RW-excl, 20.43 RW-sx
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TRANSACTIONS
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Trx id counter 93741
Purge done for trx's n:o < 93741 undo n:o < 0 state: running
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283848427942104, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283848427937936, 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
60499 OS file reads, 49150 OS file writes, 24066 OS fsyncs
48.48 reads/s, 16384 avg bytes/read, 10.49 writes/s, 9.50 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 20, seg size 22, 305 merges
merged operations:
 insert 22, delete mark 2478, delete 404
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)
40.98 hash searches/s, 53.97 non-hash searches/s
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LOG
---
Log sequence number 1120644652
Log flushed up to   1120644632
Pages flushed up to 1120639666
Last checkpoint at  1120637991
0 pending log flushes, 0 pending chkp writes
15192 log i/o's done, 5.00 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 671072
Buffer pool size   1003
Free buffers       739
Database pages     256
Old database pages 0
Modified db pages  18
Percent of dirty pages(LRU & free pages): 1.807
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1256, not young 195606
0.00 youngs/s, 0.00 non-youngs/s
Pages read 60227, created 856, written 30392
48.48 reads/s, 0.50 creates/s, 3.50 writes/s
Buffer pool hit rate 975 / 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[648]:cur[13], 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=8120, Main thread ID=7176, state: sleeping
Number of rows inserted 632, updated 6637, deleted 4562, read 3875821
0.00 inserts/s, 2.50 updates/s, 0.00 deletes/s, 15044.98 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 34621
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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