Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-09 16:04:12 0x101c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 35 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 5313 srv_active, 0 srv_shutdown, 1555566 srv_idle
srv_master_thread log flush and writes: 1560879
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 181624
--Thread 3684 has waited at srv0srv.cc line 900 for 0.00 seconds the semaphore:
Mutex at 00007FF7153D0C50, Mutex SRV_SYS created srv0srv.cc:1005, lock var 2

OS WAIT ARRAY INFO: signal count 62685
RW-shared spins 4562, rounds 136761, OS waits 3431
RW-excl spins 132, rounds 4028, OS waits 64
RW-sx spins 1, rounds 30, OS waits 0
Spin rounds per wait: 29.98 RW-shared, 30.52 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 20730
Purge done for trx's n:o < 20729 undo n:o < 0 state: running
History list length 12
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283616183251160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283616183246992, 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
16353 OS file reads, 71191 OS file writes, 38283 OS fsyncs
1.89 reads/s, 16384 avg bytes/read, 5.91 writes/s, 3.83 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 0 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 0 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)
4.46 hash searches/s, 12.17 non-hash searches/s
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LOG
---
Log sequence number 13695189
Log flushed up to   13695189
Pages flushed up to 13680936
Last checkpoint at  13679952
0 pending log flushes, 0 pending chkp writes
22339 log i/o's done, 2.14 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       744
Database pages     256
Old database pages 0
Modified db pages  53
Percent of dirty pages(LRU & free pages): 5.295
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 16317, created 631, written 42799
1.89 reads/s, 0.00 creates/s, 3.14 writes/s
Buffer pool hit rate 949 / 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[226]:cur[6], 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=7040, Main thread ID=3472, state: sleeping
Number of rows inserted 1, updated 10252, deleted 0, read 74915
0.00 inserts/s, 0.86 updates/s, 0.00 deletes/s, 4.49 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5494
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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