Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-16 06:08:48 0x7f5fd296d700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 54 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 44 srv_active, 0 srv_shutdown, 436 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 125
OS WAIT ARRAY INFO: signal count 177
RW-shared spins 98, rounds 103, OS waits 5
RW-excl spins 424, rounds 103, OS waits 18
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.05 RW-shared, 0.24 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10141
Purge done for trx's n:o < 10141 undo n:o < 0 state: running but idle
History list length 47
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421525999480272, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421525999479400, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421525999478528, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
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I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
1364 OS file reads, 2472 OS file writes, 546 OS fsyncs
0.56 reads/s, 16384 avg bytes/read, 2.07 writes/s, 0.87 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 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
13390.92 hash searches/s, 11351.92 non-hash searches/s
---
LOG
---
Log sequence number          51039872
Log buffer assigned up to    51039872
Log buffer completed up to   51039872
Log written up to            51039872
Log flushed up to            51039872
Added dirty pages up to      51039872
Pages flushed up to          51039872
Last checkpoint at           51039872
433 log i/o's done, 0.93 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 662434
Buffer pool size   8192
Free buffers       6787
Database pages     1385
Old database pages 493
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 551, not young 955
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1235, created 1664, written 1201
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 1385, unzip_LRU len: 0
I/O sum[86]: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=371, Main thread ID=140050513995520 , state=sleeping
Number of rows inserted 278770, updated 489, deleted 0, read 8774596
0.02 inserts/s, 0.44 updates/s, 0.00 deletes/s, 15607.17 reads/s
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END OF INNODB MONITOR OUTPUT
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