Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-02 04:51:09 0x7f0f944cf700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 9 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 12065 srv_active, 0 srv_shutdown, 5155 srv_idle
srv_master_thread log flush and writes: 17220
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 29873
OS WAIT ARRAY INFO: signal count 24989
RW-shared spins 0, rounds 9733, OS waits 4837
RW-excl spins 0, rounds 4473, OS waits 150
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 9733.00 RW-shared, 4473.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 83172
Purge done for trx's n:o < 83172 undo n:o < 0 state: running but idle
History list length 21
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421179866444280, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421179866440024, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421179866435768, 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
863 OS file reads, 153772 OS file writes, 78396 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 7.67 writes/s, 5.44 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 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 10 buffer(s)
Hash table size 69257, node heap has 2 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 3 buffer(s)
Hash table size 69257, node heap has 26 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
5.89 hash searches/s, 1.11 non-hash searches/s
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LOG
---
Log sequence number 39695013
Log flushed up to   39694892
Pages flushed up to 39690913
Last checkpoint at  39689463
0 pending log flushes, 0 pending chkp writes
44932 log i/o's done, 3.00 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 285212672
Dictionary memory allocated 130928
Buffer pool size   16024
Free buffers       15102
Database pages     854
Old database pages 331
Modified db pages  7
Percent of dirty pages(LRU & free pages): 0.044
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 704, created 150, written 96447
0.00 reads/s, 0.00 creates/s, 3.78 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: 854, unzip_LRU len: 0
I/O sum[0]: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=904, Main thread ID=139704120887040, state: sleeping
Number of rows inserted 1, updated 22585, deleted 0, read 1338060
0.00 inserts/s, 1.67 updates/s, 0.00 deletes/s, 3.33 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4412
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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