Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-13 03:49:57 0x7f573546d700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 20 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 3013 srv_active, 0 srv_shutdown, 10614 srv_idle
srv_master_thread log flush and writes: 13626
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 8259
OS WAIT ARRAY INFO: signal count 7498
RW-shared spins 0, rounds 6645, OS waits 3314
RW-excl spins 0, rounds 679, OS waits 22
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 6645.00 RW-shared, 679.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 46635
Purge done for trx's n:o < 46635 undo n:o < 0 state: running but idle
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421487528825496, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421487528821240, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421487528816984, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421487528812728, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
--------
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, 36906 OS file writes, 21995 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 2.60 writes/s, 2.00 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 9 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 25 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
1.75 hash searches/s, 0.45 non-hash searches/s
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LOG
---
Log sequence number 14853654
Log flushed up to   14853517
Pages flushed up to 14853291
Last checkpoint at  14853282
0 pending log flushes, 0 pending chkp writes
14157 log i/o's done, 1.40 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 128256
Buffer pool size   16024
Free buffers       15117
Database pages     841
Old database pages 328
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.019
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 137, written 20157
0.00 reads/s, 0.00 creates/s, 1.00 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: 841, 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=905, Main thread ID=140012058253056, state: sleeping
Number of rows inserted 1, updated 4474, deleted 0, read 1164050
0.00 inserts/s, 0.45 updates/s, 0.00 deletes/s, 1.10 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 940
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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