Storage engines

InnoDB

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

[ Variable | Bufferpool | InnoDB status ]

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2026-02-06 23:26:05 0x7f2cd03b2700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 63 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 21658 srv_active, 0 srv_shutdown, 18189 srv_idle
srv_master_thread log flush and writes: 39846
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 52451
OS WAIT ARRAY INFO: signal count 43415
RW-shared spins 0, rounds 24697, OS waits 12307
RW-excl spins 0, rounds 8434, OS waits 284
RW-sx spins 6, rounds 180, OS waits 6
Spin rounds per wait: 24697.00 RW-shared, 8434.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 111580
Purge done for trx's n:o < 111580 undo n:o < 0 state: running but idle
History list length 17
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421305447461368, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421305447457112, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421305447452856, 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
865 OS file reads, 264153 OS file writes, 141273 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 1.22 writes/s, 0.94 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)
0.60 hash searches/s, 0.06 non-hash searches/s
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LOG
---
Log sequence number 57017913
Log flushed up to   57017913
Pages flushed up to 57017913
Last checkpoint at  57017904
0 pending log flushes, 0 pending chkp writes
83735 log i/o's done, 0.65 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 128256
Buffer pool size   16024
Free buffers       15106
Database pages     852
Old database pages 334
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
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 706, created 146, written 159857
0.00 reads/s, 0.00 creates/s, 0.48 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: 852, 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=912, Main thread ID=139829698356992, state: sleeping
Number of rows inserted 4, updated 36598, deleted 0, read 891879
0.00 inserts/s, 0.16 updates/s, 0.00 deletes/s, 0.33 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3385
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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