Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-30 15:15:15 0x30784e000 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 33 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 3543 srv_active, 0 srv_shutdown, 18659 srv_idle
srv_master_thread log flush and writes: 22202
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 30246
OS WAIT ARRAY INFO: signal count 14946
RW-shared spins 1764, rounds 52740, OS waits 1702
RW-excl spins 163, rounds 3838, OS waits 55
RW-sx spins 19, rounds 570, OS waits 16
Spin rounds per wait: 29.90 RW-shared, 23.55 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 253656
Purge done for trx's n:o < 253641 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422033430159576, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 422033430155376, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
19306 OS file reads, 39016 OS file writes, 23136 OS fsyncs
1.09 reads/s, 16384 avg bytes/read, 5.67 writes/s, 3.12 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 11, seg size 13, 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 11 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
9.00 hash searches/s, 23.51 non-hash searches/s
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LOG
---
Log sequence number 80940481
Log flushed up to   80940085
Pages flushed up to 80940085
Last checkpoint at  80929400
0 pending log flushes, 0 pending chkp writes
12824 log i/o's done, 1.82 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 335104
Buffer pool size   1002
Free buffers       726
Database pages     257
Old database pages 0
Modified db pages  18
Percent of dirty pages(LRU & free pages): 1.829
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 19167, created 436, written 22055
1.09 reads/s, 0.03 creates/s, 3.36 writes/s
Buffer pool hit rate 986 / 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: 257, unzip_LRU len: 0
I/O sum[164]: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=2040, Main thread ID=12999188480, state: sleeping
Number of rows inserted 300, updated 5591, deleted 104, read 2396141
0.00 inserts/s, 0.85 updates/s, 0.00 deletes/s, 11.18 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 17276
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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