Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-31 16:31:25 0x1ccc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 29 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 259 srv_active, 0 srv_shutdown, 29649 srv_idle
srv_master_thread log flush and writes: 29908
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1049
OS WAIT ARRAY INFO: signal count 374
RW-shared spins 210, rounds 6039, OS waits 200
RW-excl spins 16, rounds 229, OS waits 7
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 28.76 RW-shared, 14.31 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 5181
Purge done for trx's n:o < 5181 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283604788568496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283604788564328, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283604788560160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283604788555992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283604788551824, 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: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
3093 OS file reads, 6334 OS file writes, 2778 OS fsyncs
6.24 reads/s, 16384 avg bytes/read, 17.55 writes/s, 7.10 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 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
18.21 hash searches/s, 44.58 non-hash searches/s
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LOG
---
Log sequence number 5613412
Log flushed up to   5613392
Pages flushed up to 5611960
Last checkpoint at  5611951
0 pending log flushes, 0 pending chkp writes
1912 log i/o's done, 4.79 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 170272
Buffer pool size   1003
Free buffers       739
Database pages     261
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.300
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 7, not young 132
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3019, created 155, written 4074
5.00 reads/s, 0.22 creates/s, 8.30 writes/s
Buffer pool hit rate 967 / 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: 261, unzip_LRU len: 0
I/O sum[537]:cur[5], 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=18340, Main thread ID=17448, state: sleeping
Number of rows inserted 13, updated 1281, deleted 0, read 20438
0.00 inserts/s, 3.93 updates/s, 0.00 deletes/s, 48.38 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2632
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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