Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-02 17:16:03 0x3048 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 30 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 2216 srv_active, 0 srv_shutdown, 16701 srv_idle
srv_master_thread log flush and writes: 18917
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 32144
OS WAIT ARRAY INFO: signal count 2983
RW-shared spins 1162, rounds 33393, OS waits 1029
RW-excl spins 553, rounds 4366, OS waits 96
RW-sx spins 9, rounds 241, OS waits 7
Spin rounds per wait: 28.74 RW-shared, 7.90 RW-excl, 26.78 RW-sx
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TRANSACTIONS
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Trx id counter 164901
Purge done for trx's n:o < 164901 undo n:o < 0 state: running but idle
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283174979428568, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283174979424400, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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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
15978 OS file reads, 28694 OS file writes, 15160 OS fsyncs
5.97 reads/s, 16384 avg bytes/read, 10.13 writes/s, 4.20 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 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 1 buffer(s)
23.23 hash searches/s, 34.27 non-hash searches/s
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LOG
---
Log sequence number 102100089
Log flushed up to   102100069
Pages flushed up to 102089943
Last checkpoint at  102087385
0 pending log flushes, 0 pending chkp writes
8360 log i/o's done, 3.23 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 776240
Buffer pool size   1003
Free buffers       737
Database pages     258
Old database pages 0
Modified db pages  44
Percent of dirty pages(LRU & free pages): 4.418
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 351, not young 4427
0.00 youngs/s, 0.00 non-youngs/s
Pages read 15664, created 347, written 17899
5.97 reads/s, 0.07 creates/s, 6.47 writes/s
Buffer pool hit rate 974 / 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: 258, unzip_LRU len: 0
I/O sum[703]:cur[1], 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=3696, Main thread ID=5316, state: sleeping
Number of rows inserted 147, updated 4114, deleted 52, read 272544
0.00 inserts/s, 2.47 updates/s, 0.00 deletes/s, 39.83 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 16069
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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