Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-11-11 13:59:44 0x938 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: 0 srv_active, 0 srv_shutdown, 0 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 546
OS WAIT ARRAY INFO: signal count 450
RW-shared spins 348, rounds 6779, OS waits 208
RW-excl spins 1370, rounds 1444, OS waits 21
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 19.48 RW-shared, 1.05 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 7834281
Purge done for trx's n:o < 0 undo n:o < 0 state: disabled
History list length 714997
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283244458754264, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283244458750096, 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
117908 OS file reads, 53061 OS file writes, 32285 OS fsyncs
11.56 reads/s, 16384 avg bytes/read, 19.17 writes/s, 9.94 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 253, free list len 152, seg size 406, 7 merges
merged operations:
 insert 87, delete mark 150, 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)
19.09 hash searches/s, 66.60 non-hash searches/s
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LOG
---
Log sequence number 11966175152
Log flushed up to   11966175152
Pages flushed up to 11966160816
Last checkpoint at  11964717732
0 pending log flushes, 0 pending chkp writes
12994 log i/o's done, 5.38 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 733672
Buffer pool size   1003
Free buffers       739
Database pages     256
Old database pages 0
Modified db pages  27
Percent of dirty pages(LRU & free pages): 2.711
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1098, not young 787096
0.00 youngs/s, 0.00 non-youngs/s
Pages read 117634, created 1982, written 33099
11.56 reads/s, 0.21 creates/s, 11.78 writes/s
Buffer pool hit rate 922 / 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: 256, unzip_LRU len: 0
I/O sum[1169]:cur[7], 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=0, Main thread ID=0, state: 
Number of rows inserted 2146, updated 11113, deleted 92, read 10409401
0.00 inserts/s, 5.38 updates/s, 0.00 deletes/s, 74.38 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 31982
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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