Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-19 22:29:57 0x4d0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 9 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 9807 srv_active, 0 srv_shutdown, 17821 srv_idle
srv_master_thread log flush and writes: 27628
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 34079
OS WAIT ARRAY INFO: signal count 18040
RW-shared spins 20180, rounds 372247, OS waits 9760
RW-excl spins 22124, rounds 92766, OS waits 1460
RW-sx spins 510, rounds 5781, OS waits 141
Spin rounds per wait: 18.45 RW-shared, 4.19 RW-excl, 11.34 RW-sx
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TRANSACTIONS
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Trx id counter 27280
Purge done for trx's n:o < 27280 undo n:o < 0 state: running but idle
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283738057933088, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283738057928920, not started flushing log
mysql tables in use 1, locked 1
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283738057924752, 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: 1; buffer pool: 0
66672 OS file reads, 111551 OS file writes, 67111 OS fsyncs
2.11 reads/s, 16384 avg bytes/read, 10.78 writes/s, 5.44 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 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)
5.44 hash searches/s, 17.22 non-hash searches/s
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LOG
---
Log sequence number 51378345
Log flushed up to   51377817
Pages flushed up to 51377902
Last checkpoint at  51372344
1 pending log flushes, 0 pending chkp writes
34028 log i/o's done, 2.56 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 403144
Buffer pool size   1003
Free buffers       740
Database pages     257
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.301
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 546, not young 140805
0.00 youngs/s, 0.00 non-youngs/s
Pages read 66628, created 3701, written 66222
2.11 reads/s, 0.44 creates/s, 7.33 writes/s
Buffer pool hit rate 976 / 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[528]:cur[14], 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=8680, Main thread ID=7376, state: making checkpoint
Number of rows inserted 107782, updated 10234, deleted 1, read 4109952
0.11 inserts/s, 1.44 updates/s, 0.11 deletes/s, 66.66 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 20439
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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