Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-20 12:51:50 0xb6c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 42 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 71 srv_active, 0 srv_shutdown, 47670 srv_idle
srv_master_thread log flush and writes: 47741
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 2722
OS WAIT ARRAY INFO: signal count 144
RW-shared spins 84, rounds 2520, OS waits 66
RW-excl spins 2, rounds 60, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 197974
Purge done for trx's n:o < 197974 undo n:o < 0 state: running
History list length 24
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283999273926872, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273922704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273935208, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273947712, 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
3144 OS file reads, 1138 OS file writes, 586 OS fsyncs
1.12 reads/s, 16384 avg bytes/read, 4.48 writes/s, 1.88 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 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 1 buffer(s)
5.07 hash searches/s, 14.55 non-hash searches/s
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LOG
---
Log sequence number 139511186
Log flushed up to   139511166
Pages flushed up to 139508646
Last checkpoint at  139498646
0 pending log flushes, 0 pending chkp writes
352 log i/o's done, 1.10 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 333032
Buffer pool size   1003
Free buffers       740
Database pages     260
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.500
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 327, not young 5251
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3008, created 140, written 707
1.12 reads/s, 0.10 creates/s, 3.12 writes/s
Buffer pool hit rate 971 / 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: 260, unzip_LRU len: 0
I/O sum[160]:cur[18], 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=4932, Main thread ID=7240, state: sleeping
Number of rows inserted 0, updated 133, deleted 0, read 115718
0.00 inserts/s, 0.81 updates/s, 0.00 deletes/s, 5.12 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1851
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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