Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-29 06:26:43 0x7258 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 41 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 274 srv_active, 0 srv_shutdown, 2437142 srv_idle
srv_master_thread log flush and writes: 2437416
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 9782
OS WAIT ARRAY INFO: signal count 1318
RW-shared spins 552, rounds 16578, OS waits 483
RW-excl spins 127, rounds 2757, OS waits 46
RW-sx spins 2, rounds 26, OS waits 0
Spin rounds per wait: 30.03 RW-shared, 21.71 RW-excl, 13.00 RW-sx
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TRANSACTIONS
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Trx id counter 408863
Purge done for trx's n:o < 408863 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284574732611800, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284574732607632, 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
1871 OS file reads, 4867 OS file writes, 2491 OS fsyncs
0.22 reads/s, 16384 avg bytes/read, 1.05 writes/s, 0.71 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 299, seg size 301, 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 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)
1.32 hash searches/s, 2.85 non-hash searches/s
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LOG
---
Log sequence number 167317387
Log flushed up to   167317387
Pages flushed up to 167317387
Last checkpoint at  167317378
0 pending log flushes, 0 pending chkp writes
1543 log i/o's done, 0.44 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 205328
Buffer pool size   1003
Free buffers       743
Database pages     258
Old database pages 0
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1806, created 273, written 2977
0.22 reads/s, 0.05 creates/s, 0.51 writes/s
Buffer pool hit rate 978 / 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[30]:cur[0], 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=24860, Main thread ID=5724, state: sleeping
Number of rows inserted 109, updated 532, deleted 0, read 22430
0.00 inserts/s, 0.07 updates/s, 0.00 deletes/s, 1.32 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1352
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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