Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-07-17 18:34:04 0x76952071e6c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 10 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 236266 srv_active, 0 srv_shutdown, 266246 srv_idle
srv_master_thread log flush and writes: 502493
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 2244817
OS WAIT ARRAY INFO: signal count 938188
RW-shared spins 161831, rounds 4846357, OS waits 161469
RW-excl spins 1311, rounds 39286, OS waits 1286
RW-sx spins 5, rounds 150, OS waits 5
Spin rounds per wait: 29.95 RW-shared, 29.97 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 923548
Purge done for trx's n:o < 923548 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 411857870070024, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 411857870065808, 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: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
225965 OS file reads, 2819619 OS file writes, 1735686 OS fsyncs
0.40 reads/s, 16384 avg bytes/read, 12.00 writes/s, 5.90 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 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 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)
18.30 hash searches/s, 34.30 non-hash searches/s
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LOG
---
Log sequence number 510190552
Log flushed up to   510190268
Pages flushed up to 510187820
Last checkpoint at  510173368
0 pending log flushes, 0 pending chkp writes
926654 log i/o's done, 3.00 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 75640
Buffer pool size   1003
Free buffers       744
Database pages     256
Old database pages 0
Modified db pages  13
Percent of dirty pages(LRU & free pages): 1.299
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 225930, created 14327, written 1596187
0.40 reads/s, 0.10 creates/s, 8.00 writes/s
Buffer pool hit rate 996 / 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[363]: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=1322, Main thread ID=130382028588736, state: sleeping
Number of rows inserted 0, updated 357043, deleted 0, read 3551441
0.00 inserts/s, 1.80 updates/s, 0.00 deletes/s, 14.60 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4022445
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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