Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-31 02:31:58 0x1218 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 45 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 14779 srv_active, 0 srv_shutdown, 2080789 srv_idle
srv_master_thread log flush and writes: 2095568
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 719818
OS WAIT ARRAY INFO: signal count 267980
RW-shared spins 110486, rounds 1691497, OS waits 34842
RW-excl spins 68568, rounds 835669, OS waits 10313
RW-sx spins 32983, rounds 475762, OS waits 7585
Spin rounds per wait: 15.31 RW-shared, 12.19 RW-excl, 14.42 RW-sx
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TRANSACTIONS
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Trx id counter 395638
Purge done for trx's n:o < 395638 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284046279831840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279827672, not started
mysql tables in use 1, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279823504, 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
1227757 OS file reads, 1194129 OS file writes, 348640 OS fsyncs
2.18 reads/s, 16384 avg bytes/read, 7.89 writes/s, 4.96 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, 3332 merges
merged operations:
 insert 58690, delete mark 288153, delete 1017
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)
4.98 hash searches/s, 12.31 non-hash searches/s
---
LOG
---
Log sequence number 161372736
Log flushed up to   161372736
Pages flushed up to 161370601
Last checkpoint at  161363251
0 pending log flushes, 0 pending chkp writes
252288 log i/o's done, 2.47 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 155248
Buffer pool size   1003
Free buffers       739
Database pages     256
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.502
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1868, not young 414883
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1227699, created 5664, written 905437
2.18 reads/s, 0.09 creates/s, 4.44 writes/s
Buffer pool hit rate 958 / 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[310]:cur[1], 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=5804, Main thread ID=2984, state: sleeping
Number of rows inserted 177591, updated 15854, deleted 177007, read 6223890
0.00 inserts/s, 1.16 updates/s, 0.00 deletes/s, 20.20 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 17659
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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