Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-13 07:52:37 0x2a74 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 35 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 406 srv_active, 0 srv_shutdown, 752766 srv_idle
srv_master_thread log flush and writes: 753172
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 7965
OS WAIT ARRAY INFO: signal count 519
RW-shared spins 390, rounds 11504, OS waits 235
RW-excl spins 44, rounds 1277, OS waits 11
RW-sx spins 4, rounds 120, OS waits 4
Spin rounds per wait: 29.50 RW-shared, 29.02 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 2779520
Purge done for trx's n:o < 2779520 undo n:o < 0 state: running but idle
History list length 24
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284072594960600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594956432, 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
4421 OS file reads, 7888 OS file writes, 3317 OS fsyncs
1.91 reads/s, 16384 avg bytes/read, 9.60 writes/s, 2.06 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 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
3.60 hash searches/s, 11.11 non-hash searches/s
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LOG
---
Log sequence number 639029168
Log flushed up to   639029168
Pages flushed up to 639029168
Last checkpoint at  639029125
0 pending log flushes, 0 pending chkp writes
2023 log i/o's done, 1.23 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 230368
Buffer pool size   1003
Free buffers       824
Database pages     175
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 71, not young 42
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4325, created 183, written 5381
1.91 reads/s, 0.03 creates/s, 7.97 writes/s
Buffer pool hit rate 955 / 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: 175, unzip_LRU len: 0
I/O sum[379]: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=4280, Main thread ID=3820, state: sleeping
Number of rows inserted 94, updated 1086, deleted 0, read 132178
0.00 inserts/s, 0.83 updates/s, 0.00 deletes/s, 3.63 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2058
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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