Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-21 15:59:28 0x2db4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 48 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 8236 srv_active, 0 srv_shutdown, 62988 srv_idle
srv_master_thread log flush and writes: 71210
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 3004857
OS WAIT ARRAY INFO: signal count 3376980
RW-shared spins 7102512, rounds 111719666, OS waits 2993654
RW-excl spins 607912, rounds 668849, OS waits 399
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 15.73 RW-shared, 1.10 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 97833
Purge done for trx's n:o < 97833 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282970780197368, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780193200, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780189032, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780184864, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780180696, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780176528, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
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
54895967 OS file reads, 116486 OS file writes, 71033 OS fsyncs
1217.16 reads/s, 16384 avg bytes/read, 2.94 writes/s, 1.87 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 591 merges
merged operations:
 insert 590, delete mark 3, 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 1 buffer(s)
Hash table size 4441, node heap has 6 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 19 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
17362.66 hash searches/s, 9491.20 non-hash searches/s
---
LOG
---
Log sequence number 80255687
Log flushed up to   80255687
Pages flushed up to 80255687
Last checkpoint at  80255636
0 pending log flushes, 0 pending chkp writes
35041 log i/o's done, 1.02 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 97656
Buffer pool size   1003
Free buffers       2
Database pages     971
Old database pages 366
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 8132635, not young 2162719907
122.93 youngs/s, 52484.57 non-youngs/s
Pages read 54895922, created 776, written 67763
1217.16 reads/s, 0.00 creates/s, 1.58 writes/s
Buffer pool hit rate 985 / 1000, young-making rate 1 / 1000 not 625 / 1000
Pages read ahead 189.37/s, evicted without access 10.12/s, Random read ahead 0.00/s
LRU len: 971, unzip_LRU len: 0
I/O sum[53401]:cur[62], 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=4240, Main thread ID=5824, state: sleeping
Number of rows inserted 2508, updated 9975, deleted 3, read 1346572071
0.15 inserts/s, 0.15 updates/s, 0.00 deletes/s, 39791.82 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 12728
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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