Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-22 01:09:27 0x28b8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 58 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 24653 srv_active, 0 srv_shutdown, 25470 srv_idle
srv_master_thread log flush and writes: 50123
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 170055
OS WAIT ARRAY INFO: signal count 29852
RW-shared spins 13689, rounds 391487, OS waits 11879
RW-excl spins 7824, rounds 40332, OS waits 334
RW-sx spins 297, rounds 4231, OS waits 36
Spin rounds per wait: 28.60 RW-shared, 5.15 RW-excl, 14.25 RW-sx
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TRANSACTIONS
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Trx id counter 67015
Purge done for trx's n:o < 67015 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283466441990720, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466441986552, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466441982384, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466441978216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466441974048, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466441969880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466441965712, 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
64564 OS file reads, 252036 OS file writes, 158687 OS fsyncs
3.24 reads/s, 16384 avg bytes/read, 4.40 writes/s, 2.72 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 226 merges
merged operations:
 insert 227, 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 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 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
10.65 hash searches/s, 33.12 non-hash searches/s
---
LOG
---
Log sequence number 50155973
Log flushed up to   50155953
Pages flushed up to 50123423
Last checkpoint at  50123335
0 pending log flushes, 0 pending chkp writes
77640 log i/o's done, 1.62 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 222856
Buffer pool size   1003
Free buffers       735
Database pages     259
Old database pages 0
Modified db pages  65
Percent of dirty pages(LRU & free pages): 6.533
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 4, not young 165
0.00 youngs/s, 0.00 non-youngs/s
Pages read 64475, created 2476, written 147355
3.24 reads/s, 0.05 creates/s, 2.33 writes/s
Buffer pool hit rate 963 / 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: 259, unzip_LRU len: 0
I/O sum[319]:cur[4], 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=7136, Main thread ID=1828, state: sleeping
Number of rows inserted 19429, updated 28285, deleted 27, read 7405502
0.00 inserts/s, 1.02 updates/s, 0.00 deletes/s, 12.67 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 144383
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 17.57 reads/s
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END OF INNODB MONITOR OUTPUT
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