Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-30 20:04:13 0x3ce4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 23 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 11616 srv_active, 0 srv_shutdown, 1101009 srv_idle
srv_master_thread log flush and writes: 1112625
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 20963
OS WAIT ARRAY INFO: signal count 23624
RW-shared spins 25954, rounds 391428, OS waits 12576
RW-excl spins 4408, rounds 12845, OS waits 68
RW-sx spins 44, rounds 565, OS waits 12
Spin rounds per wait: 15.08 RW-shared, 2.91 RW-excl, 12.84 RW-sx
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TRANSACTIONS
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Trx id counter 37041
Purge done for trx's n:o < 37041 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284376167305792, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284376167301624, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284376167297456, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284376167293288, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284376167289120, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284376167284952, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284376167280784, 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
38263 OS file reads, 164407 OS file writes, 97917 OS fsyncs
3.22 reads/s, 16384 avg bytes/read, 4.43 writes/s, 1.74 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 8 merges
merged operations:
 insert 13, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 3 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
Hash table size 4441, node heap has 3 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
Hash table size 4441, node heap has 3 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 3 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
409.20 hash searches/s, 26.30 non-hash searches/s
---
LOG
---
Log sequence number 21677428
Log flushed up to   21677428
Pages flushed up to 21677428
Last checkpoint at  21677419
0 pending log flushes, 0 pending chkp writes
54669 log i/o's done, 1.26 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 110176
Buffer pool size   1003
Free buffers       693
Database pages     291
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 38227, created 985, written 94559
3.22 reads/s, 0.04 creates/s, 2.96 writes/s
Buffer pool hit rate 997 / 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: 291, unzip_LRU len: 0
I/O sum[297]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=12472, Main thread ID=13180, state: sleeping
Number of rows inserted 4437, updated 19888, deleted 565, read 300574516
0.00 inserts/s, 0.83 updates/s, 0.00 deletes/s, 681.19 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 17190
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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