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 20:31:05 0x2188 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 41 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 6906 srv_active, 0 srv_shutdown, 2815 srv_idle
srv_master_thread log flush and writes: 9721
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 211994
OS WAIT ARRAY INFO: signal count 1636
RW-shared spins 2493, rounds 74321, OS waits 1000
RW-excl spins 49, rounds 1427, OS waits 26
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.81 RW-shared, 29.12 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 42679
Purge done for trx's n:o < 42679 undo n:o < 0 state: running
History list length 16
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284293649216136, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284293649211968, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284293649207800, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284293649203632, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284293649195296, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284293649191128, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284293649199464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284293649186960, 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
13359 OS file reads, 67888 OS file writes, 41604 OS fsyncs
2.93 reads/s, 16384 avg bytes/read, 11.59 writes/s, 5.39 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
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 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
7.51 hash searches/s, 19.58 non-hash searches/s
---
LOG
---
Log sequence number 17954670
Log flushed up to   17954670
Pages flushed up to 17954670
Last checkpoint at  17954585
0 pending log flushes, 0 pending chkp writes
20283 log i/o's done, 2.78 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 110176
Buffer pool size   1003
Free buffers       744
Database pages     256
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 13310, created 467, written 40195
2.93 reads/s, 0.07 creates/s, 7.85 writes/s
Buffer pool hit rate 956 / 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[535]: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=13172, Main thread ID=12944, state: making checkpoint
Number of rows inserted 55, updated 8325, deleted 0, read 113512
0.00 inserts/s, 1.49 updates/s, 0.00 deletes/s, 8.78 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 8656
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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