Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-19 11:02:21 0x52bc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 433922 srv_active, 0 srv_shutdown, 5972401 srv_idle
srv_master_thread log flush and writes: 6406323
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 19871890
OS WAIT ARRAY INFO: signal count 3970583
RW-shared spins 1398496, rounds 23084079, OS waits 652974
RW-excl spins 1246427, rounds 6335755, OS waits 34656
RW-sx spins 27734, rounds 569180, OS waits 11046
Spin rounds per wait: 16.51 RW-shared, 5.08 RW-excl, 20.52 RW-sx
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TRANSACTIONS
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Trx id counter 5857086
Purge done for trx's n:o < 5857086 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283371855434232, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855430064, ACTIVE 0 sec starting index read
mysql tables in use 1, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
MySQL thread id 2276993, OS thread handle 23912, query id 169145989 localhost 127.0.0.1 root Sending data
SELECT * FROM `stripepaymentreceipt` LIMIT 0, 25
Trx read view will not see trx with id >= 5857086, sees < 5857086
---TRANSACTION 283371855425896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855421728, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855417560, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855413392, 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
63397784 OS file reads, 12256055 OS file writes, 5079503 OS fsyncs
1 pending reads, 0 pending writes
4.56 reads/s, 16384 avg bytes/read, 4.87 writes/s, 2.46 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 35, seg size 37, 79182 merges
merged operations:
 insert 114128, delete mark 41566, delete 7866
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 2 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)
Hash table size 4441, node heap has 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
15.97 hash searches/s, 24.49 non-hash searches/s
---
LOG
---
Log sequence number 33297130159
Log flushed up to   33297128890
Pages flushed up to 33297097506
Last checkpoint at  33297091948
0 pending log flushes, 0 pending chkp writes
2658594 log i/o's done, 1.54 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1567504
Buffer pool size   1003
Free buffers       714
Database pages     278
Old database pages 0
Modified db pages  73
Percent of dirty pages(LRU & free pages): 7.351
Max dirty pages percent: 75.000
Pending reads 2
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 3289858, not young 258844709
0.00 youngs/s, 0.00 non-youngs/s
Pages read 63397377, created 888166, written 8748178
4.51 reads/s, 0.00 creates/s, 2.87 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: 278, unzip_LRU len: 0
I/O sum[385]:cur[42], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Process ID=17232, Main thread ID=9312, state: sleeping
Number of rows inserted 3476837, updated 1358649, deleted 233603, read 3376635578
0.00 inserts/s, 1.21 updates/s, 0.00 deletes/s, 107.87 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4074760
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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