Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-01 03:20:48 0x4834 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 55 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 18453 srv_active, 0 srv_shutdown, 2166040 srv_idle
srv_master_thread log flush and writes: 2184493
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 759539
OS WAIT ARRAY INFO: signal count 274446
RW-shared spins 111537, rounds 1722967, OS waits 35813
RW-excl spins 68684, rounds 838394, OS waits 10370
RW-sx spins 32983, rounds 475762, OS waits 7585
Spin rounds per wait: 15.45 RW-shared, 12.21 RW-excl, 14.42 RW-sx
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TRANSACTIONS
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Trx id counter 406309
Purge done for trx's n:o < 406307 undo n:o < 0 state: running but idle
History list length 14
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284046279848512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279844344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279840176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279836008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279831840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279827672, not started
mysql tables in use 1, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279823504, 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
1236090 OS file reads, 1233050 OS file writes, 371120 OS fsyncs
1.07 reads/s, 16384 avg bytes/read, 3.95 writes/s, 2.02 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 299, seg size 301, 3332 merges
merged operations:
 insert 58690, delete mark 288153, delete 1017
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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
4.96 hash searches/s, 14.11 non-hash searches/s
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LOG
---
Log sequence number 166062119
Log flushed up to   166062119
Pages flushed up to 166060924
Last checkpoint at  166060915
0 pending log flushes, 0 pending chkp writes
263142 log i/o's done, 1.27 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 155248
Buffer pool size   1003
Free buffers       738
Database pages     257
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.301
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1868, not young 414883
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1236032, created 5875, written 929493
1.07 reads/s, 0.00 creates/s, 2.42 writes/s
Buffer pool hit rate 972 / 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: 257, unzip_LRU len: 0
I/O sum[191]:cur[1], 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=5804, Main thread ID=2984, state: sleeping
Number of rows inserted 177698, updated 21052, deleted 177007, read 6448518
0.00 inserts/s, 0.71 updates/s, 0.00 deletes/s, 6.05 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 21920
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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