Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-14 16:30:21 0x64c4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 21 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 299 srv_active, 0 srv_shutdown, 65948 srv_idle
srv_master_thread log flush and writes: 66247
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 628
OS WAIT ARRAY INFO: signal count 482
RW-shared spins 337, rounds 9994, OS waits 332
RW-excl spins 70, rounds 311, OS waits 3
RW-sx spins 1, rounds 1, OS waits 0
Spin rounds per wait: 29.66 RW-shared, 4.44 RW-excl, 1.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 154373
Purge done for trx's n:o < 154373 undo n:o < 0 state: running but idle
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284371633197632, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633193464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633189296, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633185128, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633180960, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633176792, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633172624, 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
1330 OS file reads, 6009 OS file writes, 3012 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 1.05 writes/s, 0.90 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 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
3.48 hash searches/s, 8.24 non-hash searches/s
---
LOG
---
Log sequence number 83023957
Log flushed up to   83023937
Pages flushed up to 83011468
Last checkpoint at  83008315
0 pending log flushes, 0 pending chkp writes
2073 log i/o's done, 0.67 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 167772160
Dictionary memory allocated 355568
Buffer pool size   8027
Free buffers       6702
Database pages     1316
Old database pages 505
Modified db pages  28
Percent of dirty pages(LRU & free pages): 0.349
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 1185, created 131, written 3581
0.00 reads/s, 0.00 creates/s, 0.29 writes/s
Buffer pool hit rate 1000 / 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: 1316, unzip_LRU len: 0
I/O sum[0]: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=4736, Main thread ID=7232, state: sleeping
Number of rows inserted 14, updated 1072, deleted 0, read 10953253
0.00 inserts/s, 0.57 updates/s, 0.00 deletes/s, 3.48 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5522
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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