Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-11-11 07:28:30 0x146c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 31 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 773 srv_active, 0 srv_shutdown, 593012 srv_idle
srv_master_thread log flush and writes: 593785
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 12277
OS WAIT ARRAY INFO: signal count 1917
RW-shared spins 450, rounds 12799, OS waits 414
RW-excl spins 207, rounds 2545, OS waits 58
RW-sx spins 3, rounds 60, OS waits 1
Spin rounds per wait: 28.44 RW-shared, 12.29 RW-excl, 20.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 66916
Purge done for trx's n:o < 66916 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283271831687672, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283271831683504, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283271831675168, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283271831671000, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283271831666832, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283271831704344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283271831696008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283271831679336, 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
4685 OS file reads, 10749 OS file writes, 5998 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 1 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)
1.71 hash searches/s, 4.35 non-hash searches/s
---
LOG
---
Log sequence number 37265019
Log flushed up to   37265019
Pages flushed up to 37265019
Last checkpoint at  37265010
0 pending log flushes, 0 pending chkp writes
3303 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 225360
Buffer pool size   1003
Free buffers       713
Database pages     286
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 4597, created 235, written 6265
0.00 reads/s, 0.00 creates/s, 0.00 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: 286, unzip_LRU len: 0
I/O sum[0]:cur[0], 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=16296, Main thread ID=15852, state: sleeping
Number of rows inserted 29, updated 1835, deleted 0, read 17834
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1.71 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3650
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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