Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-09 11:44:03 0x6914 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 48 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 487 srv_active, 0 srv_shutdown, 15382 srv_idle
srv_master_thread log flush and writes: 15869
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 28819
OS WAIT ARRAY INFO: signal count 5059
RW-shared spins 320, rounds 8512, OS waits 263
RW-excl spins 28, rounds 270, OS waits 7
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 26.60 RW-shared, 9.64 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 468747
Purge done for trx's n:o < 468747 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283896405553800, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283896405549632, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283896405545464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283896405541296, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283896405537128, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283896405532960, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283896405528792, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283896405524624, 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
9033 OS file reads, 8252 OS file writes, 3977 OS fsyncs
24.42 reads/s, 16384 avg bytes/read, 8.48 writes/s, 4.60 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 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)
9.23 hash searches/s, 44.08 non-hash searches/s
---
LOG
---
Log sequence number 580205681
Log flushed up to   580205681
Pages flushed up to 580191421
Last checkpoint at  580191421
0 pending log flushes, 0 pending chkp writes
2429 log i/o's done, 2.79 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 868888
Buffer pool size   1003
Free buffers       741
Database pages     256
Old database pages 0
Modified db pages  30
Percent of dirty pages(LRU & free pages): 3.006
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 161, not young 116205
0.67 youngs/s, 632.11 non-youngs/s
Pages read 8683, created 194, written 5222
24.42 reads/s, 0.02 creates/s, 4.96 writes/s
Buffer pool hit rate 979 / 1000, young-making rate 0 / 1000 not 529 / 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[1420]: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=5740, Main thread ID=5716, state: sleeping
Number of rows inserted 0, updated 1393, deleted 0, read 297549
0.00 inserts/s, 1.58 updates/s, 0.00 deletes/s, 1778.48 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 8698
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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