Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-04 04:56:49 0x1e18 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 16 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 8584 srv_active, 0 srv_shutdown, 5258798 srv_idle
srv_master_thread log flush and writes: 5267382
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 208938
OS WAIT ARRAY INFO: signal count 26206
RW-shared spins 16648, rounds 498193, OS waits 16457
RW-excl spins 155, rounds 4569, OS waits 125
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.93 RW-shared, 29.48 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 19037
Purge done for trx's n:o < 19037 undo n:o < 0 state: running
History list length 10
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283189280547896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280543728, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280539560, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280535392, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280531224, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280527056, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280522888, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280518720, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280514552, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280510384, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280506216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280502048, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280497880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283189280493712, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
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
14571 OS file reads, 107340 OS file writes, 77568 OS fsyncs
2.69 reads/s, 16384 avg bytes/read, 15.81 writes/s, 3.37 fsyncs/s
-------------------------------------
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 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)
10.19 hash searches/s, 27.62 non-hash searches/s
---
LOG
---
Log sequence number 13511620
Log flushed up to   13511620
Pages flushed up to 13507975
Last checkpoint at  13507932
0 pending log flushes, 0 pending chkp writes
51037 log i/o's done, 2.31 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       741
Database pages     259
Old database pages 0
Modified db pages  7
Percent of dirty pages(LRU & free pages): 0.699
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 14535, created 548, written 47282
2.69 reads/s, 0.00 creates/s, 13.06 writes/s
Buffer pool hit rate 968 / 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: 259, unzip_LRU len: 0
I/O sum[370]:cur[3], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=3476, Main thread ID=3996, state: sleeping
Number of rows inserted 1, updated 9415, deleted 0, read 71888
0.00 inserts/s, 1.69 updates/s, 0.00 deletes/s, 10.06 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3734
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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