Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-13 07:42:45 0x28dc INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 30 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 282 srv_active, 0 srv_shutdown, 752334 srv_idle
srv_master_thread log flush and writes: 752616
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 5667
OS WAIT ARRAY INFO: signal count 427
RW-shared spins 315, rounds 9280, OS waits 191
RW-excl spins 27, rounds 801, OS waits 9
RW-sx spins 4, rounds 120, OS waits 4
Spin rounds per wait: 29.46 RW-shared, 29.67 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 2778721
Purge done for trx's n:o < 2778719 undo n:o < 0 state: running
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284072595002280, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594998112, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594960600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594956432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594993944, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594989776, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594985608, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594981440, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594977272, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594973104, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594968936, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284072594964768, 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
3700 OS file reads, 5481 OS file writes, 2358 OS fsyncs
0.30 reads/s, 16384 avg bytes/read, 0.30 writes/s, 0.20 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 1 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
1.57 hash searches/s, 2.73 non-hash searches/s
---
LOG
---
Log sequence number 638514963
Log flushed up to   638514963
Pages flushed up to 638513993
Last checkpoint at  638511963
0 pending log flushes, 0 pending chkp writes
1443 log i/o's done, 0.10 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 230368
Buffer pool size   1003
Free buffers       742
Database pages     257
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.300
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 71, not young 42
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3604, created 166, written 3699
0.30 reads/s, 0.00 creates/s, 0.17 writes/s
Buffer pool hit rate 956 / 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[323]:cur[8], 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=4280, Main thread ID=3820, state: sleeping
Number of rows inserted 94, updated 687, deleted 0, read 129924
0.00 inserts/s, 0.10 updates/s, 0.00 deletes/s, 1.70 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2056
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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