Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-04-19 20:49:08 0x2a4c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 26 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5650 srv_active, 0 srv_shutdown, 366915 srv_idle
srv_master_thread log flush and writes: 372556
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 15596
OS WAIT ARRAY INFO: signal count 15559
RW-shared spins 10322, rounds 309400, OS waits 10312
RW-excl spins 161, rounds 1486, OS waits 15
RW-sx spins 2, rounds 60, OS waits 2
Spin rounds per wait: 29.97 RW-shared, 9.23 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 14833
Purge done for trx's n:o < 14833 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283762600505920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600497584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600489248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600501752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600493416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600485080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283762600480912, 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
12545 OS file reads, 71716 OS file writes, 52283 OS fsyncs
0.31 reads/s, 16384 avg bytes/read, 0.69 writes/s, 0.58 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)
8.15 hash searches/s, 6.65 non-hash searches/s
---
LOG
---
Log sequence number 9705032
Log flushed up to   9705012
Pages flushed up to 9698002
Last checkpoint at  9697993
0 pending log flushes, 0 pending chkp writes
33283 log i/o's done, 0.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 97656
Buffer pool size   1003
Free buffers       741
Database pages     256
Old database pages 0
Modified db pages  13
Percent of dirty pages(LRU & free pages): 1.303
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 12502, created 421, written 31750
0.31 reads/s, 0.00 creates/s, 0.15 writes/s
Buffer pool hit rate 992 / 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: 256, unzip_LRU len: 0
I/O sum[12]: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=4532, Main thread ID=12972, state: sleeping
Number of rows inserted 120, updated 6308, deleted 0, read 6641988
0.00 inserts/s, 0.23 updates/s, 0.00 deletes/s, 74.73 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5286
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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