Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-03-16 13:11:20 0x3854 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 42 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 32736 srv_active, 0 srv_shutdown, 89702 srv_idle
srv_master_thread log flush and writes: 122438
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 952577
OS WAIT ARRAY INFO: signal count 59940
RW-shared spins 0, rounds 68471, OS waits 31967
RW-excl spins 0, rounds 39453, OS waits 448
RW-sx spins 372, rounds 4901, OS waits 39
Spin rounds per wait: 68471.00 RW-shared, 39453.00 RW-excl, 13.17 RW-sx
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TRANSACTIONS
------------
Trx id counter 1865077
Purge done for trx's n:o < 1865077 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284321760068016, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 284321760063800, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 284321760059584, not started
0 lock struct(s), heap size 1136, 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
163733 OS file reads, 400097 OS file writes, 255466 OS fsyncs
3.95 reads/s, 16384 avg bytes/read, 6.02 writes/s, 4.33 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 23, seg size 25, 251 merges
merged operations:
insert 1051, delete mark 483, delete 367
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 3 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 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
608.75 hash searches/s, 16.33 non-hash searches/s
---
LOG
---
Log sequence number 948027492
Log flushed up to 948027472
Pages flushed up to 948025330
Last checkpoint at 948022124
0 pending log flushes, 0 pending chkp writes
149655 log i/o's done, 2.40 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 940896
Buffer pool size 1002
Free buffers 738
Database pages 257
Old database pages 0
Modified db pages 3
Percent of dirty pages(LRU & free pages): 0.301
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 6898, not young 4761442
0.00 youngs/s, 0.00 non-youngs/s
Pages read 163460, created 4629, written 212954
3.95 reads/s, 0.05 creates/s, 3.00 writes/s
Buffer pool hit rate 998 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.45/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 257, unzip_LRU len: 0
I/O sum[340]:cur[11], 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=4100, Main thread ID=5268, state: sleeping
Number of rows inserted 2394, updated 47614, deleted 1155, read 628845682
0.10 inserts/s, 0.64 updates/s, 0.00 deletes/s, 5234.59 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 15503
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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