Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2025-12-06 09:58:13 0x7f03701046c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 19 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 20627 srv_active, 0 srv_shutdown, 5667789 srv_idle
srv_master_thread log flush and writes: 5687309
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 58548
OS WAIT ARRAY INFO: signal count 56373
RW-shared spins 41256, rounds 1237671, OS waits 41169
RW-excl spins 14, rounds 415, OS waits 12
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 RW-shared, 29.64 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 65462
Purge done for trx's n:o < 65462 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421127737086216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421127737082000, 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: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
20859 OS file reads, 269896 OS file writes, 194729 OS fsyncs
0.21 reads/s, 16384 avg bytes/read, 1.47 writes/s, 0.37 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 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
0.79 hash searches/s, 2.74 non-hash searches/s
---
LOG
---
Log sequence number 29382327
Log flushed up to 29382327
Pages flushed up to 29382327
Last checkpoint at 29377754
0 pending log flushes, 0 pending chkp writes
127162 log i/o's done, 0.21 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size 1002
Free buffers 744
Database pages 256
Old database pages 0
Modified db pages 0
Percent of dirty pages(LRU & free pages): 0.000
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 20825, created 894, written 120667
0.21 reads/s, 0.11 creates/s, 1.21 writes/s
Buffer pool hit rate 985 / 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[4]:cur[23], 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=284, Main thread ID=139652363142848, state: sleeping
Number of rows inserted 56, updated 23952, deleted 0, read 461473
0.00 inserts/s, 0.16 updates/s, 0.00 deletes/s, 0.74 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 25101
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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