Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-08-31 22:45:29 0x7f645fbb46c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 24 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 335 srv_active, 0 srv_shutdown, 684533 srv_idle
srv_master_thread log flush and writes: 684662
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 17672
OS WAIT ARRAY INFO: signal count 5976
RW-shared spins 10574, rounds 25062, OS waits 222
RW-excl spins 358, rounds 1032, OS waits 20
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 2.37 RW-shared, 2.88 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 32532
Purge done for trx's n:o < 32532 undo n:o < 0 state: running but idle
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421544007033096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421544007028880, 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
1096429 OS file reads, 5611 OS file writes, 2560 OS fsyncs
5.00 reads/s, 16384 avg bytes/read, 5.50 writes/s, 4.46 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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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 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 1 buffer(s)
14.71 hash searches/s, 37.17 non-hash searches/s
---
LOG
---
Log sequence number 850973470
Log flushed up to 850973450
Pages flushed up to 850909736
Last checkpoint at 850904114
0 pending log flushes, 0 pending chkp writes
1736 log i/o's done, 3.29 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 183000
Buffer pool size 1003
Free buffers 743
Database pages 257
Old database pages 0
Modified db pages 119
Percent of dirty pages(LRU & free pages): 11.888
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 32398, not young 21110637
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1096351, created 168, written 3544
5.00 reads/s, 0.08 creates/s, 1.67 writes/s
Buffer pool hit rate 964 / 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[584]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=1143, Main thread ID=140068211652288, state: sleeping
Number of rows inserted 3, updated 1129, deleted 0, read 39574407
0.00 inserts/s, 2.83 updates/s, 0.00 deletes/s, 14.08 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1552
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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