Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-02-28 17:01:23 0x7f4aeaf99700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 36 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 9 srv_active, 0 srv_shutdown, 26 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 31
OS WAIT ARRAY INFO: signal count 34
RW-shared spins 2, rounds 3, OS waits 1
RW-excl spins 12, rounds 107, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.50 RW-shared, 8.92 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9884
Purge done for trx's n:o < 9879 undo n:o < 0 state: running but idle
History list length 104
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421435385604712, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421435385603840, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
1379 OS file reads, 511 OS file writes, 168 OS fsyncs
37.27 reads/s, 19735 avg bytes/read, 13.81 writes/s, 4.54 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 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
11778.70 hash searches/s, 9940.95 non-hash searches/s
---
LOG
---
Log sequence number 50975894
Log buffer assigned up to 50975894
Log buffer completed up to 50975894
Log written up to 50975894
Log flushed up to 50975894
Added dirty pages up to 50975894
Pages flushed up to 50975894
Last checkpoint at 50975894
159 log i/o's done, 4.18 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 589093
Buffer pool size 8192
Free buffers 6790
Database pages 1387
Old database pages 529
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 150, not young 359
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1242, created 148, written 302
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 1387, unzip_LRU len: 0
I/O sum[300]:cur[1], 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=384, Main thread ID=139959900247808 , state=sleeping
Number of rows inserted 57, updated 371, deleted 0, read 531477
1.58 inserts/s, 10.31 updates/s, 0.00 deletes/s, 14762.84 reads/s
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END OF INNODB MONITOR OUTPUT
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