Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-03-16 17:50:30 0x7fece405e700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 44 srv_active, 0 srv_shutdown, 238 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 136
OS WAIT ARRAY INFO: signal count 142
RW-shared spins 14, rounds 24, OS waits 10
RW-excl spins 12, rounds 338, OS waits 13
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.71 RW-shared, 28.17 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 10394
Purge done for trx's n:o < 10393 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422130578786920, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422130578786048, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
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
1387 OS file reads, 2876 OS file writes, 1110 OS fsyncs
0.38 reads/s, 13312 avg bytes/read, 53.00 writes/s, 20.61 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 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 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
6747.80 hash searches/s, 4479.35 non-hash searches/s
---
LOG
---
Log sequence number 51711308
Log buffer assigned up to 51711308
Log buffer completed up to 51711308
Log written up to 51711308
Log flushed up to 51711308
Added dirty pages up to 51711308
Pages flushed up to 51711308
Last checkpoint at 51711308
1245 log i/o's done, 26.87 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 855407
Buffer pool size 8192
Free buffers 6656
Database pages 1521
Old database pages 541
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 730, not young 422
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1254, created 270, written 1440
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: 1521, unzip_LRU len: 0
I/O sum[967]:cur[0], 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=371, Main thread ID=140655092250368 , state=sleeping
Number of rows inserted 651, updated 1074, deleted 102, read 2311164
14.82 inserts/s, 17.69 updates/s, 2.62 deletes/s, 9834.65 reads/s
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END OF INNODB MONITOR OUTPUT
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