Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-01-19 07:18:41 0x7f21c4093700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 51 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 13 srv_active, 0 srv_shutdown, 160 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 32
OS WAIT ARRAY INFO: signal count 32
RW-shared spins 1, rounds 1, OS waits 0
RW-excl spins 2, rounds 60, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9878
Purge done for trx's n:o < 9863 undo n:o < 0 state: running but idle
History list length 102
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421258843912808, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421258843911936, 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
1470 OS file reads, 613 OS file writes, 230 OS fsyncs
3.94 reads/s, 15161 avg bytes/read, 1.98 writes/s, 1.10 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 1 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 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
515.07 hash searches/s, 255.92 non-hash searches/s
---
LOG
---
Log sequence number 50989915
Log buffer assigned up to 50989915
Log buffer completed up to 50989915
Log written up to 50989915
Log flushed up to 50989915
Added dirty pages up to 50989915
Pages flushed up to 50989915
Last checkpoint at 50989915
179 log i/o's done, 0.82 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 613452
Buffer pool size 8192
Free buffers 6685
Database pages 1494
Old database pages 571
Modified db pages 0
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 1345, created 149, written 365
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 999 / 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: 1494, unzip_LRU len: 0
I/O sum[0]: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=364, Main thread ID=139783429080832 , state=sleeping
Number of rows inserted 25, updated 380, deleted 0, read 220490
0.02 inserts/s, 0.33 updates/s, 0.00 deletes/s, 1140.37 reads/s
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END OF INNODB MONITOR OUTPUT
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