Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-03-29 10:19:34 0x7fc1980d4700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 44 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 21 srv_active, 0 srv_shutdown, 204 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 44
OS WAIT ARRAY INFO: signal count 44
RW-shared spins 3, rounds 5, OS waits 2
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.67 RW-shared, 0.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9809
Purge done for trx's n:o < 9808 undo n:o < 0 state: running but idle
History list length 69
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421944568656184, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421944568654440, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421944568655312, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421944568653568, 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
1202 OS file reads, 645 OS file writes, 256 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.27 writes/s, 0.20 fsyncs/s
-------------------------------------
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 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
1152.22 hash searches/s, 811.60 non-hash searches/s
---
LOG
---
Log sequence number 51023061
Log buffer assigned up to 51023061
Log buffer completed up to 51023061
Log written up to 51023061
Log flushed up to 51023061
Added dirty pages up to 51023061
Pages flushed up to 51023061
Last checkpoint at 51023061
162 log i/o's done, 0.09 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 588819
Buffer pool size 8192
Free buffers 6917
Database pages 1261
Old database pages 445
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 166, not young 156
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1103, created 164, written 396
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: 1261, unzip_LRU len: 0
I/O sum[6]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=367, Main thread ID=140469084538624 , state=sleeping
Number of rows inserted 197, updated 375, deleted 0, read 674136
0.00 inserts/s, 0.05 updates/s, 0.00 deletes/s, 1719.98 reads/s
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END OF INNODB MONITOR OUTPUT
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