Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2025-04-20 00:00:13 136578337855168 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 7 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 12 srv_active, 0 srv_shutdown, 410140 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 3035
OS WAIT ARRAY INFO: signal count 2849
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 4288
Purge done for trx's n:o < 4288 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 418053395320024, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 418053395319216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 418053395318408, 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 completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (read 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 (write 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)
Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
 ibuf aio reads:
Pending flushes (fsync) log: 0; buffer pool: 0
1190 OS file reads, 798 OS file writes, 491 OS fsyncs
0.50 reads/s, 16384 avg bytes/read, 1.26 writes/s, 1.01 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 34679, node heap has 7 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
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 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
1633.77 hash searches/s, 751.18 non-hash searches/s
---
LOG
---
Log sequence number          20934978
Log buffer assigned up to    20934978
Log buffer completed up to   20934978
Log written up to            20934978
Log flushed up to            20934978
Added dirty pages up to      20934978
Pages flushed up to          20934412
Last checkpoint at           20934412
Log minimum file id is       6
Log maximum file id is       6
271 log i/o's done, 0.62 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 0
Dictionary memory allocated 643896
Buffer pool size   8191
Free buffers       6875
Database pages     1296
Old database pages 458
Modified db pages  4
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 431, not young 5406
0.88 youngs/s, 3.02 non-youngs/s
Pages read 1153, created 161, written 410
0.50 reads/s, 0.00 creates/s, 0.50 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: 1296, unzip_LRU len: 0
I/O sum[1]:cur[8], 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=231021, Main thread ID=136577810433728 , state=sleeping
Number of rows inserted 276, updated 0, deleted 0, read 460
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
Number of system rows inserted 136, updated 347, deleted 8, read 108984
0.00 inserts/s, 0.29 updates/s, 0.00 deletes/s, 2108.70 reads/s
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END OF INNODB MONITOR OUTPUT
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