Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-31 21:54:16 0x7f35f0164700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 21 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 16 srv_active, 0 srv_shutdown, 492 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 34
OS WAIT ARRAY INFO: signal count 34
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 1, rounds 30, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9830
Purge done for trx's n:o < 9829 undo n:o < 0 state: running but idle
History list length 78
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421344758016616, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421344758015744, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
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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
1389 OS file reads, 452 OS file writes, 193 OS fsyncs
0.24 reads/s, 13312 avg bytes/read, 2.24 writes/s, 1.57 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 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 29 buffer(s)
208.75 hash searches/s, 84.52 non-hash searches/s
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LOG
---
Log sequence number          50963436
Log buffer assigned up to    50963436
Log buffer completed up to   50963436
Log written up to            50963436
Log flushed up to            50963436
Added dirty pages up to      50963436
Pages flushed up to          50963436
Last checkpoint at           50963436
113 log i/o's done, 0.76 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 633648
Buffer pool size   8192
Free buffers       6730
Database pages     1393
Old database pages 534
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 1250, created 143, written 271
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: 1393, unzip_LRU len: 0
I/O sum[0]:cur[0], 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=369, Main thread ID=139869273904896 , state=sleeping
Number of rows inserted 9, updated 345, deleted 0, read 396305
0.14 inserts/s, 0.19 updates/s, 0.00 deletes/s, 549.02 reads/s
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END OF INNODB MONITOR OUTPUT
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