Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2025-04-02 17:43:10 0x7f66b952b700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 10 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 36 srv_active, 0 srv_shutdown, 705 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 67
OS WAIT ARRAY INFO: signal count 69
RW-shared spins 2, rounds 2, OS waits 0
RW-excl spins 3, rounds 90, OS waits 3
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
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TRANSACTIONS
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Trx id counter 9952
Purge done for trx's n:o < 9952 undo n:o < 0 state: running but idle
History list length 42
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421554742905448, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421554742904576, 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
1465 OS file reads, 1114 OS file writes, 421 OS fsyncs
0.10 reads/s, 16384 avg bytes/read, 1.40 writes/s, 1.00 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 9 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 25 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 30 buffer(s)
59699.33 hash searches/s, 445.76 non-hash searches/s
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LOG
---
Log sequence number          50998607
Log buffer assigned up to    50998607
Log buffer completed up to   50998607
Log written up to            50998607
Log flushed up to            50998607
Added dirty pages up to      50998607
Pages flushed up to          50998607
Last checkpoint at           50998607
270 log i/o's done, 0.50 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 137363456
Dictionary memory allocated 606641
Buffer pool size   8192
Free buffers       6639
Database pages     1479
Old database pages 526
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 422, not young 139
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1334, created 415, written 597
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: 1479, unzip_LRU len: 0
I/O sum[80]: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=372, Main thread ID=140079257540352 , state=sleeping
Number of rows inserted 65687, updated 403, deleted 0, read 10791959
0.00 inserts/s, 0.20 updates/s, 0.00 deletes/s, 59957.50 reads/s
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END OF INNODB MONITOR OUTPUT
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