Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-19 04:10:06 0x7fe5f80e2700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 26 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 21 srv_active, 0 srv_shutdown, 536 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 50
OS WAIT ARRAY INFO: signal count 50
RW-shared spins 1, rounds 1, OS waits 0
RW-excl spins 4, rounds 99, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.00 RW-shared, 24.75 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9880
Purge done for trx's n:o < 9873 undo n:o < 0 state: running but idle
History list length 98
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422101242853992, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422101242853120, 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
1414 OS file reads, 810 OS file writes, 344 OS fsyncs
0.15 reads/s, 12544 avg bytes/read, 0.85 writes/s, 0.58 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 2 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 30 buffer(s)
289.64 hash searches/s, 112.96 non-hash searches/s
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LOG
---
Log sequence number          51024279
Log buffer assigned up to    51024279
Log buffer completed up to   51024279
Log written up to            51024279
Log flushed up to            51024279
Added dirty pages up to      51024279
Pages flushed up to          51023919
Last checkpoint at           51023919
230 log i/o's done, 0.44 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 597108
Buffer pool size   8192
Free buffers       6659
Database pages     1461
Old database pages 559
Modified db pages  3
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 1303, created 158, written 482
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: 1461, 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=367, Main thread ID=140625757284096 , state=sleeping
Number of rows inserted 73, updated 408, deleted 0, read 511171
0.23 inserts/s, 0.00 updates/s, 0.00 deletes/s, 695.40 reads/s
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END OF INNODB MONITOR OUTPUT
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