Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-19 08:52:02 0x7f9aa8e4d700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 9 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 52 srv_active, 0 srv_shutdown, 322 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 407
OS WAIT ARRAY INFO: signal count 409
RW-shared spins 55, rounds 106, OS waits 51
RW-excl spins 207, rounds 1482, OS waits 22
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 1.93 RW-shared, 7.16 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 10355
Purge done for trx's n:o < 10354 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421778294131304, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421778294130432, 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
1602 OS file reads, 3684 OS file writes, 990 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 1 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)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
234.75 hash searches/s, 116.65 non-hash searches/s
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LOG
---
Log sequence number          52074571
Log buffer assigned up to    52074571
Log buffer completed up to   52074571
Log written up to            52074571
Log flushed up to            52074571
Added dirty pages up to      52074571
Pages flushed up to          52074571
Last checkpoint at           52074571
1419 log i/o's done, 0.00 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 462754
Buffer pool size   8192
Free buffers       6577
Database pages     1593
Old database pages 568
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 369, not young 303
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1435, created 249, written 2046
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: 1593, unzip_LRU len: 0
I/O sum[365]: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=361, Main thread ID=140302809757440 , state=sleeping
Number of rows inserted 16443, updated 1803, deleted 1534, read 411569
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 322.08 reads/s
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END OF INNODB MONITOR OUTPUT
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