Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-28 01:39:34 0x7f31c0092700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 57 srv_active, 0 srv_shutdown, 469 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 143
OS WAIT ARRAY INFO: signal count 144
RW-shared spins 6, rounds 11, OS waits 5
RW-excl spins 11, rounds 331, OS waits 12
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.83 RW-shared, 30.09 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10192
Purge done for trx's n:o < 10191 undo n:o < 0 state: running but idle
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421326636198768, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421326636197896, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421326636197024, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421326636196152, not started flushing log
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421326636194408, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421326636193536, 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
1877 OS file reads, 2202 OS file writes, 741 OS fsyncs
0.03 reads/s, 16384 avg bytes/read, 4.21 writes/s, 0.54 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 1 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 1 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
5500.91 hash searches/s, 3896.49 non-hash searches/s
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LOG
---
Log sequence number          51207143
Log buffer assigned up to    51207143
Log buffer completed up to   51207143
Log written up to            51207143
Log flushed up to            51207143
Added dirty pages up to      51206804
Pages flushed up to          51206804
Last checkpoint at           51206804
581 log i/o's done, 0.31 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 906214
Buffer pool size   8192
Free buffers       6274
Database pages     1899
Old database pages 712
Modified db pages  3
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 522, not young 6072
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1714, created 554, written 1274
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: 1899, unzip_LRU len: 0
I/O sum[192]: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=139851150317312 , state=sleeping
Number of rows inserted 84244, updated 643, deleted 0, read 2623155
235.58 inserts/s, 0.15 updates/s, 0.00 deletes/s, 7069.28 reads/s
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END OF INNODB MONITOR OUTPUT
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