Storage engines

InnoDB

Supports transactions, row-level locking, foreign keys and encryption for tables

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-01 13:18:04 0x7fecd858a700 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: 4607 srv_active, 0 srv_shutdown, 1718 srv_idle
srv_master_thread log flush and writes: 6325
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 10788
OS WAIT ARRAY INFO: signal count 9014
RW-shared spins 0, rounds 3749, OS waits 1866
RW-excl spins 0, rounds 2217, OS waits 74
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 3749.00 RW-shared, 2217.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 55107
Purge done for trx's n:o < 55107 undo n:o < 0 state: running but idle
History list length 16
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422130200969880, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422130200961368, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422130200965624, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422130200957112, 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
765 OS file reads, 58367 OS file writes, 29828 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 7.30 writes/s, 5.00 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 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 4 buffer(s)
Hash table size 69257, node heap has 2 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 3 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
5.10 hash searches/s, 0.40 non-hash searches/s
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LOG
---
Log sequence number 20564795
Log flushed up to   20564674
Pages flushed up to 20564294
Last checkpoint at  20560272
0 pending log flushes, 0 pending chkp writes
17284 log i/o's done, 3.00 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 128256
Buffer pool size   16024
Free buffers       15260
Database pages     752
Old database pages 292
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.019
Max dirty pages percent: 75.000
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 606, created 146, written 36401
0.00 reads/s, 0.00 creates/s, 3.60 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: 752, 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=903, Main thread ID=140654449510144, state: sleeping
Number of rows inserted 1, updated 8698, deleted 0, read 456639
0.00 inserts/s, 1.30 updates/s, 0.00 deletes/s, 2.70 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 289
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
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END OF INNODB MONITOR OUTPUT
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