Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-14 05:28:06 0x4fa4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 33 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 18012 srv_active, 0 srv_shutdown, 365416 srv_idle
srv_master_thread log flush and writes: 383428
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 697941
OS WAIT ARRAY INFO: signal count 350226
RW-shared spins 462126, rounds 13094606, OS waits 326508
RW-excl spins 533310, rounds 2121360, OS waits 3574
RW-sx spins 2, rounds 60, OS waits 2
Spin rounds per wait: 28.34 RW-shared, 3.98 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 8089951
Purge done for trx's n:o < 8089951 undo n:o < 0 state: running
History list length 10
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283913646952592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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I/O thread 0 state: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
43306916 OS file reads, 430055 OS file writes, 217623 OS fsyncs
487.99 reads/s, 16384 avg bytes/read, 1.18 writes/s, 0.73 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, 5 merges
merged operations:
 insert 5, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
58.57 hash searches/s, 11.76 non-hash searches/s
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LOG
---
Log sequence number 1860414833
Log flushed up to   1860414833
Pages flushed up to 1860414833
Last checkpoint at  1860414749
0 pending log flushes, 0 pending chkp writes
130898 log i/o's done, 0.39 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 180288
Buffer pool size   1003
Free buffers       748
Database pages     248
Old database pages 0
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 411869, not young 1626783056
7.00 youngs/s, 18814.85 non-youngs/s
Pages read 43306842, created 993, written 277845
487.99 reads/s, 0.00 creates/s, 0.70 writes/s
Buffer pool hit rate 976 / 1000, young-making rate 0 / 1000 not 922 / 1000
Pages read ahead 435.68/s, evicted without access 19.61/s, Random read ahead 0.00/s
LRU len: 248, unzip_LRU len: 0
I/O sum[2259]: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=4540, Main thread ID=6640, state: sleeping
Number of rows inserted 43790, updated 1521, deleted 0, read 15194426171
0.15 inserts/s, 0.00 updates/s, 0.00 deletes/s, 173099.15 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 13067
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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