Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-05 22:33:30 0x189c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 34 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 3179 srv_active, 0 srv_shutdown, 5385 srv_idle
srv_master_thread log flush and writes: 8564
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 51702
OS WAIT ARRAY INFO: signal count 6200
RW-shared spins 1908, rounds 52494, OS waits 1678
RW-excl spins 747, rounds 7163, OS waits 159
RW-sx spins 3, rounds 90, OS waits 3
Spin rounds per wait: 27.51 RW-shared, 9.59 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 8164
Purge done for trx's n:o < 8164 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283071172690496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172686328, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172682160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172677992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172673824, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172669656, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283071172665488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
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
7484 OS file reads, 31850 OS file writes, 19536 OS fsyncs
2.12 reads/s, 16384 avg bytes/read, 5.94 writes/s, 3.91 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
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 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 0 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)
5.91 hash searches/s, 13.76 non-hash searches/s
---
LOG
---
Log sequence number 5452129
Log flushed up to   5452129
Pages flushed up to 5452129
Last checkpoint at  5452120
0 pending log flushes, 0 pending chkp writes
9863 log i/o's done, 2.24 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 120192
Buffer pool size   1003
Free buffers       739
Database pages     258
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 7448, created 384, written 18653
2.12 reads/s, 0.00 creates/s, 3.03 writes/s
Buffer pool hit rate 958 / 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: 258, unzip_LRU len: 0
I/O sum[291]: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=2216, Main thread ID=5740, state: sleeping
Number of rows inserted 111, updated 3768, deleted 4, read 30411
0.00 inserts/s, 0.85 updates/s, 0.00 deletes/s, 6.74 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5678
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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