Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-04 23:57:27 0x2854 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 51 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 8953 srv_active, 0 srv_shutdown, 33306 srv_idle
srv_master_thread log flush and writes: 42259
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 21273
OS WAIT ARRAY INFO: signal count 9322
RW-shared spins 4505, rounds 127968, OS waits 4172
RW-excl spins 170, rounds 2759, OS waits 35
RW-sx spins 3, rounds 90, OS waits 1
Spin rounds per wait: 28.41 RW-shared, 16.23 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 20589
Purge done for trx's n:o < 20589 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284119691166200, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284119691162032, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284119691157864, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284119691153696, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284119691145360, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284119691174536, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284119691149528, 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
15311 OS file reads, 87827 OS file writes, 56871 OS fsyncs
0.57 reads/s, 16384 avg bytes/read, 1.00 writes/s, 0.63 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 0 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 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)
2.88 hash searches/s, 5.73 non-hash searches/s
---
LOG
---
Log sequence number 11342557
Log flushed up to   11342537
Pages flushed up to 11334073
Last checkpoint at  11326661
0 pending log flushes, 0 pending chkp writes
27497 log i/o's done, 0.43 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       735
Database pages     264
Old database pages 0
Modified db pages  36
Percent of dirty pages(LRU & free pages): 3.600
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 15275, created 460, written 50419
0.57 reads/s, 0.02 creates/s, 0.49 writes/s
Buffer pool hit rate 970 / 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: 264, unzip_LRU len: 0
I/O sum[45]:cur[9], 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=9904, Main thread ID=2628, state: sleeping
Number of rows inserted 56, updated 10063, deleted 0, read 200145
0.00 inserts/s, 0.33 updates/s, 0.00 deletes/s, 2.71 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 8945
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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