Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-28 18:38:27 0x1d50 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 20 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 3951 srv_active, 0 srv_shutdown, 597556 srv_idle
srv_master_thread log flush and writes: 601507
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 170013
OS WAIT ARRAY INFO: signal count 110918
RW-shared spins 0, rounds 198893, OS waits 83082
RW-excl spins 0, rounds 1026092, OS waits 1445
RW-sx spins 3, rounds 90, OS waits 3
Spin rounds per wait: 198893.00 RW-shared, 1026092.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 999387
Purge done for trx's n:o < 999387 undo n:o < 0 state: running
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283707283100680, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283707283096464, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283707283092248, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283707283088032, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283707283083816, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283707283079600, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283707283075384, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283707283071168, not started
0 lock struct(s), heap size 1136, 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
17979106 OS file reads, 66484 OS file writes, 38130 OS fsyncs
341.83 reads/s, 16384 avg bytes/read, 1.15 writes/s, 0.90 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
2.35 hash searches/s, 17.55 non-hash searches/s
---
LOG
---
Log sequence number 1370574547
Log flushed up to   1370574527
Pages flushed up to 1370572325
Last checkpoint at  1370570004
0 pending log flushes, 0 pending chkp writes
24069 log i/o's done, 0.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 199584
Buffer pool size   1002
Free buffers       739
Database pages     260
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.500
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 418442, not young 110847176
0.00 youngs/s, 2043.30 non-youngs/s
Pages read 17979029, created 496, written 36678
341.83 reads/s, 0.00 creates/s, 0.50 writes/s
Buffer pool hit rate 878 / 1000, young-making rate 0 / 1000 not 728 / 1000
Pages read ahead 230.34/s, evicted without access 0.50/s, Random read ahead 0.00/s
LRU len: 260, unzip_LRU len: 0
I/O sum[2382]:cur[2], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=3220, Main thread ID=5008, state: sleeping
Number of rows inserted 1256, updated 8258, deleted 65, read 1032950067
0.00 inserts/s, 0.30 updates/s, 0.00 deletes/s, 18621.97 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5775
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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