Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-02 04:13:57 0x2848 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 36 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 25972 srv_active, 0 srv_shutdown, 2782248 srv_idle
srv_master_thread log flush and writes: 2808195
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 486490
OS WAIT ARRAY INFO: signal count 70658
RW-shared spins 52320, rounds 1215045, OS waits 35787
RW-excl spins 7449, rounds 117465, OS waits 3332
RW-sx spins 29, rounds 729, OS waits 16
Spin rounds per wait: 23.22 RW-shared, 15.77 RW-excl, 25.14 RW-sx
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TRANSACTIONS
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Trx id counter 145702
Purge done for trx's n:o < 145702 undo n:o < 0 state: running
History list length 36
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283466432958968, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466432950632, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466432942296, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466432938128, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466432946464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283466432954800, 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
638261 OS file reads, 425177 OS file writes, 236403 OS fsyncs
3.97 reads/s, 16384 avg bytes/read, 11.92 writes/s, 5.61 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 10871 merges
merged operations:
 insert 11433, delete mark 895, delete 5
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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
14.03 hash searches/s, 48.80 non-hash searches/s
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LOG
---
Log sequence number 238796834
Log flushed up to   238796834
Pages flushed up to 238756050
Last checkpoint at  238754583
0 pending log flushes, 0 pending chkp writes
127894 log i/o's done, 3.42 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 305488
Buffer pool size   1003
Free buffers       739
Database pages     256
Old database pages 0
Modified db pages  100
Percent of dirty pages(LRU & free pages): 10.040
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 234883, not young 126623946
0.00 youngs/s, 0.00 non-youngs/s
Pages read 638146, created 1905, written 263524
3.97 reads/s, 0.17 creates/s, 7.39 writes/s
Buffer pool hit rate 968 / 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: 256, unzip_LRU len: 0
I/O sum[648]:cur[5], 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=3436, Main thread ID=2232, state: sleeping
Number of rows inserted 15138, updated 62742, deleted 1491, read 3614158878
0.00 inserts/s, 2.86 updates/s, 0.00 deletes/s, 36.55 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 53880
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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