Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-29 00:28:01 0x728 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 30 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 14576 srv_active, 0 srv_shutdown, 186219 srv_idle
srv_master_thread log flush and writes: 200795
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 386604
OS WAIT ARRAY INFO: signal count 59364
RW-shared spins 4103, rounds 118090, OS waits 3109
RW-excl spins 300, rounds 7356, OS waits 188
RW-sx spins 5, rounds 136, OS waits 4
Spin rounds per wait: 28.78 RW-shared, 24.52 RW-excl, 27.20 RW-sx
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TRANSACTIONS
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Trx id counter 64479
Purge done for trx's n:o < 64479 undo n:o < 0 state: running
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283497882657272, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283497882653104, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283497882636432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283497882640600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283497882648936, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283497882644768, 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
44984 OS file reads, 193234 OS file writes, 102868 OS fsyncs
0.37 reads/s, 16384 avg bytes/read, 0.53 writes/s, 0.37 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, 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 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)
2.40 hash searches/s, 5.73 non-hash searches/s
---
LOG
---
Log sequence number 35551961
Log flushed up to   35551941
Pages flushed up to 35545671
Last checkpoint at  35541939
0 pending log flushes, 0 pending chkp writes
54413 log i/o's done, 0.27 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       738
Database pages     260
Old database pages 0
Modified db pages  13
Percent of dirty pages(LRU & free pages): 1.301
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 44948, created 1117, written 120230
0.37 reads/s, 0.00 creates/s, 0.23 writes/s
Buffer pool hit rate 973 / 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: 260, unzip_LRU len: 0
I/O sum[7]:cur[11], 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=48072, Main thread ID=22320, state: sleeping
Number of rows inserted 56, updated 31854, deleted 0, read 616223
0.00 inserts/s, 0.27 updates/s, 0.00 deletes/s, 2.50 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 25745
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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