Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-03-16 11:42:34 0x264c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 12 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 30495 srv_active, 0 srv_shutdown, 86705 srv_idle
srv_master_thread log flush and writes: 117200
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 828074
OS WAIT ARRAY INFO: signal count 57218
RW-shared spins 0, rounds 65288, OS waits 30594
RW-excl spins 0, rounds 37489, OS waits 428
RW-sx spins 371, rounds 4871, OS waits 39
Spin rounds per wait: 65288.00 RW-shared, 37489.00 RW-excl, 13.13 RW-sx
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TRANSACTIONS
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Trx id counter 1858285
Purge done for trx's n:o < 1858285 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284321760072232, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 284321760063800, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 284321760068016, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 284321760059584, 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
149741 OS file reads, 373425 OS file writes, 239286 OS fsyncs
0.17 reads/s, 16384 avg bytes/read, 3.50 writes/s, 1.58 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 23, seg size 25, 251 merges
merged operations:
 insert 1051, delete mark 483, delete 367
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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
3.58 hash searches/s, 14.08 non-hash searches/s
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LOG
---
Log sequence number 940690751
Log flushed up to   940690751
Pages flushed up to 940690751
Last checkpoint at  940690742
0 pending log flushes, 0 pending chkp writes
140620 log i/o's done, 0.92 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 531360
Buffer pool size   1002
Free buffers       739
Database pages     256
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 6883, not young 4758942
0.00 youngs/s, 0.00 non-youngs/s
Pages read 149468, created 4338, written 197732
0.17 reads/s, 0.00 creates/s, 2.33 writes/s
Buffer pool hit rate 995 / 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[115]: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=4100, Main thread ID=5268, state: sleeping
Number of rows inserted 2175, updated 44704, deleted 1060, read 609989251
0.00 inserts/s, 0.17 updates/s, 0.00 deletes/s, 4.58 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 15503
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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