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 10:03:28 0x7f8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 13 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 28052 srv_active, 0 srv_shutdown, 83305 srv_idle
srv_master_thread log flush and writes: 111357
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 694719
OS WAIT ARRAY INFO: signal count 54331
RW-shared spins 0, rounds 62184, OS waits 29259
RW-excl spins 0, rounds 36348, OS waits 416
RW-sx spins 369, rounds 4811, OS waits 38
Spin rounds per wait: 62184.00 RW-shared, 36348.00 RW-excl, 13.04 RW-sx
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TRANSACTIONS
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Trx id counter 1850816
Purge done for trx's n:o < 1850816 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284321760068016, 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 284321760080664, 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
136508 OS file reads, 344275 OS file writes, 221828 OS fsyncs
1.77 reads/s, 16384 avg bytes/read, 1.85 writes/s, 1.69 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
7.23 hash searches/s, 28.46 non-hash searches/s
---
LOG
---
Log sequence number 932019294
Log flushed up to   932018755
Pages flushed up to 932002151
Last checkpoint at  932002108
0 pending log flushes, 0 pending chkp writes
130880 log i/o's done, 1.23 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       732
Database pages     262
Old database pages 0
Modified db pages  23
Percent of dirty pages(LRU & free pages): 2.312
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 6618, not young 4756345
0.00 youngs/s, 0.00 non-youngs/s
Pages read 136235, created 3985, written 181019
1.77 reads/s, 0.08 creates/s, 0.46 writes/s
Buffer pool hit rate 976 / 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: 262, unzip_LRU len: 0
I/O sum[73]:cur[8], 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 2021, updated 41269, deleted 999, read 586390305
0.00 inserts/s, 0.77 updates/s, 0.00 deletes/s, 8.69 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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