Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-21 18:41:23 0x1e2c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 10 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 145 srv_active, 0 srv_shutdown, 32819 srv_idle
srv_master_thread log flush and writes: 32964
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 7042
OS WAIT ARRAY INFO: signal count 426
RW-shared spins 531, rounds 15509, OS waits 394
RW-excl spins 36, rounds 530, OS waits 12
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.21 RW-shared, 14.72 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 1611133
Purge done for trx's n:o < 1611133 undo n:o < 0 state: running
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283548073779416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283548073775248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283548073787752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283548073783584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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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
10409 OS file reads, 2486 OS file writes, 1254 OS fsyncs
6.50 reads/s, 16384 avg bytes/read, 16.20 writes/s, 6.10 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 26, seg size 28, 16 merges
merged operations:
 insert 25, delete mark 36, delete 18
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 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)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
12.60 hash searches/s, 36.80 non-hash searches/s
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LOG
---
Log sequence number 2197805785
Log flushed up to   2197805785
Pages flushed up to 2197793096
Last checkpoint at  2197784184
0 pending log flushes, 0 pending chkp writes
749 log i/o's done, 3.40 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1797872
Buffer pool size   1003
Free buffers       783
Database pages     213
Old database pages 0
Modified db pages  69
Percent of dirty pages(LRU & free pages): 6.921
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 192, not young 26280
0.00 youngs/s, 0.00 non-youngs/s
Pages read 9688, created 146, written 1565
6.50 reads/s, 0.00 creates/s, 11.80 writes/s
Buffer pool hit rate 947 / 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: 213, unzip_LRU len: 0
I/O sum[315]:cur[13], 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=2908, Main thread ID=4720, state: sleeping
Number of rows inserted 35, updated 238, deleted 35, read 170559
0.00 inserts/s, 2.90 updates/s, 0.00 deletes/s, 12.40 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 48758
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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