Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-29 20:39:28 0x8fc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 50 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 1776 srv_active, 0 srv_shutdown, 2397870 srv_idle
srv_master_thread log flush and writes: 2399646
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 37907
OS WAIT ARRAY INFO: signal count 12647
RW-shared spins 2898, rounds 84646, OS waits 2807
RW-excl spins 1121, rounds 10567, OS waits 198
RW-sx spins 5, rounds 150, OS waits 5
Spin rounds per wait: 29.21 RW-shared, 9.43 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 139892
Purge done for trx's n:o < 139892 undo n:o < 0 state: running
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282388424609936, 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
15499 OS file reads, 23042 OS file writes, 13260 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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, 157 merges
merged operations:
 insert 157, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 2 buffer(s)
Hash table size 4441, node heap has 2 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)
0.00 hash searches/s, 0.00 non-hash searches/s
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LOG
---
Log sequence number 84260053
Log flushed up to   84260053
Pages flushed up to 84260053
Last checkpoint at  84260044
0 pending log flushes, 0 pending chkp writes
8450 log i/o's done, 0.00 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 212840
Buffer pool size   1003
Free buffers       737
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 291, not young 605
0.00 youngs/s, 0.00 non-youngs/s
Pages read 15413, created 264, written 13039
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
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[0]: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=2356, Main thread ID=2960, state: sleeping
Number of rows inserted 1244, updated 480, deleted 206, read 17575623
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 52488
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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