Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-04 02:41:40 0x2520 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 15 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 270 srv_active, 0 srv_shutdown, 145454 srv_idle
srv_master_thread log flush and writes: 145724
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 868
OS WAIT ARRAY INFO: signal count 610
RW-shared spins 227, rounds 6542, OS waits 215
RW-excl spins 76, rounds 389, OS waits 7
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 28.82 RW-shared, 5.12 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 43062
Purge done for trx's n:o < 43062 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284195745448168, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284195745443992, 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
2888 OS file reads, 5963 OS file writes, 2760 OS fsyncs
3.13 reads/s, 16384 avg bytes/read, 6.60 writes/s, 3.33 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 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
5.53 hash searches/s, 15.93 non-hash searches/s
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LOG
---
Log sequence number 21096286
Log flushed up to   21096286
Pages flushed up to 21096286
Last checkpoint at  21078780
0 pending log flushes, 0 pending chkp writes
1820 log i/o's done, 2.13 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 215344
Buffer pool size   1003
Free buffers       742
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2799, created 161, written 3783
3.13 reads/s, 0.00 creates/s, 3.93 writes/s
Buffer pool hit rate 952 / 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[312]: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=5396, Main thread ID=7328, state: sleeping
Number of rows inserted 35, updated 1058, deleted 0, read 1184154
0.00 inserts/s, 1.27 updates/s, 0.00 deletes/s, 8.07 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1539
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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