Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-05-31 02:14:32 0x3dc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 19 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 388 srv_active, 0 srv_shutdown, 307258 srv_idle
srv_master_thread log flush and writes: 307646
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 17856
OS WAIT ARRAY INFO: signal count 2302
RW-shared spins 1355, rounds 38042, OS waits 1238
RW-excl spins 1041, rounds 3977, OS waits 46
RW-sx spins 8, rounds 101, OS waits 2
Spin rounds per wait: 28.08 RW-shared, 3.82 RW-excl, 12.63 RW-sx
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TRANSACTIONS
------------
Trx id counter 274291
Purge done for trx's n:o < 274289 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283482281669040, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281694048, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281689880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281685712, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281681544, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281677376, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281673208, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281664872, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281660704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281656536, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283482281652368, not started
0 lock struct(s), heap size 1128, 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
7092 OS file reads, 11574 OS file writes, 5324 OS fsyncs
6.89 reads/s, 16384 avg bytes/read, 7.05 writes/s, 2.68 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 4 merges
merged operations:
 insert 4, 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 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 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)
15.58 hash searches/s, 37.58 non-hash searches/s
---
LOG
---
Log sequence number 16774500
Log flushed up to   16774500
Pages flushed up to 16772502
Last checkpoint at  16772493
0 pending log flushes, 0 pending chkp writes
3371 log i/o's done, 1.84 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 257912
Buffer pool size   1003
Free buffers       732
Database pages     262
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.503
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 6993, created 314, written 7613
6.89 reads/s, 0.00 creates/s, 4.89 writes/s
Buffer pool hit rate 941 / 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[374]:cur[6], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=3288, Main thread ID=4664, state: sleeping
Number of rows inserted 520, updated 556, deleted 200, read 493049
0.00 inserts/s, 1.32 updates/s, 0.00 deletes/s, 49.94 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2717
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 47.63 reads/s
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END OF INNODB MONITOR OUTPUT
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