Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-31 02:05:23 0x3930 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 48 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 13587 srv_active, 0 srv_shutdown, 2080401 srv_idle
srv_master_thread log flush and writes: 2093988
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 706625
OS WAIT ARRAY INFO: signal count 265623
RW-shared spins 110106, rounds 1680209, OS waits 34485
RW-excl spins 68523, rounds 834665, OS waits 10293
RW-sx spins 32983, rounds 475762, OS waits 7585
Spin rounds per wait: 15.26 RW-shared, 12.18 RW-excl, 14.42 RW-sx
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TRANSACTIONS
------------
Trx id counter 392241
Purge done for trx's n:o < 392241 undo n:o < 0 state: running
History list length 15
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284046279827672, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279823504, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279831840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279869352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279865184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279861016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279856848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279848512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279840176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284046279836008, 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
1224750 OS file reads, 1181265 OS file writes, 341124 OS fsyncs
1.90 reads/s, 16384 avg bytes/read, 8.00 writes/s, 5.10 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 299, seg size 301, 3332 merges
merged operations:
 insert 58690, delete mark 288153, delete 1017
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)
5.44 hash searches/s, 14.08 non-hash searches/s
---
LOG
---
Log sequence number 159470312
Log flushed up to   159470312
Pages flushed up to 159462439
Last checkpoint at  159459905
0 pending log flushes, 0 pending chkp writes
248670 log i/o's done, 2.58 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 155248
Buffer pool size   1003
Free buffers       733
Database pages     262
Old database pages 0
Modified db pages  16
Percent of dirty pages(LRU & free pages): 1.606
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1868, not young 414883
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1224692, created 5597, written 897510
1.90 reads/s, 0.06 creates/s, 4.48 writes/s
Buffer pool hit rate 964 / 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[303]:cur[13], 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=5804, Main thread ID=2984, state: sleeping
Number of rows inserted 177582, updated 14177, deleted 177007, read 6189081
0.00 inserts/s, 1.12 updates/s, 0.00 deletes/s, 13.92 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 10778
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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