Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-11-10 21:01:14 0x2178 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 11 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 53399 srv_active, 0 srv_shutdown, 208849 srv_idle
srv_master_thread log flush and writes: 262248
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1732337
OS WAIT ARRAY INFO: signal count 162248
RW-shared spins 36191, rounds 1076998, OS waits 34534
RW-excl spins 674, rounds 12991, OS waits 305
RW-sx spins 4, rounds 120, OS waits 3
Spin rounds per wait: 29.76 RW-shared, 19.27 RW-excl, 30.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 9411954
Purge done for trx's n:o < 9411952 undo n:o < 0 state: running
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284042686653352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686649184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686645016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686632512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686628344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686624176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686620008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686615840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686611672, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686607504, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686640848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284042686636680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
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
110232 OS file reads, 672031 OS file writes, 397437 OS fsyncs
0.64 reads/s, 16384 avg bytes/read, 0.91 writes/s, 0.64 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
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 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)
5.54 hash searches/s, 10.09 non-hash searches/s
---
LOG
---
Log sequence number 5130447693
Log flushed up to   5130447693
Pages flushed up to 5130446592
Last checkpoint at  5130444253
0 pending log flushes, 0 pending chkp writes
221173 log i/o's done, 0.36 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 395632
Buffer pool size   1003
Free buffers       736
Database pages     259
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.301
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 71, not young 1863
0.00 youngs/s, 0.00 non-youngs/s
Pages read 110070, created 5282, written 385742
0.64 reads/s, 0.00 creates/s, 0.45 writes/s
Buffer pool hit rate 974 / 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: 259, unzip_LRU len: 0
I/O sum[4]:cur[8], 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=16204, Main thread ID=14112, state: sleeping
Number of rows inserted 169, updated 95766, deleted 145, read 1569583
0.00 inserts/s, 0.27 updates/s, 0.00 deletes/s, 6.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 126791
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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