Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-28 10:16:54 0x1568 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 56 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 225870 srv_active, 0 srv_shutdown, 4308174 srv_idle
srv_master_thread log flush and writes: 4534044
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 10119764
OS WAIT ARRAY INFO: signal count 2202024
RW-shared spins 1003753, rounds 14979353, OS waits 428597
RW-excl spins 899348, rounds 4525771, OS waits 22616
RW-sx spins 18812, rounds 436164, OS waits 9063
Spin rounds per wait: 14.92 RW-shared, 5.03 RW-excl, 23.19 RW-sx
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TRANSACTIONS
------------
Trx id counter 4650552
Purge done for trx's n:o < 4650552 undo n:o < 0 state: running
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283371855425896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855455072, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855450904, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855446736, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855421728, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855417560, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855413392, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855442568, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855438400, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855434232, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855430064, 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
33654257 OS file reads, 7184598 OS file writes, 2895094 OS fsyncs
9.89 reads/s, 16384 avg bytes/read, 11.87 writes/s, 6.20 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 35, seg size 37, 42231 merges
merged operations:
 insert 74792, delete mark 29445, delete 6142
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 0 buffer(s)
27.46 hash searches/s, 39.68 non-hash searches/s
---
LOG
---
Log sequence number 27480665136
Log flushed up to   27480665136
Pages flushed up to 27480632078
Last checkpoint at  27480629325
0 pending log flushes, 0 pending chkp writes
1558525 log i/o's done, 3.95 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1565000
Buffer pool size   1003
Free buffers       735
Database pages     261
Old database pages 0
Modified db pages  121
Percent of dirty pages(LRU & free pages): 12.136
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 2199599, not young 143047086
0.00 youngs/s, 0.00 non-youngs/s
Pages read 33653852, created 566620, written 5155495
9.89 reads/s, 0.23 creates/s, 6.89 writes/s
Buffer pool hit rate 948 / 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: 261, unzip_LRU len: 0
I/O sum[733]:cur[9], 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=17232, Main thread ID=9312, state: sleeping
Number of rows inserted 2417694, updated 793637, deleted 136853, read 1191983790
0.02 inserts/s, 2.95 updates/s, 0.02 deletes/s, 288.66 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 970235
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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