Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-03-28 08:48:50 0xe5c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 18 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 224361 srv_active, 0 srv_shutdown, 4304493 srv_idle
srv_master_thread log flush and writes: 4528854
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 10058812
OS WAIT ARRAY INFO: signal count 2194291
RW-shared spins 1002400, rounds 14941821, OS waits 427633
RW-excl spins 899137, rounds 4524190, OS waits 22595
RW-sx spins 18812, rounds 436164, OS waits 9063
Spin rounds per wait: 14.91 RW-shared, 5.03 RW-excl, 23.19 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 4642165
Purge done for trx's n:o < 4642165 undo n:o < 0 state: running
History list length 29
LIST OF TRANSACTIONS FOR EACH SESSION:
---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 283371855430064, 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 283371855425896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855459240, 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 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)
--------
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
33577221 OS file reads, 7159738 OS file writes, 2882081 OS fsyncs
13.39 reads/s, 16384 avg bytes/read, 23.28 writes/s, 12.28 fsyncs/s
-------------------------------------
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 1 buffer(s)
40.28 hash searches/s, 69.39 non-hash searches/s
---
LOG
---
Log sequence number 27475372322
Log flushed up to   27475372302
Pages flushed up to 27475338742
Last checkpoint at  27475311050
0 pending log flushes, 0 pending chkp writes
1551016 log i/o's done, 7.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1565000
Buffer pool size   1003
Free buffers       733
Database pages     262
Old database pages 0
Modified db pages  58
Percent of dirty pages(LRU & free pages): 5.823
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 2198831, not young 142667421
0.00 youngs/s, 0.00 non-youngs/s
Pages read 33576816, created 566384, written 5140342
13.39 reads/s, 0.22 creates/s, 13.78 writes/s
Buffer pool hit rate 959 / 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[1622]:cur[15], unzip sum[0]:cur[0]
--------------
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 2417668, updated 789522, deleted 136827, read 1184983975
0.00 inserts/s, 5.94 updates/s, 0.00 deletes/s, 304.43 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
----------------------------
END OF INNODB MONITOR OUTPUT
============================