Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-02-01 21:34:12 0x1fac INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 4 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 222787 srv_active, 0 srv_shutdown, 1706 srv_idle
srv_master_thread log flush and writes: 224493
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 55934
OS WAIT ARRAY INFO: signal count 251717
RW-shared spins 526350, rounds 2039091, OS waits 35616
RW-excl spins 375824, rounds 881558, OS waits 2227
RW-sx spins 89380, rounds 474045, OS waits 918
Spin rounds per wait: 3.87 RW-shared, 2.35 RW-excl, 5.30 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 17213947
Purge done for trx's n:o < 17213947 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283229401408856, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401404688, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401396352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401400520, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401392184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401379680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401388016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401375512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401371344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401363008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401383848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401367176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401338000, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401342168, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401358840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401350504, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401346336, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401354672, 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
51096 OS file reads, 1839832 OS file writes, 1011918 OS fsyncs
4.75 reads/s, 16384 avg bytes/read, 8.25 writes/s, 7.25 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 11, seg size 13, 307 merges
merged operations:
 insert 8362, delete mark 7764, delete 6368
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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 4 buffer(s)
Hash table size 4441, node heap has 4 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
43.74 hash searches/s, 62.48 non-hash searches/s
---
LOG
---
Log sequence number 176083153022
Log flushed up to   176083153002
Pages flushed up to 176083079869
Last checkpoint at  176083066321
0 pending log flushes, 0 pending chkp writes
308695 log i/o's done, 5.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 167768
Buffer pool size   1003
Free buffers       726
Database pages     263
Old database pages 0
Modified db pages  44
Percent of dirty pages(LRU & free pages): 4.444
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 51017, created 15195, written 1221590
4.75 reads/s, 0.00 creates/s, 2.25 writes/s
Buffer pool hit rate 989 / 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: 263, unzip_LRU len: 0
I/O sum[364]:cur[13], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=11752, Main thread ID=6096, state: sleeping
Number of rows inserted 258520, updated 1448756, deleted 258457, read 65485080
0.00 inserts/s, 8.00 updates/s, 0.00 deletes/s, 171.96 reads/s
Number of system rows inserted 1, updated 0, deleted 0, read 3567
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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