Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-02-01 21:22:20 0x1b98 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 13 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 222098 srv_active, 0 srv_shutdown, 1692 srv_idle
srv_master_thread log flush and writes: 223790
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 55706
OS WAIT ARRAY INFO: signal count 250117
RW-shared spins 522938, rounds 2027991, OS waits 35493
RW-excl spins 373301, rounds 875875, OS waits 2224
RW-sx spins 88525, rounds 469395, OS waits 911
Spin rounds per wait: 3.88 RW-shared, 2.35 RW-excl, 5.30 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 17212979
Purge done for trx's n:o < 17212979 undo n:o < 0 state: running
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283229401404688, 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 283229401396352, ACTIVE 0 sec starting index read
mysql tables in use 1, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
MySQL thread id 7170, OS thread handle 9572, query id 9036068 localhost 127.0.0.1 pma Statistics
SELECT `tables` FROM `phpmyadmin`.`pma__recent` WHERE `username` = 'root'
Trx read view will not see trx with id >= 17212979, sees < 17212979
---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
50506 OS file reads, 1834060 OS file writes, 1008897 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 8.08 writes/s, 5.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 11, seg size 13, 304 merges
merged operations:
 insert 8309, delete mark 7711, delete 6316
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 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)
14.77 hash searches/s, 1.85 non-hash searches/s
---
LOG
---
Log sequence number 176069833328
Log flushed up to   176069833328
Pages flushed up to 176069781925
Last checkpoint at  176069760069
0 pending log flushes, 0 pending chkp writes
307636 log i/o's done, 1.23 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 167768
Buffer pool size   1003
Free buffers       740
Database pages     256
Old database pages 0
Modified db pages  11
Percent of dirty pages(LRU & free pages): 1.103
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 50427, created 15070, written 1217736
0.00 reads/s, 0.00 creates/s, 5.08 writes/s
Buffer pool hit rate 1000 / 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: 256, unzip_LRU len: 0
I/O sum[290]:cur[1], 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 256467, updated 1445842, deleted 256404, read 65354852
0.00 inserts/s, 3.69 updates/s, 0.00 deletes/s, 161.37 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
============================