Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-09-12 05:00:22 0x8ec INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 18 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 407744 srv_active, 0 srv_shutdown, 853964 srv_idle
srv_master_thread log flush and writes: 1261708
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 635659
OS WAIT ARRAY INFO: signal count 609777
RW-shared spins 597071, rounds 14649490, OS waits 465425
RW-excl spins 356242, rounds 536248, OS waits 2503
RW-sx spins 637, rounds 12596, OS waits 315
Spin rounds per wait: 24.54 RW-shared, 1.51 RW-excl, 19.77 RW-sx
------------------------
LATEST DETECTED DEADLOCK
------------------------
2025-08-28 09:34:21 0x1694
*** (1) TRANSACTION:
TRANSACTION 1272553, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
LOCK WAIT 4 lock struct(s), heap size 1128, 2 row lock(s), undo log entries 1
MySQL thread id 39, OS thread handle 4748, query id 1791 localhost ::1 blog1 Update
INSERT INTO `rce_blogoptions` (`option_name`, `option_value`, `autoload`) VALUES ('_site_transient_timeout_wp_theme_files_patterns-0a7a016d5e227886def40dc10d12de93', '1756355661', 'off') ON DUPLICATE KEY UPDATE `option_name` = VALUES(`option_name`), `option_value` = VALUES(`option_value`), `autoload` = VALUES(`autoload`)
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 1315 page no 27 n bits 384 index option_name of table `rce_blog1`.`rce_blogoptions` trx id 1272553 lock_mode X locks gap before rec insert intention waiting
Record lock, heap no 18 PHYSICAL RECORD: n_fields 2; compact format; info bits 0
 0: len 30; hex 5f736974655f7472616e7369656e745f74696d656f75745f77705f746865; asc _site_transient_timeout_wp_the; (total 80 bytes);
 1: len 8; hex 000000000007c0fc; asc         ;;

*** (2) TRANSACTION:
TRANSACTION 1272558, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
4 lock struct(s), heap size 1128, 3 row lock(s), undo log entries 1
MySQL thread id 38, OS thread handle 5780, query id 1796 localhost ::1 blog1 Update
INSERT INTO `rce_blogoptions` (`option_name`, `option_value`, `autoload`) VALUES ('_site_transient_timeout_wp_theme_files_patterns-0a7a016d5e227886def40dc10d12de93', '1756355661', 'off') ON DUPLICATE KEY UPDATE `option_name` = VALUES(`option_name`), `option_value` = VALUES(`option_value`), `autoload` = VALUES(`autoload`)
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 1315 page no 27 n bits 384 index option_name of table `rce_blog1`.`rce_blogoptions` trx id 1272558 lock_mode X
Record lock, heap no 18 PHYSICAL RECORD: n_fields 2; compact format; info bits 0
 0: len 30; hex 5f736974655f7472616e7369656e745f74696d656f75745f77705f746865; asc _site_transient_timeout_wp_the; (total 80 bytes);
 1: len 8; hex 000000000007c0fc; asc         ;;

*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 1315 page no 27 n bits 384 index option_name of table `rce_blog1`.`rce_blogoptions` trx id 1272558 lock_mode X locks gap before rec insert intention waiting
Record lock, heap no 18 PHYSICAL RECORD: n_fields 2; compact format; info bits 0
 0: len 30; hex 5f736974655f7472616e7369656e745f74696d656f75745f77705f746865; asc _site_transient_timeout_wp_the; (total 80 bytes);
 1: len 8; hex 000000000007c0fc; asc         ;;

*** WE ROLL BACK TRANSACTION (2)
------------
TRANSACTIONS
------------
Trx id counter 2620555
Purge done for trx's n:o < 2620555 undo n:o < 0 state: running
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283312581657080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283312581652912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283312581640408, ACTIVE 0 sec fetching rows
mysql tables in use 2, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
MySQL thread id 1333736, OS thread handle 2968, query id 73462200 localhost 127.0.0.1 root Sending data
SELECT * FROM `rce_blogwsm_hourwisefirstvisitors` LIMIT 0, 25
Trx read view will not see trx with id >= 2620555, sees < 2620555
---TRANSACTION 283312581636240, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283312581648744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283312581644576, 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
38530373 OS file reads, 5420487 OS file writes, 3384747 OS fsyncs
25.67 reads/s, 16384 avg bytes/read, 12.72 writes/s, 6.50 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 192, seg size 194, 281 merges
merged operations:
 insert 0, delete mark 732, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 2 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 4 buffer(s)
Hash table size 4441, node heap has 14 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)
546.25 hash searches/s, 108.27 non-hash searches/s
---
LOG
---
Log sequence number 3766252329
Log flushed up to   3766252309
Pages flushed up to 3766248228
Last checkpoint at  3766227917
0 pending log flushes, 0 pending chkp writes
1955192 log i/o's done, 3.39 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1287056
Buffer pool size   1003
Free buffers       608
Database pages     370
Old database pages 0
Modified db pages  7
Percent of dirty pages(LRU & free pages): 0.715
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 16373770, not young 835993816
0.00 youngs/s, 0.00 non-youngs/s
Pages read 38529854, created 29133, written 2960077
25.67 reads/s, 0.06 creates/s, 8.00 writes/s
Buffer pool hit rate 988 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.17/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 370, unzip_LRU len: 0
I/O sum[1161]:cur[115], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Process ID=2932, Main thread ID=4640, state: sleeping
Number of rows inserted 156953, updated 582527, deleted 6287, read 12779032376
0.00 inserts/s, 2.00 updates/s, 0.00 deletes/s, 1887.23 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2641515
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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