Issues with alter table InnoDB (1 reply)
System-specs: -- MySQL Version 9.10 Distrib 5.5.60 -- CentOS Linux release 7.5.1804 (Core) -- innodb_file_per_table Problem: table status of some innodb tables shows "data_free=4194304". optimize...
View ArticleTransaction Deadlock Fixed with Composite Index - but why? (3 replies)
I encountered a transaction deadlock issue that occurred when two transactions were both trying to do a large set of UPDATEs. Each individual UPDATE in each transaction was only for a unique row so...
View ArticleDELETE from table does not delete rows (2 replies)
Hi, I ran into a very strange situation: a cron job runs every night and is supposed to delete form old data from a table. It turns out that for a few weeks now the query runs, takes a lot of time (as...
View ArticleRunning queries across different shards in Mysql 8 (no replies)
Hi, I have an application where I will definitely to shard. We are collecting gps location of vehicles every 10 seconds. Thus we cant run on a single machine for few thousand vehicles. Thus we could...
View ArticleError column longtext (1 reply)
Hi everyone, I have an innodb table with about 25 longtext fields, but during data entry I get the Row size too large error (> 8126). The error is resolved if I use myisam for the table, but I...
View Articlehelp with recommending hardware for mysql db running innodb engine (no replies)
I have a moderate to high busy mysql database server (in terms of read and writes). We are having some performance issues. Trying to figure out where might be the bottlenecks. Database definitely has...
View ArticleVIEWS WITH PARAMETERS (no replies)
This is a simple solution to improve the problem of slow VIEWS with multiple joins queries between multiple tables. DELIMITER ;; CREATE PROCEDURE `SP_QUERY_VIEW_WITH_PARAMETERS`(IN p_having...
View Articlequery by first occurrence in group (5 replies)
With a table with 2 fields as: sector, number, matriculate doct 2 A doct 5 B doct 5 C info 0 D info 1 E info 4 F info 4 G tech 2 H tech 3 I I want extract for every sector, which has maximum "number",...
View Articlerisk for innodb_flush_method=nosync (5 replies)
Hi, The msqld on my Linux is busy with hight disk overhead. So I want to know, can I use innodb_flush_method=nosync to descrease disk overhead. I have replication for mysqld on the other Linux without...
View Articlemysql 5.6.26 high concurrency dead lock (3 replies)
table struce: CREATE TABLE `extend_0` ( `id` bigint(20) NOT NULL, `code` varchar(30) NOT NULL, `data_key` varchar(50) NOT NULL, `data_value` varchar(200) NOT NULL, `create_time` timestamp NOT NULL...
View ArticleSQLSTATE[42000]: Syntax error or access violation: 1070 Too many key parts...
I'm getting SQLSTATE[42000]: Syntax error or access violation: 1070 Too many key parts specified; max 16 parts allowed for the below given query, please let me know how to solve this error. CREATE...
View ArticleInnoDB field type size vs file size descrepency? (1 reply)
I created these tables: create table aca (money TINYINT); create table acb (money SMALLINT); create table acc (money INT); create table acd (money BIGINT); I ran the following inserts over and over to...
View ArticleHow to show hideen column values about MVCC? (no replies)
Hello, After I build mysql with debug, I can query them by modifying the hidden columns of DB_TRX_ID and DB_ROLL_PTR in mysql.columns, but the value of these columns is always 0, may I ask how I can...
View Article에이플러스바카라추천 -二 785YES。COM 二- 에이플러스바카라게임 (no replies)
에이플러스바카라추천 -二 785YES。COM 二- 에이플러스바카라게임 에이플러스바카라추천 -二 785YES。COM 二- 에이플러스바카라게임 에이플러스바카라추천 -二 785YES。COM 二- 에이플러스바카라게임 에이플러스바카라추천 -二 785YES。COM 二- 에이플러스바카라게임 에이플러스바카라추천 -二 785YES。COM 二- 에이플러스바카라게임...
View Article플러스바카라추천 -二 785YES。COM 二- 플러스바카라게임 (no replies)
플러스바카라추천 -二 785YES。COM 二- 플러스바카라게임 플러스바카라추천 -二 785YES。COM 二- 플러스바카라게임 플러스바카라추천 -二 785YES。COM 二- 플러스바카라게임 플러스바카라추천 -二 785YES。COM 二- 플러스바카라게임 플러스바카라추천 -二 785YES。COM 二- 플러스바카라게임 플러스바카라추천 -二 785YES。COM 二-...
View Article월드바카라추천 -二 785YES。COM 二- 월드바카라게임 (no replies)
월드바카라추천 -二 785YES。COM 二- 월드바카라게임 월드바카라추천 -二 785YES。COM 二- 월드바카라게임 월드바카라추천 -二 785YES。COM 二- 월드바카라게임 월드바카라추천 -二 785YES。COM 二- 월드바카라게임 월드바카라추천 -二 785YES。COM 二- 월드바카라게임 월드바카라추천 -二 785YES。COM 二- 월드바카라게임...
View Articlewhat are main differance. (no replies)
what are main differance between in MYISAM storage engine and InnoDB storage engine.
View ArticleInsert to InnoDB table stops after about 40,000 rows (2 replies)
Hi, I have MySQL Enterprise version 8.11. I tried many times to insert data to a table but each time it stops inserting any rows after about 40,000 rows have been inserted. There are about 15,872,844...
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