performance issue (no replies)
Hi, I have a database with size 497 GB, it continue to grow in size over time,the problem is the performance goes down with the database growth.For example, one of the tables contain 494796572 records...
View Articleinnodb_file_per_table not set,but .ibd file created individually (no replies)
Hi All, We have installed mysql 5.6.20.We didn't enable innodb_file_per_table,so as per documentation all the tables should be created inside the system tablespace(which is a expected behaviour).But...
View ArticleHow to force timeout for DriverManager.getConnection() method call ? (no...
How to force timeout for DriverManager.getConnection() method call ? I have an application which will establish DB connection with MySQL and execute queries. Sometimes the...
View Articlemyisam to innodb (no replies)
Hello, We have a db, which has many tables. db size is bigger than 100G, and some tables are myisam, some tables are innodb. The server is a virtual server, and many time we have read-only file system...
View ArticleInnoDB engine doesn't honor unique key constraints, under a heavy load (3...
I have the following table in my database. CREATE TABLE `IDN_OAUTH2_ACCESS_TOKEN` ( `ACCESS_TOKEN` varchar(255) NOT NULL DEFAULT '', `REFRESH_TOKEN` varchar(255) DEFAULT NULL, `CONSUMER_KEY`...
View Articlewhich value is good for Innodb_flush_log_at_trx_commit (1 reply)
Hi, Which value is good for Innodb_flush_log_at_trx_commit There are three values for it. (0, 1, 2) Think of Disk I/O Performance, 2 > 0 > 1 Or 0 > 2 > 1 Which value is beffer for Disk I/O...
View ArticleMySQL 5.7: Effective Functional Indexes in InnoDB (no replies)
MySQL 5.7: Effective Functional Indexes in InnoDB http://mysqlserverteam.com/json-labs-release-effective-functional-indexes-in-innodb/
View ArticleMysql DB Optimization (no replies)
Hi, After running the "Alter Table TableName Engine = InnoDb" there is no change in the reduction of size in Table_length and Index_length. Also, my Innodb_file per table is enabled. For some tables,...
View ArticleWriting new entries to database stops, unexpectedly (1 reply)
I'm using MySQL with Entity Framework, my database contains 4 tables. At the beginning everything works good, but after a month or so, when db size exceeds 40 MB (approximately 180000 rows), writing...
View Articlehow do I get consistent benchmark times with innodb buffer pool? (no replies)
The environment I work in is extremely frustrating in that I have little to no control over my testing and production environments, and they are not identical!! I have at least one query that runs...
View ArticleRestore to a test InnoDB database (no replies)
Hi, Andrew was nice enough to push me into using an InnoDB database rather than MyIsam and it has worked flawlessly ever since. He also showed me the commands below on how to backup and restore. I...
View ArticleDoes SET autocommit=0 perform table locks? (no replies)
Hello, As in the title. Does SET autocommit=0; perform table locks for other threads? I've read that START TRANSACTION; does table locks and it's very similar to autocommit=0. But I haven't found any...
View ArticleError 1067 Invalid default value (1 reply)
I just installed MySQL 5.7 on Win7 and tried to run a script (in Python) to create tables that runs fine on MySQL 5.6 on several other computers. I get a Error 1067 Invalid default value for "..." for...
View ArticleRecovering ibdata1 without a partition table (no replies)
I recently lost the partition table of a thumbdrive which was holding a virtual machine with a MySQL database running on it. Using PhotoRec, Foremost and Scalpel, I realized that these tools could...
View ArticleTriggers - History table (1 reply)
Hi all, I would like to create a single table which will be used as a history table for any inserts, updates, deletes to all other tables in the DB, without using PHP. For example. id, table, old,...
View ArticleNeed Help Restructuring Tables for Fast Data Retrieval (no replies)
I have below DB structure in MSSQL for a small application which follow relational approach. Data retrieval (for Hostels) will need several Join so looking for suggestions, may be Key-Value approach...
View ArticlePower off: The log sequence numbers in ibdata files do not match the log...
Dear friends, I'm writing here again because I get some more troubles with something like "silent data lost" in case of unproper mysql server shutdown. I'm speaking of some installation (default...
View ArticleInnodb: support for wide tables coming? (1 reply)
I notice that MYISAM supports tables with wider/larger records than innodb does. Are there plans to revise innodb so it supports records with as much data in them as MYISAM does? Those with wide...
View ArticleBegin End error 1064 (no replies)
BEGIN DECLARE @data_ini Datetime; DECLARE @data_fim Datetime; Set @data_ini = '2015-06-18 15:00:00'; Set @data_fim = '2015-06-18 16:00:00'; select * from wifiscan_km77 where (TimeStamp between...
View ArticleWhat are the risks to disabling strict mode? (no replies)
We're thinking about disabling strict mode but not sure if there are any risks. Would allowing junk data to be inserted possibly cause a crash of MySQL? Or something else?
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