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what is information_schema and performance_shema in MySql? These two schema databases presents in mysql default. What does they works?
Information_schema contains metadata about databases in mysql. For e.g. names of tables,columns in a database etc. performance_schema is for monitoring MySQL Server execution at a low level. The performance_schema is intended to provide access to useful information about server execution.
For more info check here and here
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I am participating in an project that using MongoDB as the datasorce instead of MySQL. The project is an APP for live-streaming with large amount of data and frequent IO. I am not sure if MongoDB is better than MySQL in this scenario.
Very likely no. MongoDB would excel in cases where you have hierarchical data in several levels and an arbitrary structure. If your data falls naturally into columns and tables then MySQL would likely trounce MongoDB.
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I am looking for a way to backup MySql database use a C program. Does MySql provide API for backup?
No, mysql does not provide any dpecific api to back a database up.
Mysql does provide the mysqldump utility that can be called from the command line to back up a database and also provides a general C api to access a mysql server. The heneral api can be used to write your own backup program if you are unhappy with mysqldump.
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I want to use Redis in Magento instead of mysql? I do like how to done it?
Good day.
Redis is not a replacement MySQL.
If you you want to use NoSQL with Magento, you must choose DB with guarantee the preservation to Storage
For Example - MongoDB
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I've been searching information about how access, MySQL, SQL Server and Oracle save the metadata of the databases, and I couldn't found it.
You can retrive MetaData of the table "database independent" using JDBC:
DatabaseMetaData databaseMetaData = connection.getMetaData();
You just need to add the connector (can be MySQL JDBC, SQL Server, SQLite, Oracle, Postgree, etc).
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I have to copy tables from one database on Azure to another which is on our virtual server there on Azure. Importing is not working. What would be the way to make this. The other issue is some of the tables have different columns can I copy matched columns only? this is sql servers.
SQL-Azure does not support USE statement and effectively no cross-db queries.
If you want to copy/backup the db to another sql azure db you can use the "Same-server" copying or "Cross-Server" copying in SQL-Azure. Refer this msdn article