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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
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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'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 some questions regarding linq to sql with c#. hope you can help...
Does creating Data base new DataContext load the entire DB to local cache every time?
If the answer is yes, Is there a way to Load Only the required part of the DB(with Querys Or Stored procedures maybe) to do so ?
3.Does Linq To Enteties is more suitable for this requirements ?
1/ No, it does not load anything from the Database untill the query is executed
2/ ...
3/ You can load the entire database in Cache if you want to. BUt that has nothing to do with Linq-2-entities or Linq-2-sql. You can do it with either technology.
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I am very new in PostgreSQL database. I am currently using MS SQL server 2008. Now i need the whole data in postgreSQL, I have installed postgreSQL in my server. Kindly tell me the procedure to connect with PostgreSQl. If there is no option, kindly tell me whether we can take back up of MS SQl and restore it in postgreSQl
thanks in advance
Either you need an ETL tool to transfer the data from one to the other or you have to export in a neutral format, like .csv, and import into the other using built in tools.
I'd opt for the first one.