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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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How can we establish multiple databases connection in Laravel. I have to save data in 3 different tables in laravel. I have to connect one laravel application with 3 databases. Is it any way to do this?
Please go through this link how to set multiple databases in laravel
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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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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 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 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.