I have an excel spreadsheet which has some data, I want to essentially join that with a table in the prod db to which I have only read only access.
Is there an easy way to do this?
Since I can't actually create a table and actually join, I was wondering if there is a way sql developer can store the data in memory.
I'm trying to describe a virtual table.
Specifically I'm working with SQL developer and an Oracle DB. If there are other free tools which support this, then I'm happy to use them too.
Related
I have some tables with huge columns (more than 600 columns) and don't have DDL(create table) scripts for it. I can create the script by seeing the table schema using DESCRIBE keyword in oracle nosql, but it's a huge pain in the back because of manual operation.
Is there any way to generate DDL scripts for existing tables in Oracle NoSql database?
There is no way to do this at this time. It's being considered as an extension to the sql shell. One option in user code would be to use the "describe as json ..." call and parse the JSON description of the table to construct the DDL string
I am developing a java app which can connect to oracle database and selecting column names from any tables, after selecting columns i have to query the data from those tables which the user select in my java app, now my question is how can i join all tables in the database so that query returns data successfully, i want to connect to any oracle schema to a specific, i will make the logic in java, but i am unable to find the query which can extract the data from all tables, i tried natural join among all tables but it has dependency of having same name of connecting columns. so i want to know any generic way which can work in all conditions.
As others have mentioned.. it seems that there are other tools out there that you probably should leverage prior to trying to roll your own complex solution.
With that said if you wish to roll your own solution you could look into using some of oracle's dictionary tables. Such as:
Select * from all_tables;
Select * from all_tab_cols;
i am working on a large database ,how do i Export some database tables without having dba privileges .do i have to copy the structures of the tables and using spool command to get the data in a text file then create the tables and inserting data from the text file?
One of the methods would be to install Oracle SQL Developer and export the required table structures and data using the wizard.
Here is the link to a tutorial which can guide you if you go with this option.
http://www.oracle.com/webfolder/technetwork/tutorials/obe/db/sqldev/r30/SQLdev3.0_Import_Export/sqldev3.0_import_export.htm
A second option would be to use SQL Loader to load data in your target tables. But for that you will have to first create the data structures on your target schema and spool the data from your source tables in CSV (comma separated values) or any other eligible format.
Here is a link for SQL Loader.
http://docs.oracle.com/cd/B28359_01/server.111/b28319/ldr_concepts.htm
A third option would be that you create the table structures on the target schema and generate the insert statements from the source schema using a script. Here is a link to such an example.
https://pandazen.wordpress.com/2008/08/18/generate-insert-statement-script-to-extract-data-from-oracle-table/
I would recommend going with the SQL Developer option since it is relatively simple.
Hey EXPERIENCED SSIS DEVELOPERS, I need your help.
High-Level Requirements
Query SQL Server table (on a different server than my SSIS server) resulting in about 200-300k records results set.
Use three output colums for each row to lookup date in Oracle database.
Insert or Update SQL Server table with results.
Use SSIS.
SQL Server 2008
Sounds easy, right?
Here is what I have done:
Created on Control Flow Execute SQL Task that gets a recordset from SQL Server. Very fast, easy query, like select field1, field2, field 3 from table where condition > 0. That's it. Takes less than a second.
Created a variable (evaluated as expression) for the Oracle query that uses the results set from the above in the WHERE clause.
Created a ForEachLoop Container that takes the results (from #1 above) for each row in the recordset and runs it through a Data Flow that uses the Oracle query (from #2 above) with Data access mode: SQL command from variable against an Oracle data source. Fast, simple query with only about 6 columns returned.
Data Conversion - obvious reasons - changing 3 columns from Oracle data types to SQL Server data types.
OLE DB Destination to insert to SQL Server using Fast Load to staging table.
It works perfectly! Hooray! Bad news - it is very, very slow. When I say slow, I mean it process 3000 records per hour. Holy moly - so freaking slow.
Question: am I missing a way to speed it up? It seems like the ForEachLoop Container is the bottleneck. Growl.
Important Points:
- I have NO write access in Oracle environment, so don't even suggest a potential solution that requires it. Not a possibility. At all.
Oracle sources do not allow for direct parameter definition. So no SELECT FIELD FROM TABLE WHERE ?. Don't suggest it - doesn't work.
Ideas
- Should I find a way to break down the results of the Execute SQL task and send them through several ForEachLoop Containers for faster processing?
Is there another design that is more appropriate?
Is there a script I can use that is faster?
Would it be faster to create a temporary table in memory and populate it - then use the results to bulk insert to SQL Server? Does this work when using an Oracle data source?
ANY OTHER IDEAS?
I need to create a flat file and push information into it from oracle database using JSP.
I require a sample code. Help will be appreciated.
If you're looking for an easy way to write different SQL statements to a file, use this procedure: http://www.oracle-developer.net/content/utilities/data_dump.sql
Also you might want to look into DBMS_XSLPROCESSOR.CLOB2FILE.
I think you need to look into Oracle external tables. These are flat files that appear as tables in the Oracle database. You would simply insert data into it using SQL (as per any other database table). Google "Oracle External Tables" for more information.