I would like to know how I can get the metadata of an object in a Vertica database; like metadata of a table. Is there any table that stores the metadata of objects (functions, views, tables) in Vertica Database.
For example in Oracle, I could type the following and get a detailed description of tables or see the code of a procedure.
oracle :> desc table_name;
or
oracle :> edit proc_name;
I know that I can see the tables from my schemas with \dt command, but is there any way I can see the DDL statements that created the objects?
Thanks, but this is not what I want. I was looking for is the export_objects() function:
select export_objects('','object_name')
This way you will get the creation script for the object.
\d table-name should get you what you need.
Extra tip: If you specify only the schema, you will get all of the objects inside that schema. Sure beats having to enter a loop where you run export_objects() for every object.
Related
I'm currently trying to create txt files from all tables in the dbo schema
I have like 200s-300s tables there, so it would takes up too much times to create it manually..
I was thinking for creating a loop.
so as example (using AdventureWorks2019) :
select t.name as table_name
from sys.tables t
where schema_name(t.schema_id) = 'Person'
order by table_name;
This would get all the table name within the Person schema.
So I would loop :
Table input : select * from ${table_name}
But then i realized that for txt files, i need to declare all the field and their data types in pentaho, so it would become a problems.
Any ideas how to do this "backup" txt files?
Using Metadata Injection and more queries to the schema catalog tables in SQL Server. You not only need to retrieve the table name, you would need to afterwards retrieve the columns in that table and the data types, and inject that information (metadata) to the text output step.
You have in the samples directory of your spoon installation an example on how to use Metadata Injection, use it, along with the documentation, to build a simple example (the check to generate a transformation with the metadata you have injected is of great use to debug)
I have something similar to copy data from one database to another, both in Oracle, but with SQL Server you have similar catalog tables as in Oracle to retrieve the information you need. I created a simple, almost empty transformation to read one table and write to another. This transformation has almost no information, only the database origin in the Table Input step and the target database in the Table Output step:
And then I have a second transformation where I fill up all the information (metadata) to inject: The query to perform in the Table Input step, and all the data I need in the Table Output: Target table, if I need to truncate before inserting, the columns from (stream field) and to (Table field):
I want to create a table (lets say table_copy) which has same columns as other table (lets call it table_original) in Oracle database, so the query will be like this :
create table table_copy as (select * from table_original where 1=0);
This will create a table, but the constraints of table_original are not copied to table_copy, so what should be done in this case?
Only NOT NULL constraints are copied using Create Table As Syntax (CTAS). Others should be created manually.
You might however query data dictionary view to see the definitions of constraints and implement them on your new table using PL/SQL.
The other tool that might be helpful is Oracle Data Pump. You could import the table using REMAP_TABLE option specifying the name for the new table.
Use a database tool to extract the DDL needed for the constraints (SQL Developer does the job). Edit the resulting script to match the name of the new class.
Execute the script.
If you need to do this programmatically you can use a statement like this:
DBMS_METADATA.GET_DDL('TABLE','PERSON') from DUAL;
I am reverse-engineering an application which administers an Oracle database.
Everything is new to me (application + database)
There is a statement there somewhere, which is:
SELECT * FROM XXX#YYY (XXX is a word, YYY another word)
If I go into my database with TOAD I can't find an 'XXX#YYY' table nor view. If I copy paste the statement in TOAD's editor, I get results as if the table exists.
I know that the '#' symbol is allowed for naming an Oracle object. Is it possible that it means something else here though?
How can I find the table (or view)? Is it possible to get information through a statement such as which schema does 'XXX#YYY' belong to or weather it is a table or a view, so that I can track it?
The database consists of many schemas. There is a default one. Is it possible that XXX#YYY may belong to another schema, rather than the default?
Please help me find the table.
Identifier behind # is database link. It is a way to access objects on some remote Oracle server. more info on http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_5005.htm#SQLRF01205
In Toad/Oracle XXX#YYY means object#database_link.
Look for the schema in your DB, there you will find the table.
Btw: I think its better to use SCHEMA.TABLENAME
If you have problems finding the SCHEMA, go to View->Toad Options, select Treeview at Browser style and then it should display all schemas.
I am a beginner to use talend etl I would make a request to select a database oracle then make a change _ S and insert it into a mysql table I'm stuck. I have not found how to make select queries with talend not know how I started that can help me please
To make a select on Oracle schema you need a tOracleInput component instance. You need to specify a Oracle connection (either a builtin connection or a repository-registered connection) and the output schema (the columns you need).
Then, click on "Guess query" to build the select SQL code accordingly to your desired output schema. You can then modify the automatically generated SQL code to fit your needs (ie. add WHERE or SORT clauses). Don't forget that output schema and selected columns must be the same (ie if you add a SQL-generated column inside the select clause you must add in your output schema, too). Any valid SELECT syntax can be used here (including subselects, cursors, window over partition and even more weird oracle stuff).
After the input instance, add a tMap where you make all your data manipulations. Finally, close with a tMySqlOutput, specifing connection and output table details. The flow will trivially looks like:
tOracleInput ----> tMap ----> tMySqlOutput
Create the connection Mysql and Oracle in Metadata Objects (Db Connections).
Create the following objects (tMySqlConnection - TOracleConnection)
Configure the objects with the parameters connections (Property Type: Repository).
Extract data: You can select the table with the object tOracleInput.
Edit schema of the table in the submenu Component
Create object TMAP, (transform the data)
Create object tMysqlOutPut and configure the schema and columns to insert.
Create object tMysqlCommit and close the connection.
Listo! ¡¡Run to job!! :)
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.