We are having few tables with partitions and we don't know how to get the partition keys for a specific table.
How can I get or view the partition key set up in oracle database for a specific table?
You'll find that information here:
select * from USER_PART_TABLES;
select * from USER_PART_KEY_COLUMNS;
Source.
Check out all the below data dictionary views,
ALL_PART_KEY_COLUMNS
DBA_PART_KEY_COLUMNS
USER_PART_KEY_COLUMNS
There is also a view called ALL_SUBPART_KEY_COLUMNS.
Related
I want to ask you if there is a solution to auto-synchronize a table ,e.g., every one minute based on view created in oracle.
This view is using data from another table. I've created a trigger but I noticed a big slowness in database whenever a user update a column or insert a row.
Furthermore, I've tested to create a job schedule on the specified table (Which I wanted to be synchronized with the view), however we don't have the privilege to do this.
Is there any other way to keep data updated between the table and the view ?
PS : I'm using toad for oracle V 12.9.0.71
A materialized view in Oracle is a database object that contains the results of a query. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. Materialized views, which store data based on remote tables, are also known as snapshots.
Example:
SQL> CREATE MATERIALIZED VIEW mv_emp_pk
REFRESH FAST START WITH SYSDATE
NEXT SYSDATE + 1/48
WITH PRIMARY KEY
AS SELECT * FROM emp#remote_db;
You can use cronjob or dbms_jobs to schedule a snapshot.
I would like to query all the table names that belongs to another database. I can query the contents of a table in another database using oracle links for example: select * from owner.tablename#another_database; but how do I select the owner name and table names of the tables in another database? Thank you.
SELECT * FROM user_tables#another_database;
I am trying to load the tables into oracle in-memory database. I have enable the tables for INMEMORY by using sql+ command ALTER TABLE table_name INMEMORY. The table also contains data i.e. the table is populated. But when I try to use the command SELECT v.owner, v.segment_name name, v.populate_status status from v$im_segments v;, it shows no rows selected.
What can be the problem?
Have you considered this?
https://docs.oracle.com/database/121/CNCPT/memory.htm#GUID-DF723C06-62FE-4E5A-8BE0-0703695A7886
Population of the IM Column Store in Response to Queries
Setting the INMEMORY attribute on an object means that this object is a candidate for population in the IM column store, not that the database immediately populates the object in memory.
By default (INMEMORY PRIORITY is set to NONE), the database delays population of a table in the IM column store until the database considers it useful. When the INMEMORY attribute is set for an object, the database may choose not to materialize all columns when the database determines that the memory is better used elsewhere. Also, the IM column store may populate a subset of columns from a table.
You probably need to run a select against the date first
Is there a query I can use to find out all the views across a Dataserver using a particular table or set of tables?
the below query will give you all the view that exists in the database:
select * from sysobjects where type ='V'
HIVE:
i have created a table and i loaded the data(1GB) into that table...while creating the table i didn't mentioned the partitioned column's.
Now i want create 10 partition's on the same table with already loaded data(1GB).
Could any body please give me a solution for this. thanks in advance
The concept of partition is to handle data , which cannot be created after you load data. It has to be defined in your DDL beforehand.
I suggest , you drop the table and create a new table with mentioning partitions.