I created a query that takes a database backup at certain specified location. I want to use it as a stored procedure but this should act as a global stored procedure so that whenever this SP is called. Then database backup is taken. It uses DB_Name() to take database backup of owner database. Is it … Read more
I’ve just installed hadoop and hbase from cloudera (3) but when I try to go to http://localhost:60010 it just sits there continually loading. I can get to the regionserver fine – http://localhost:60030… Looking at the master hbase server logs I can see the following. Looks like a problem with the root region. All of this … Read more
All my classes have an @Version annotation, so I assumed they were using optimistic locking. But I the following exception in my logs that seem to indicate Im using pessimistic locking. So which is it ? (I want to use optimistic locking) update Song set acoustidFingerprint=?, acoustidId=?, album=?, albumArtist=?, albumArtistSort=?, albumSort=?, amazonId=?, arranger=?, artist=?, artistSort=?, … Read more
Given an example of the following select in CQL: SELECT * FROM tickets WHERE ID IN (1,2,3,4) Given ID is a partition key, is using IN relation better than doing multiple queries or is there no difference? Answer I remembered seeing someone answer this question in the Cassandra user mailing list a short while back, … Read more
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago. Improve this question I’m studying Hibernate and JPA, and I am finding this term all the time. Could … Read more
I am studying Cassandra by its document. But when I use “pip install cassandra-driver” to install cassandra-driver ,failed like this: weikairen2@weikairen2-virtual-machine:~$ pip install cassandra-driver Collecting cassandra-driver Using cached cassandra-driver-3.7.0.tar.gz Requirement already satisfied (use –upgrade to upgrade): six>=1.6 in ./.local/lib/python2.7/site-packages (from cassandra-driver) Requirement already satisfied (use –upgrade to upgrade): futures in ./.local/lib/python2.7/site-packages (from cassandra-driver) Building wheels … Read more
How can I drop Foreign keys in general. I mean, if I have many foreign key constraints in a table. like MonthlyEvaluatedBudgetTable Contraints: budgetid_pk (Primary Key) branchid_fk (Foreign Key) accountid_fk (Foreign Key) dept_fk (Foreign Key) Is there a way in postgres to drop all foreign keys in general and not specifically in an existing table? … Read more
Is it true that ORDER BY is generally pretty slow? I am trying to run some sql statements where the WHERE clause is pretty simple, but then I am trying an ORDER BY on a VARCHAR(50) indexed column. I need to sort alphabetically for display reasons. I figured that getting the database to do it … Read more
I am creating a rails application that needs to store a large amount of sensitive data. To assure my customers that the data is being protected, I want to encrypt it on a per-user basis. I have done research looking for gems that can accomplish this. So far I’ve found strongbox and safe. Together, this … Read more
I’m changing constraints in my database and I need to drop some of them. I know that for a single constraint, the command is following: ALTER TABLE tblApplication DROP CONSTRAINT constraint1_name; However, when I try ALTER TABLE tblApplication DROP ( CONSTRAINT constraint1_name, CONSTRAINT constraint2_name, CONSTRAINT constraint3_name ); it doesn’t work and I need to do: … Read more
