TweetShareSharePin0 SharesLet’s start with baby steps We’re all very excited to read a new blog with a neat trick or a cool and complex feature or even a very useful undocumented function. However that is preaching to the choir. We do that and then we get together and complain that there is no new fresh talent in the database business. Well, it may be a bit hard to get into it if all we do are talking new features and really […]
Month: May 2019
Getting t1001 in interactive grid PK
TweetShareSharePin0 SharesHave you been plagued with the issue of getting values like t1001 show up in columns you marked as primary key in your interactive grid? In case you do not feel it is a good interface for your end users you may have found yourself spending quality time with Google looking for clues. I have had a couple of people asking me about this in just the last week. Googling turns up very little and mostly about the T1000 processor […]
Quicktip: Don’t grant access to a synonym
TweetShareSharePin0 SharesI’ve seen this in a few places lately. When I ask the database guys there about it, they think this DDL would never work or “it does nothing but does not return an error”. Here is an example, All of the following is performed by a DBA user. We create a table, let’s call it TB. It is owned by user A. User B is granted select privilege to A.TB. A synonym is created for user B pointing to A.TB, let’s call […]
When views causes havoc
TweetShareSharePin0 SharesViews are great. They simplify design, makes code look more elegant and hides complexity. They also enables reuse by putting complex code in just one place instead of in every accessing piece of code. But… There once was a large project that has been churning away for a long time. The performance of having more than one user on the system was horrendous. But it was chalked up to misconfiguration. I am asked to spend a day giving said […]
Quick note on MT and applications II
TweetShareSharePin0 SharesTalking about Multi Tenant and applications, one has to talk about the different options for sharing. It is one of the great features of multi tenant. It is a way to let one PDB – the application root – have data that can be used from other PDBs. There are three kinds that allow you to get different features of the sharing. Metadata Data Extended Data Lets review each kind and why and how you’d use it. Metadata This allows […]
Quick note on MT and applications
TweetShareSharePin0 SharesAre you using multi tenant with multiple containers and you’re not familiar with application containers? It allows you to set up PDBs that belong to a CDB-like PDB that “owns” them. With that you can install applications (database objects) in the container, and then decide into which PDB to install, upgrade or patch that particular application, So you could have an application that is a set of schemas with objects that belong together in a logical sense. Once you have […]
Does recreating a view remove the privileges?
TweetShareSharePin0 SharesShort answer: No This blog post is pretty much just to document what seems to have been hard to find online. At work there was a big rework of a liquibase project due to the perception that “create or replace view” on an existing view would make the granted privileges be dropped. That was of course not what happened. The issue was that using liquibase the new version of the view was installed. Then the rollback was triggered and […]
Your very own development environment
TweetShareSharePin0 SharesEveryone should have their own local development environment. No matter if you write Java and that just means IDE and JDG, or if you work with databases. Not having it reduces your learning a lot. I have yet to meet a really sharp database expert who does not have a local personal environment. It also goes the other way around, you can usually guess if a person has it or not. Yes, you can get a database by just […]