I have found out that there's two versions of SQL Server types that are very different in terms of pricing...
The Web version from my host provider costs about 13$ per 2 core packs, whereas the Standard edition is right around 200$.
From my…
I have a User model that looks like this:
class User < ApplicationRecord
belongs_to :organization
belongs_to :department
end
The users table in the database has the two foreign keys organization_id and department_id. How can I make these two…
Is it possible in PostgreSQL to create a deferrable unique constraint on a character column, but case-insensitive?
Let's assume the following basic table:
CREATE TABLE sample_table (
my_column VARCHAR(100)
);
If deferrable constraint is not…
I have annotation-driven hibernate capabilies on my project.
Now I want to create an index over a column. My current column definition is
@NotNull
@Column(name = "hash")
private String hash;
and I add @Index annotation here.
@NotNull
@Column(name =…
When searching on Google for join table indexes, I got this question.
Now, I believe that it is giving some false information in the accepted answer, or I do not understand how everything works.
Given the following tables (running on PostGreSQL…
Description :
Here is the sample demonstration of the performance issue.
We first created two tables , enabled row level security and created policy as well .
Table definition:
create table sample_schema.sample_table1(ID numeric(38) PRIMARY KEY NOT…
I am trying to compile a list of non-system-specific database indexes. I've looked at Oracle, DB2, MySQL, Postgres and Sybase, and almost every resource has a different list. So far I have seen:
clustered, multi-dimensional clustered, unclustered,…
I am trying to reproduce the first example of index intersection instruction (http://docs.mongodb.org/manual/core/index-intersection/) but facing a problem: mongo doesn't uses both indexes
My steps:
Download mongo (3.0.3) and install it
Run mongod:…
I have a column Column which is declared to be NULL DEFAULT(GETUTCDATE()) and there's a non-clustered index that includes this column. I want to change this column to be NOT NULL DEFAULT(GETUTCDATE()) and when I run ALTER TABLE ALTER COLUMN…
I use NHibernate and SQL Server 2005 and I have an index on a computed column in one of my tables.
My problem is that when I insert a record to that table I get the following error:
INSERT failed because the following SET options have incorrect…
I know how binary search works but I wanted to know practical uses for binary search...
I searched through the internet and I found that the main use is data base indexing, but I couldn't understand how binary search could help in data base…
The documentation says :
https://firebase.google.com/docs/firestore/query-data/indexing
To delete an index:
Go to the Cloud Firestore section of the Firebase console.
Click the Indexes tab.
Hover over the index you want to delete and select Delete…
Is there any way to create indexes in oracle only if they don't exists ?
Something like
CREATE INDEX IF NOT EXISTS ord_customer_ix
ON orders (customer_id);
So I made a backup of a table using pg_dump:
pg_dump -U bob -F c -d commerce -t orders > orders.dump
This table had several listed indexes such as a primary key
However when I restore this table into a development database on another system using…
Looking for the view I can list up all 'invalid' objects in PostgreSQL.
In Oracle, we can use dab_objects.status column but I'm not sure if there is a simple way to do such a thing in PostgreSQL.
Maybe, I can check the invalid indexes with below…
