Tagged Questions

Best practices are generally and informally recognized as the methods and processes that have been shown over time to be superior to those achieved by other means.

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8 views

1500 Matching File Merge or Import Pre-System to Cleanse [closed]

I have 1500 Account "Family Tree" Files with the same columns and headers in .xls form. These files contain complete and incomplete data. What do I use to mass clean these files so we do not import ...
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0answers
24 views

SQL Server Database Table Partitioning Consideration

I have a SQL Server table with 42 million + records. This table acts as a staging area for transaction records loaded from a different system. Data from this staging table have to be transformed and ...
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1answer
21 views

Indicators for right balance of the number of DB2 instances per AIX LPAR

I have a question that has been bugging me, but I just don't know how to validate it. We run DB2 LUW on AIX in our shop. Our AIX is currently at 7.1. Our DB2 is at 9.7 FP 4 for most installations and ...
0
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1answer
73 views

No-SQL Database Design for restaurant app

I've been working with SQL databases all my life and I am now trying to get into the NoSQL world. I am a looking for a piece of advice on whats the best practice in order to achieve this. Suppose I ...
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1answer
44 views

Tables names in a supertype/subtype schema

I have 3 types of users in my app. The users share some common attributes, but they also have quite a bit of stuff that pertains uniquely to each user type. I have a person table that contains limited ...
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1answer
85 views

Oracle - WHY do an ORDER BY for INSERTs AS SELECT?

I have an application that was migrated from MSSQL to Oracle 11G. It needs re-design but that's outside the scope of the project. In short, the application gets legacy data, builds a parent table ...
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4answers
198 views

How do I tactfully bring up database shortcomings? [closed]

A little background: I recently inherited responsibility for support and development of a database application after the original developers left. Looking through the application, the database ...
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2answers
55 views

Merits of inserting to temp table and renaming versus just adding/removing columns

If I add or drop columns from a SQL Server table I presume I get page splits or gaps. Since the size of the row has changed. When I use RedGate SQL Compare to create conversion scripts its strategy ...
2
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1answer
50 views

Inheritance or lot of relationship?

I have to transpose a class Diagram into a Physical Data Model (more precisely MySQL database structure). In my class diagram, I have a lot of entities (A, B, C, D) which inherit from an other ...
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1answer
57 views

creating a 24 hours data table - Suggestions/improvements

I am planing to have a table to store the data based on every hour , in short I have a file with 24 hour data and I need to use this to populate a hourly bar/line graph. Below is a sample 24hr data ...
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2answers
137 views

Best practices for service name / aliases in tnsnames

I have this idea that service names / aliases given to connections descritors in a tnsnames.ora (not the one in the server that dblinks use, but the one for the public) file should in no way be ...
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1answer
381 views

Efficient way to insert/update/delete table records from complex query in Postgres 9.x

I have this function which returns a set a records and I need to persist those records into a table. I have to do it hundred times a day. My initial approach was just clear data from my table and ...
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2answers
80 views

Does anyone use modules in DB2 LUW?

Our environment is currently DB2 9.7 Fix Pack 4 on AIX. I am in the processing of designing and coding some SQL PL stored procedures responsible for archiving data into an archive schema and then ...
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5answers
465 views

Using Timestamp plus Integer as Primary Key

In Sql Server, what would the drawbacks and disadvantages be of using a primary key that is: Two Character Table Identifier + YEAR + MONTH + DAY + HOUR + MINUTE + MILLISECOND + random integer between ...
0
votes
1answer
94 views

Inheritance discriminator column better int or varchar or enum?

What is the best practice for storing a discriminator column ? Does it make any difference ? Any pros/cons of using one over the other ? I am using MySql with Entity Framework but the question goes ...
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0answers
67 views

Where Can I find *Current* PostgreSQL advice for a SQL Server DBA? [closed]

Been a MSSQL DBA for about 7 years. I have the fundamentals of performance, backups, replication, security and design down for MSSQL. I'm not setting up new applications using PostgreSQL 9.2. I have ...
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2answers
50 views

Should I opt for a new database or adding more tables?

this is a question around best practice that I'm currently dealing with. I have a database (SQL Server 2008 R2) with a heap of tables (around 40) with data, now the need has risen to have logging of ...
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2answers
92 views

Are #tables and #procedures 'not best practice' or 'bad practice'?

I am working on a project and part of it is an interface tool that executes SQL code stored in a xml file to import/export files. In the file, temp procedures and temp tables are used quite heavily ...
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2answers
270 views

When should I NOT set the Maximum Server Memory option in SQL Server?

In SQL Server, I normally set the Maximum Server Memory setting to one of the popular best practices, such as leaving 10% or 4GB, whichever is higher. ...
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0answers
24 views

Lock rows for long running transactions

I have a question table from which agents try to answer 5 questions at a time. Obviously, I want to avoid agent collision i.e. if an agent is answering a question, other agents can not work on it. Is ...
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1answer
42 views

Organizing Database Objects in a Database that are not part of the systems original Database Objects?

I've been working at a place for about 2 years now with a series of heterogeneous legacy database applications, which are tied together using 3rd party Microsoft Access databases (*.mdb). Soon we ...
1
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1answer
41 views

UK Addresses in 3NF

I am in the process of creating a UK only database which holds information for various sets of people i.e. Staff, Clients etc. The tables for each of these sets of people have an Address, City and ...
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1answer
141 views

What's better here - a single column or multicolumn primary key?

Let's assume you have a table groups and a table item. Each item belongs to exactly one group. It is an inherent part of that group. An item cannot exist outside of a group and it cannot be moved to ...
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0answers
27 views

Hints about Datatypes

I'm currently writing some style guides for a new project where we want to use Oracle for the first time in a extensive manor. I already wrote down some naming conventions for tables, columns, pk, ... ...
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0answers
21 views

Performance One Row With Total Vs Multiple Rows with Seperate Values?

Not 100% sure how to explain this situation but here it goes: I am building an Inventory Database that all items received are entered into and a label is created for each Container, that is going to ...
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2answers
140 views

Memory Allocation in Shared DB & IIS Environment

In my use case, we have production servers that host both IIS & SQL on the same machine, not ideal but no flexibility to change that. Basically a single machine is both a DB and an Application ...
12
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1answer
2k views

GO After every T-SQL statement

What is the reasoning behind using the GO statement after every SQL statement? I understand that GO signals the end of batch and/or allows the reputation of statements but what advantage does it have ...
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3answers
55 views

Item availability in row or another table

I'm a database newbie, so please bear with me. Say I'm creating a library database. I have a table containing information about books. Do you put the book availability as a row in this table or would ...
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0answers
158 views

What's is the best way to get incremental changes from production to incrementally changed development database?

I came to a new dev team where all development is on the same (instance) of an SQL Server (2005) database once in 1-2 days restored from a current full backup of production database replacing a dev ...
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3answers
1k views

Best practices for configuring the Drive/Filegroup setup for Microsoft SQL 2008

I am a software developer for a small company. I wish we had a dba but not in the cards at this point for this company. I was working on migrating our 75gb SQL Server 2000 database to SQL Server 2008 ...
2
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0answers
140 views

Use Matlab or SQL Server to do mathematical computations? [closed]

Current situtation I am working with a dozen of CSV files containing financial simulations in form of 100'000x100 matrices. Each file is around 100Mb large. Until now, only analyse these files with ...
2
votes
3answers
147 views

How to make stored procedures more readable without harming performance

I come from OOP background, and I need to write and maintain huge stored procedures. Naturally, the sprocs become quite unreadable very quickly, no matter how much I try formatting, giving readable ...
1
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1answer
101 views

MySQL DB dynamic ranking or “static” separately saved

I have a table where I store the points with the connected categories and game-types of each user. There are different ways to get points. However everytime when the points need to get displayed in a ...
0
votes
1answer
49 views

Query optimization ndbcluster + order by

I'm not really all too familiar with the ndbcluster storage engine of MySQL, but I've recently written an application that does some very simple queries. However, a co-worker of mine (who is now on ...
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votes
3answers
334 views

Uniqueidentifier vs. IDENTITY vs. Material Code --which is the best choice for primary key? [closed]

Which one is the best choice for primary key in SQL Server?There are some example code: Uniqueidentifiers e.g. CREATE TABLE new_employees (employeeId UNIQUEIDENTIFIER DEFAULT NEWID(), ...
1
vote
2answers
80 views

Is it worth it to create an “Id” column?

I have a table which has a column Name, which is of type VARCHAR2(20), unique, cannot be null, and cannot be changed. At first I used it as a Primary Key for this table but I was wondering if it was ...
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3answers
356 views

Proper use of database functions for business logic

I have a database in postgres with 147 tables; these tables contain data generated by functions that have most of the logic of the system, for example how to build an accounting entry. These ...
0
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3answers
80 views

Is it good practice to create new tables for new elements in a database?

I am trying to create a good model for a database that I need for an application. The way that I have tought about realizing it involves creating a new table for each new element that is added, but I ...
2
votes
1answer
2k views

Max Memory settings on Multi-Instance SQL Server 2008 R2 Cluster

SQL Server 2008 R2 multi-instance cluster (on VMware vSphere 5.1) 2 nodes, each running 2 instances 16GB RAM per node. The only time the instances are on the same node is when I am patching the ...
0
votes
1answer
2k views

DB2 9.7 LUW - How do I SET SESSION_USER when I am DBADM,SECADM?

Based on a previous question I have asked, I am attempting to work on a solution as recommended by mustaccio's answer, whereby I have another ID to create my DDL objects. I have been trying to follow ...
2
votes
1answer
2k views

MySQL: Alter Table on very active table gives “Waiting for table metadata lock”

At my work, we've recently upgraded to MySQL 5.5 and since then, have been bitten a few times by the new (and intended) behavior of metadata locking. Basically, whenever we run an ALTER TABLE ...
4
votes
2answers
652 views

Postgres DDL and DML best practices and coding standards

Is there a best practice or coding/design conventions for Postgres both DDL and DML/SQL that you could share and recommend. I am looking for something similar to what Google has for programming. ...
6
votes
2answers
3k views

What steps are necessary to safely restart a machine hosting Microsoft SQL Server?

Are there any special steps necessary to prevent data corruption when restarting a server hosting an MS SQL instance? For example, I recently encountered the recommendation of stopping the SQL ...
1
vote
1answer
72 views

Is it a good way to use different schemas for storing the data and provide data access?

For a new product we came along with a pattern, where all the data tables are stored in one schema (lets call it storage), while the clients connect to another one (here called api). The api schema ...
1
vote
2answers
5k views

Splitting a large table to improve performance

This is a follow-up to an earlier question. I have a SQL Server 2008 R2 Standard server, that holds a single database, which itself has almost nothing except a large table. The table is 100+ million ...
3
votes
3answers
253 views

Why set up static data in views vs. using tables in mysql?

I get an LDAP feed nightly. I get it as a text file and dump/create my LDAPALL table. There are roughly 75K employees times about 50 fields. I have the following too: LDAPIMPORTANT - view that ...
1
vote
2answers
180 views

How to avoid timeouts during big DML operations

I have a big insert script I need to run. Its about 55,000 records and 160 columns. The script is already created and I can't create it again. The problem I have is that this runs for about 4 hours ...
0
votes
1answer
363 views

How to revoke DBADM and clean up any related objects from DB2 LUW

This question has started because of us taking copies of production backups and restoring them into lower environments (with scrambled data of course) for developers to practice and/or debug against. ...
2
votes
1answer
748 views

Multiple Similar Tables vs One Master Table

I'm a web app developer and less experienced in database design, so would appreciate anyone's input. When I first built this web app, the app managed one type of object (table) with a handful of ...
0
votes
1answer
1k views

DB2 LUW: Should temporary tablespaces share bufferpools with other tablespaces?

We are in the process of tuning a massive application our company has just written. Part of that tuning includes tuning the databases. We run DB2 LUW on AIX. Specifically we are at 9.7 Fix Pack 4 ...