Skip to main content

Performance Tuning and Optimization

1.       What are the different ways and methods of performance tuning and optimization ?
a.       Indexing
b.      Achieving
c.       Load Balancing
d.      Query Refactoring
e.      System/Resource Level Optimization (CPU,Memory,IO Configuration)
2.       What is Index ?
3.       What is Heap ?
4.       What is B-Tree/Balance Tree ?
5.       What are the kinds of Indexes ? – Clustered and Non-Clustered
6.       What are differences between Clustered and Non-Clustered Indexes ?
7.       What is execution plan / query execution plan ?
8.       What is Estimated and Actual Execution Plan ?
9.       How do you plan about Indexes in your database ?
10.   What is difference between Table scan and Index Scan ?
11.   What is Composite Index ?
12.   What is Filtered Index ?
13.   What is Fill Factor ?
14.   What is Page Split Problem in Sql Server ?
15.   What is Fragmentation , Explain ?
16.   What is difference between Index Reorganize or Rebuild ?
17.   What is Statistics or Index Statistics ?
18.   How to check and Update in Statistics ?
19.   What is Page and Extent ?
20.   What is difference between Index Seek and Index Scan ?
21.   How to enable and disable indexes in database ?
22.   Can we create clustered index without PK ?
23.   Can we create  Clustered Index without Primary Key ?
24.   Can we create Primary Key without Clustered Index ?
25.   How to recompile Stored Procedure at Run Time ?
26.   How to avoid dead locks and blocking ?
27.   What is DTA (data tuning advisory) ? How to use it for Performance Tuning ?
28.   Why we can create only one clustered index per table ?
29.   What are the pros and cons of NOLOCK ?
30.   What is Query Optimizer ?
31.   What is Data Achieving ?
32.   What is Data Purging ?
33.   What is Data and Database Partition ?
34.   What are the types of Partition ? What is Horizontal and Vertical Partition ?
35.   What is Table Partitioning ? How to perform partitioning process. Explain .
36.   What is Index Partitioning ? How to perform partitioning process. Explain .
37.   What is Indexed View or Materialized View ? Benefits of Indexed View ?
38.   How to Created Indexed View ?
39.   How do you decide about Index Maintenance , which one to rebuild and reorganize ?
40.   How to check index fragmentation ?
41.   How do we rebuild large indexes ?
42.   Where does logs get stored in SQL Server ?
43.   What is Full Text Search ? how to configure ?
44.   What is Two Phase Commit ?

45.   Does Table or Column Alias effect performance ?
Labels:

Popular posts from this blog

How to encrypt and decrypt Table data in postgres

For encrypting and decrypting , we must use the bytea data type on the column which we implement. Bcoz bytea will use the pgcrypto method by default. However, you will need to create the pgcrypto extension to enable these functions as they are not pre-defined in PostgreSQL/PPAS. Example CREATE EXTENSION pgcrypto; CREATE TABLE userinfo (username varchar(20), password bytea); >>    Inserting the data in an encrypted format INSERT INTO userinfo VALUES(' suman ',encrypt('111222','password','aes')); select * from userinfo ; >>    Retrieving the data as decrypted format SELECT decrypt(password,decode('password','escape'::text),'aes'::text) FROM userinfo; Thanks for reading Plz dont forget to like Facebook Page.. https://www.facebook.com/pages/Sql-DBAcoin/523110684456757
1 comment
Read more

How to recover msdb database from suspect mode

 It was Monday 9 th Jun 47 degr. temperature of Delhi-NCR. Temperature was like boiling me and database. When I reached my office( @ 8.45 am) got an alert from one of Server. “MSDB is in suspected mode” At the same time comes in my mind, this issue will boil me today.. I just tried to cool my self through cold drink then connected server from my local system using windows authentication mode..
5 comments
Read more

SQL71562: external references are not supported when creating a package from this platform

Last week I got this error from one of developer who was trying to deploy his project from Testing server to SQL Azure QA server. He was using “Deploy Database to SQL Azure” option from SSMS Tool-Task option. After connecting to SQL Azure portal when operation started to deployment below errors occurs. Validation of the schema model for data package failed. Error SQL71562: Error validating element xx.xxx.xx:function .dbo.xxx has an unresolved refrence to object xx.dbo.xxxx external refrences are not supported when creating a package from this platform . Reason: The reason of the this error was; some functions of project was dependent on master database and only single database was being deploy to SQL Azure. DACFx must block Export when object definitions (views, procedures, etc.) contain external references, as Azure SQL Database does not allow cross-database external references So, this error was coming. Solution : I suggested him to create those function to locally
2 comments
Read more