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Since it is an opensource, it is licensed under the General Public License. From the given link, just click on the image “Download VirtualBox 6.1” and it redirects you to next page from where you can download the installation package by clicking on “Windows Hosts”. It downloads a VirtualBox-6.1.12-139181-Win.exe file sized 103 MB. TELUGU NOVELS, TELUGU BOOKS, MY LIBRARY I love reading Telugu Stories / Novels as everyone loves their native language. Every (Sun)Day I do sit back, relax in my garden, and I do start reading a Telugu Novel, I do enjoy Sunrise, A Cup of hot Tea 🙂 and the moment when I take a flower in my hand i feel earthlaughs in
SQL SERVER HEALTH CHECK HTML REPORT SQL Server Health Check HTML Report is the improved version of the old report and it can help you to quickly monitor the health of a given SQL Server instance. This report fetches and process the data from system tables and dynamic management views. It reports the crucial factors that showcase the current database instance performance. SQL SERVER INTERVIEW QUESTIONS AND ANSWERS Here with we are presenting a list of interview Q&A for SQL Server developers, SQL DBA’s, SQL Server Database architects, MSSQL Business intelligence developers. I have prepared this list of questions and answers, this information I have documented from my professional experience, various articles, blogs and other sourcesfrom internet.
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LATEST SQL DBA INTERVIEW QUESTIONS AND ANSWERS Provide all possible logs / event information that you collected during the RCA. In the post “Latest SQL DBA Interview Questions and Answers” we just listed few random SQL Server DBA interview questions with answers. These questions are shared by blog followers and we would like to appreciate everyone who shared their experiences.1000 Plus
DEPLOYING SSIS PACKAGE USING DEPLOYMENT MANIFEST WITH The post Deploying SSIS package using Deployment Manifest with screenshots can help you to deploy SSIS package using deployment manifest. To demonstrate this I have created a simple ETL package to load data from a Flat file to SQL Server table. SQL DBA ALWAYSON INTERVIEW QUESTIONS AND ANSWERS Interview Questions and Answers – 2. One of the best known feature introduced in SQL Server 2012 is “AlwaysOn” which makes use of existing HA/DR features and provide additional features like Availability Groups. This article is for SQL Server DBA’s who are preparing for interviews, this include basic and advanced level SQLDBA AlwaysOn
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Since it is an opensource, it is licensed under the General Public License. From the given link, just click on the image “Download VirtualBox 6.1” and it redirects you to next page from where you can download the installation package by clicking on “Windows Hosts”. It downloads a VirtualBox-6.1.12-139181-Win.exe file sized 103 MB. TELUGU NOVELS, TELUGU BOOKS, MY LIBRARY I love reading Telugu Stories / Novels as everyone loves their native language. Every (Sun)Day I do sit back, relax in my garden, and I do start reading a Telugu Novel, I do enjoy Sunrise, A Cup of hot Tea 🙂 and the moment when I take a flower in my hand i feel earthlaughs in
SQL SERVER HEALTH CHECK HTML REPORT SQL Server Health Check HTML Report is the improved version of the old report and it can help you to quickly monitor the health of a given SQL Server instance. This report fetches and process the data from system tables and dynamic management views. It reports the crucial factors that showcase the current database instance performance. SQL SERVER INTERVIEW QUESTIONS AND ANSWERS Here with we are presenting a list of interview Q&A for SQL Server developers, SQL DBA’s, SQL Server Database architects, MSSQL Business intelligence developers. I have prepared this list of questions and answers, this information I have documented from my professional experience, various articles, blogs and other sourcesfrom internet.
STATIC AND DYNAMIC PORT IN SQL SERVER Configuration. 2. Click Protocols for InstanceName, and then double-click TCP/IP in the right panel. 3. On the Protocol tab, notice the value of the Listen All item. 4. Click the IP Addresses tab: • If the value of Listen All is yes, the TCP/IP port number for this instance of SQL Server 2005 is the value of the TCP Dynamic Ports itemunder
LATEST SQL DBA INTERVIEW QUESTIONS AND ANSWERS Provide all possible logs / event information that you collected during the RCA. In the post “Latest SQL DBA Interview Questions and Answers” we just listed few random SQL Server DBA interview questions with answers. These questions are shared by blog followers and we would like to appreciate everyone who shared their experiences.1000 Plus
DEPLOYING SSIS PACKAGE USING DEPLOYMENT MANIFEST WITH The post Deploying SSIS package using Deployment Manifest with screenshots can help you to deploy SSIS package using deployment manifest. To demonstrate this I have created a simple ETL package to load data from a Flat file to SQL Server table. SQL DBA ALWAYSON INTERVIEW QUESTIONS AND ANSWERS Interview Questions and Answers – 2. One of the best known feature introduced in SQL Server 2012 is “AlwaysOn” which makes use of existing HA/DR features and provide additional features like Availability Groups. This article is for SQL Server DBA’s who are preparing for interviews, this include basic and advanced level SQLDBA AlwaysOn
SQL DBA ALWAYSON SCENARIO BASED INTERVIEW QUESTIONS AND SQL DBA AlwaysOn scenario based interview questions – 3. One of the best known feature introduced in SQL Server 2012 is “AlwaysOn” which makes use of existing HA/DR features and provide additional features like Availability Groups. This article is for SQL Server DBA’s who are preparing for interviews, this include basic andadvanced
SQL SERVER PERFORMANCE TUNING INTERVIEW QUESTIONS Performance Tuning – SQL Server Part – 1. Q. What are the bottlenecks that effects the performance of a Database / Application. The top performance bottlenecks for OLTP applications are outlined as: Too many indexes on frequently updated (inclusive of inserts, updatesand deletes):
ABOUT - UDAYARUMILLI.COM Here you find the information about Database systems, SQL Server, database administration, development, business intelligence, designing, architecture, Cloud etc. There are few reasons that inspires me to start this blog. One can share the information / code / samples / links across the community forums, groups and networks. UPGRADING SQL SERVER QUESTIONS AND ANSWERS Ans: Yes. SQL Server 2005 databases are compatible with SQL Server 2008. However, that attaching a SQL Server 2005 database to SQL Server 2008 automatically upgrades the SQL Server 2005 database to a SQL Server 2008 database and the database is then no longer usable by the SQL Server 2005 installation. 6. SQL SERVER PERFORMANCE TUNING INTERVIEW QUESTIONS Sql Server Performance Tuning Interview Questions Performance Tuning – SQL Server Part – 1. Q. What are the bottlenecks that effects the performance of a Database / Application. Ans:. The top performance bottlenecks for OLTP applications are outlined as: SQL SERVER DBA RESPONSIBILITIES AND ROLES We can categorize SQL Server DBA Responsibilities into 7 types. Capacity Management. Security Management. High Availability Management. Backup and Recovery Management. Performance Tuning. Process Improvements. Daily, Weekly and Monthly maintenance. Installations / Upgrades / TOP 40 SQL SERVER PERFORMANCE TUNING INTERVIEW QUESTIONS Top 40 SQL Server Performance Tuning Interview Questions SQL THE ONE. There are total 254 questions are answered under SQL Server Performance Tuning category in the book “SQL THE ONE”. In this chapter we can see questions and answers on Indexes, Statistics, Performance Monitoring, Query Tuning, Scenarios, Partitions, In-MemoryOLTP and TEMPDB.
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FILTERED INDEX ON NULL VALUES IS STILL DOING A KEY LOOKUP Posted on September 8, 2019by uday arumilli
Filtered Index on NULL values is still doing a Key Lookup takes you through a strange behavior of filtered index in SQL Server. Here,
we’ve discussed how a filtered index can help to improve the performance of your query. When I was working with one of the customer, in their critical production environment I’ve seen they created a filtered index on NULL values to cover more frequently used queries. But, when we are checking through the long running procedures we could see that Filtered Index on NULL values is still doing a Key Lookup. Let me explain it with an example. NOTE: I am using AdventureWorks2016 database.HERE IS THE QUERY:
SELECT SalesOrderID, OrderQty, UnitPrice FROM SALES.SalesOrderDetail WHERE OrderQty>1 AND ProductID = 877 AND CarrierTrackingNumber IS NULL; WHY WE NEED A COVERING INDEX FOR THE ABOVE QUERY: * As per the business requirement, majority of our focus is onproduct number 877.
* 90% of the cases we are fetching data based on the same predicate (OrderQty>N AND ProductID = 877 AND CarrierTrackingNumber IS NULL). * OrderQty is a variable (1 to N). * We are using the same condition/predicate in 8 different procedures. On and average this condition hits 10 times per minute. HOW TO DETERMINE THE INDEX COLUMNS? ORDERQTY: As per the requirement, it’s a variable passed at runtime. Value is between 1 to N. Since it’s a predicate/where/condition we should keep it in Key columns. PRODUCTID: Since 90% of the queries are fetching data only for the product 877, we can have a filtered index that cover this particularscenario.
CARRIERTRACKINGNUMBER: Like ProductID, we can have a filtered index onthis column.
SALESORDERID: Since it’s part of the PRIMARY KEY we need not fetch it separately. Primary key columns are available in all non-clustered indexes by default. Thereof, no need to get it separately. UNITPRICE: This is the only column where we are not covering either in index key or in filter. Hence we need to add this column to index. Since we do not have any predicate on it and we are just fetching data, we can add it to INCLUDED list. WE ARE COVERING ALL COLUMNS FOR THE ABOVE GIVEN QUERY. NOW, LET’SCREATE THE INDEX:
CREATE NONCLUSTERED INDEX Custom_NIX_SALES_SalesOrderDetail_OrderQty_ProductID_877_CarrierTrackingNumber_ISNULL ON SALES.SalesOrderDetail (OrderQty)INCLUDE (UnitPrice)
WHERE ProductID = 877 AND CarrierTrackingNumber IS NULL; CREATE THE ABOVE INDEX, EXECUTE THE QUERY AND SEE WHAT WILL HAPPEN:RESULTS:
Surprising, you are covering all columns from the given query. But, still it’s doing the clustered index scan. We’ll force it to use the newly created index, then only we’ll come to know the reason. FORCE THE QUERY TO USE THE COVERING INDEX:RESULTS:
* Even we are covering all columns, you can see that it’s doingthe Key Lookup.
* When you check it, the Key Lookup is happening to get the matching values for the predicate “CarrierTrackingNumber IS NULL” * Covering index that we’ve created is already having the filter “CarrierTrackingNumber IS NULL”. But, why it’s not using thatindex?
WHY A FILTERED INDEX ON NULL VALUES IS STILL DOING A KEY LOOKUP? * When we are creating the filtered index on a value (ProductID = 877), it’s working fine. But, when are doing the same with “IS NULL” it’s not working. * I am still unable to find the root cause. * But, boss (Microsoft)
is saying it doesn’t work, also suggested the resolution.* Here
,
you can find Microsoft take on this issue.* Microsoft
is suggesting the below resolution: “_TO RESOLVE THIS ISSUE, INCLUDE THE COLUMN THAT IS TESTED AS NULL IN THE RETURNED COLUMNS. OR, ADD THIS COLUMN AS INCLUDE COLUMNS IN THEINDEX_“
RESOLUTION:
* Add the column in include columns. * Drop and recreate the index by adding this column in INCLUDE columns list and rerun the query.RESULTS:
You can clearly see that, by default the query started using the covering filtered index without any key lookup.PERFORMANCE TEST:
We’ll test the performance of the query by comparing with CLUSTERED INDEX SCAN and the covering NON-CLUSTERED INDEX seek. PERFORMANCE IMPROVEMENTS:SUMMARY:
* “Filtered index” is really useful when you want to customize and narrow down the data usage and it works like a magic with the minimized index maintenance cost. * When you are creating a filtered index on IS NULL condition, be aware that we need to include the same column. * Filtered Indexes in SQL Server is an awesome feature. But, Terms and Conditions applied. * Below are the few interesting articles that describes more side effects of Filtered Indexes An Unexpected Side-Effect of Adding a Filtered Index by Paul White A-Z of Filtered Indexes with examples in Sql Server by BasavarajBiradar
What You Can (and Can’t) Do With Filtered Indexes by Brent Ozar Posted in Performance Tuning, SQL
Development |
Tagged performance tuning, sql server
| 2 Comments
SQL SERVER PERFORMANCE TUNING USING FILTERED COVERING INDEX Posted on September 2, 2019by uday arumilli
SQL Server Performance Tuning using Filtered Covering Index takes you through a simple scenario where filtered indexes are helpful to improve the performance of frequently used queries. Before starting, I assume that you know “WHAT” a filtered index is or have a look athere
.
Filtered indexes are very helpful to cover frequently used queries with the minimized index size and maintenance cost. Lets consider a simple scenario as below: NOTE: I am using the database Let’s say we have a query to fetch order details for a specific product (870). The same query has been getting called 8 to 10 times per minute. Now, our job is to improve the query performance: SELECT SalesOrderID, OrderQty, UnitPriceFROM .
WHERE OrderQty > 2 AND ProductID = 870;ANALYSIS:
It’s just a simple query and it’s fetching SalesOrderID, OrderQty and UnitPrice for the Product 870 where OrderQty is greater than N(N is a variable). Before looking into the improvement aspects first we’ll see the execution plan and write down our observations: SWITCHING OFF ROW COUNT’S AND ON STATISTICS:OBSERVATIONS:
* Total Logical Reads: 39875 * Clustered Index Scan is happening with Parallelism* From Tool Tip:
* Object (Index is being used): PK_SALESORDERDETAIL_SALESORDERID_SALESORDERDETAILID * Output List (Columns Fetching): SALESORDERID, ORDERQTY andUNITPRICE
* Predicate (Condition): ORDERQTY > 2 AND PRODUCTID = 870 FIND THE SOLUTION FOR IMPROVEMENTS: DO WE REALLY NEED AN INDEX HERE?ANS:
Yes, we need any index as the same query is getting called for 8 to 10 times per minute. Also, we could see high on logical reads. HOW TO DECIDE THE INDEX KEY COLUMNS?ANS:
Your queries where clause can answer this question. Predicate is OrderQty > 2 AND ProductID = 870. Now, it’s clear that we need to choose OrderQty AND ProductID are the key columns of the index. INDEX (PRODUCTID, ORDERQTY). But, as per the business requirement OrderQty is a variable which means its value may get changed from time to time. But, productID is 870 only as our business focus is only on specific product 870. Since ProductID = 870 is constant and the same query is getting used widely, we can apply the same FILTER ON INDEX:INDEX (ORDERQTY)
WHERE PRODUCTID = 870. We determined the key columns also, applied the required filter on it. Now, we will create an index and see how it works. CREATE INDEX AND TEST IT: CREATE NONCLUSTERED INDEX Custom_NIX_Sales_SalesOrderDetail_OrderQty_ProductID_870ON . (OrderQty)
WHERE ProductID = 870; SURPRISING, isn’t it? We’ve created a filtered index that exactly covers the query. But, still it’s doing the clustered index scan. Why it’s not using the index that we have created? Let’s force it to use the index that we’ve created. Then, we’ll come to know why it’s not a proper index: * From the above images you can clearly see that why optimizer didn’t choose the newly created index unless you forced it. * It’s not being used as it’s not the optimized plan. We can see that it’s creating “WorkTable” a temp table on TempDB. * Also, the Key Lookup is happening for the column “UnitPrice” and it’s taking the 97% of cost. For each row filtered in Index Seek a Key Lookup is running for the corresponding UnitPrice. * Also, we can see the number of executions in Key Lookup is 11552. You have created an index but still the problem is not resolved yet. How to fix and improve it? DRAW THE CONCLUSION: * If we can remove the Key Lookup then optimizer surely chose the covering filtered index that we created as a solution. * Remove the Key Lookup by including the column “UnitPrice” asbelow:
CREATE NONCLUSTERED INDEX Custom_NIX_Sales_SalesOrderDetail_OrderQty_ProductID_870ON .(OrderQty)
INCLUDE (UnitPrice)
WHERE ProductID = 870;TEST THE SOLUTION:
After adding the included column, you can see the optimizer started using the newly created index: NOW, COMPARE THE EXECUTIONS BETWEEN CLUSTERED INDEX SCAN AND NEWLY CREATED NON-CLUSTERED FILTERED INDEX SEEK: PERFORMANCE IMPROVEMENTS: We could see the improvement of 97% in CPU and 99% in IO. This is all we are just talking about one execution. If you can calculate the average improvement based on number of executions per a given day, it’ll be huge and you can project the same to your end customer.SUMMARY:
* Always chose the right candidate for the right position (Key Column, Filtered Column and Include column). * Costly Key lookups are the first thing to be removed from yourexecution plans.
* Always consider the data growth percentage in production whiledesigning an index.
* Filtered indexes are really helpful for more frequent queries based on a constant conditions as it reduces the index storage which in-turns reduces the maintenance. * Post SQL Server Performance Tuning using Filtered Covering Index can help you to understand the basics of covering filtered index usage in real time production environment. Posted in Performance Tuning, SQL
Development |
Tagged sql server | 1Comment
CLUSTERED INDEX ON UNIQUEIDENTIFIER COLUMN Posted on April 18, 2019by uday arumilli
Hello all,
It’s been a year since we posted a blog. It’s been the busiest year of my life. However, we strongly believe that learning is a journey and it should be a continuing process. Coming to the point, recently I had to handle a customer problem with the overall application performance. Found some interesting problems and thought of sharing the same. CLUSTERED INDEX ON UNIQUEIDENTIFIER COLUMNPROBLEM STATEMENT:
Clustered Index on UNIQUEIDENTIFIER column takes you through high-level problems with the GUID. We have a crucial database environment where we were facing some performance issues. We identified a few issues fixed them. While analyzing the overall database architecture, we observed a few interesting facts which are highly impacting the database performance. One of the major observations is having a clustered index on UNIQUEIDENTIFIER column on Transactional tables where we are seeing a lot of writes on those tables. When we captured the statistics below are the observations: 1. Index Rebuild is happening on Sunday afternoon 2. Index fragmentation (Index on UNIQUEIDENTIFIER) is reaching 65% byMonday afternoon
3. We do not get any maintenance window during the week as the application is running in 24X7 4. We are using the same fragmented index during the week tillSaturday
5. On that clustered index Bad Page Splits Per Second is high > 38% of Batch Requests Per Sec 6. These indexes are being highly used across the application for both WRITES and READS An expert from the customer side asked us to brief our analysis and the generic information on why clustered index on UNIQUEIDENTIFIER is creating the problem and the possible solutions. Here is our analysis and the solution suggested. Continue reading → Posted in Database Design, Performance
Tuning , SQL
Development |
Tagged clustered index ,guid , index tuning
, indexes
, uniqueidentifier
| 2 Comments
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