Data Warehousing :: Creating A Table With Column Store Index?
Sep 26, 2015
I am trying to create a sample table in the Azure SQL Data warehouse but its giving me a syntax error Incorrect syntax near the keyword 'CLUSTERED'.
CREATE TABLE [dbo].[FactInternetSales]
( [ProductKey] int NOT NULL
, [OrderDateKey] int NOT NULL
, [CustomerKey] int NOT NULL
, [PromotionKey] int NOT NULL
I have table having around 100 million rows.Everyday we have an ETL process in which table will be trucnated and relaoded. Will creating a partition on the table increase the inserting speed?
I have created NONCLUSTERED index on table but my report is taking more time that's why i created columnstore NONCLUSTERED index on the same table but i have one query, if any table have row and column level index(same columns in index) . Which index query will consider.
We have a typical issue with Column Store Index, we have a procedure which does 2 activities - Switch & Reverse Switch
Switch: 1. Fetch the Partitions needed to be switched 2. Switch the data from Main Table to Switch table 2. Disable the Column store on Switch table
SSIS Package: 3. Load data to Switch (Insert / Update)
Reverse Switch: 4. Enable the Switch 5. Switch back the data from Switch table to Main table
Issue: Some time the Column store is not getting disabled, and the package fails complaining try disabling the Column store index and try loading data.
If we re-run the procedure, the column store gets disabled.
I am trying to create a clustered index on a View of a table that has an xml datatype. This indexing ran for two days and still did not complete. I tried to leave it running while continuing to use the database, but the SELECT statements where executing too slowly and the DML statements where Timing out. I there a way to control the server/cpu resources used by an indexing process. How can I determine the completion percentage or the indexing process. How can I make indexing the view with the xml data type take less time?
I have created two tables. table one has the following fields,
Id -> unique clustered index. table two has the following fields, Tid -> unique clustered index Id -> foreign key of table one(id).
Now I have created primary key for the table one column 'id'. It's created as "nonclustered, unique, primary key located on PRIMARY". Primary key create clustered index default. since unique clustered index existed in table one, it has created "Nonclustered primary key".
My Question is, What is the difference between "clustered, unique, primary key" and "nonclustered, unique, primary key"? Is there any performance impact between these?
I received this stored procedure that I modified to run on my system. Specifically, I only changed the database and filter text and left the rest alone. When I execute the stored procedure, I get the error:
Msg 515, Level 16, State 2, Procedure ObjectNotesInsert, Line 18 Cannot insert the value NULL into column 'RefRowPointer', table 'pSCI_App.dbo.ObjectNotes'; column does not allow nulls. INSERT fails. The statement has been terminated.
Here is the actual stored procedure I am running. I should add that I can execute each step and get results and if I hard code the resulting values into the procedure, the execution works.
USE [pSCI_App] GO /****** Object: StoredProcedure [dbo].[_JAMTestSp] Script Date: 09/21/2015 11:32:09 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON
I am trying to create a table that holds info about a user; with the usual columns for firstName, lastName, etc.... no problem creating the table or it's columns, but how can I "restrict" the values of my State column in the 'users' table so that it only accepts values from the 'states' table?
When we use Partition switch and load the data to a table, can we refresh the indexes for specific partition, so that we don't need to rebuild / refresh for complete is this possible ?
can you have constraints as such [CreateBy] [nvarchar](30) NOT NULL DEFAULT (suser_sname()),on a table that has a column store index in SQL Server 2012,2014, or 2016?
I've been asked to look at using Clustered Columnstore indexes for one of my tables. The table contains about 5 million records with about 50 columns. The max field size is a NVarchar(MAX) with max field length currently of about 4k characters. It's only about a gigabyte's worth of data. The table is about 50% R/W operations. Currently, we have multiple indexes with no clustered index due to some performance issues that happened in the past. I've been attempting to determine if it's even really worth it to switch over. I feel that the table is still fairly small with minimal columns and don't believe there will be any noticeable improvement over traditional indexing.
I have a large fact table spread across tens of partitions (appx. 1TB each). I found that the business does not need much of the columns in the table. So, as an optimization action, I decided to get rid of these un-needed columns.What is the efficient way to achieve this? Can I simply drop these columns from the table, or use a new table with the reduced structure?
I have a Fact Table with a ID column as Primary key and clustered index is created. And also I have 4 dimensions FK's of data type INTEGER. And finally, I have one aggregation measure in the Fact Table.
Now, my situation is How can I improve the speed of querying the fact table by creating any of the below indexes?
After the staging_temp data gets inserted into main table.my probelm is to handle such a file where number of columns are more than the actual table.
If you see the sample rows there are 4 column separated by "¯".but actual I am having only 3 columns in my main table.so how can I get only first 3 column from the satging_temp table.
I am putting together an invoice for my company. I have a text box describing each section of the invoice, followed by a table to list out the charges. I am using multiple tables based on what type of charge the client is receiving.
I would like to hide each section if there are no items purchased of that type. I can do this with the table using the expression "=CountRows() < 1", but I do not know how to refer to that table (call it Tablix1 for the sake of discussion) for the text box. I've tried using a ReportItems function as my basis, without success.
I am trying to use an indexed view to allow for aggregations to be generated more quickly in my test data warehouse. The Fact Table I am creating the indexed view on is a partitioned clustered columnstore index.
I have created a view with the following code:
ALTER view dbo.FactView with schemabinding as select local_date_key, meter_key, unit_key, read_type_key, sum(isnull(read_value,0)) as [s_read_value], sum(isnull(cost,0)) as [s_cost] , sum(isnull(easy_target_value,0)) as [s_easy_target_value], sum(isnull(hard_target_value,0)) as [s_hard_target_value] , sum(isnull(read_value,0)) as [a_read_value], sum(isnull(temperature,0)) as [a_temp], sum(isnull(co2,0)) as [s_co2] , sum(isnull(easy_target_co2,0)) as [s_easy_target_co2] , sum(isnull(hard_target_co2,0)) as [s_hard_target_co2], sum(isnull(temp1,0)) as [a_temp1], sum(isnull(temp2,0)) as [a_temp2] , sum(isnull(volume,0)) as [s_volume], count_big(*) as [freq] from dbo.FactConsumptionPart group by local_date_key, read_type_key, meter_key, unit_key
I then created an index on the view as follows:
create unique clustered index IDX_FV on factview (local_date_key, read_type_key, meter_key, unit_key)
I then followed this up by running some large calculations that required use of the aggregation functionality on the main fact table, grouping by the clustered index columns and only returning averages and sums that are available in the view, but it still uses the underlying table to perform the aggregations, rather than the view I have created. Running an equivalent query on the view, then it takes 75% less time to query the indexed view directly, to using the fact table. I think the expected behaviour was that in SQL Server Enterprise or Developer edition (I am using developer edition), then the fact table should have used the indexed view. what I might be missing, for the query not to be using the indexed view?
I have 5 million rows of table, and going to create Non Clustered Index for Datetime values column. Creating Non clustered Index on Datetime value column will affect performance or not.
I was going through the book by Kalen Delaney where she has mentioned the following paragpraph in Chapter 7 (Index Internals):
Many documents describing SQL Server indexes will tell you that the clustered index physically stores the data in sorted order. This can be misleading if you think of physical storage as the disk itself. If a clustered index had to keep the data on the actual disk in a particular order, it could be prohibitively expensive to make changes. If a page got too full and had to be split in two, all the data on all the succeeding pages would have to be moved down. Sorted order in a clustered index simply means that the data page chain is logically in order.
Then I read the book on SQL Server 2000 (on Perf Tuning) by Ken England. He says the clustered index stores data in physical order and any insert means moving the data physically. Also the same statement is echoed on the net by many articles.
What is the truth? How are really clustered index stored? What does physical order in the above statement really mean?
Hi i am new to using this sql server 2000....this is a very simple question to all u guys.....i am just in a learning stage...so any help from u guys is really appreciable....
i need to create a table customers with the following columns... identity column to self-populate as the primary key, joindate, leavedate, custcode, empID.
This is the one i tried: create table customers (id int primary key identity (1,1) not null, joindate smalldatetime null, leavedate smalldatetime null, custcode varchar (10) not null, empid int not null ) is tht code correct only??? and i also want the below one : Create indexes on the leavedate, custcode and empid columns.
how to create these indexes??? and wht happens when i create them(like is thr any advantage of creating indexes???)
CREATE TABLE [dbo].[A]( [AutoID] [int] IDENTITY(1,1) NOT NULL, [ProID] [int] NOT NULL, [LID] [varchar](12) NOT NULL, [EventID] [varchar](12) NOT NULL, [HEventID] [varchar](12) NULL, ) ON [PRIMARY]
How I should creating the appropiate index for this table?A few option that I think ok.
Opt 1 : creating a primary key on the autoID with create index . create non clustered index on ProID and EventID Opt 2 : create a primary key on the autoID with non clustered index . create clustred index on ProID and EventID . opt 3: create primary key on the ProID and EventID with clustered index.
I have read thru the article on the primary key, clustered and non clustered indexing. However when I want to applyied the indexing..I feel a bit lost.But among the 3 option.... what is the different..
In a Stored Proc I am creating the following temp table and index:
CREATE TABLE [dbo].[#ShipTo]( [Ship_to_Num] [int] NOT NULL, [Country_key] [nvarchar](3) NULL, CONSTRAINT [PK_ShipTo] PRIMARY KEY CLUSTERED ( [ship_to_Num] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY]
The stored Proc runs fine from "exec", but when you batch into a Job it gives the error that "PK_ShipTo" already exists! I even put in a drop table on #ShipTo, but the same effect.
i have created index for a temporary table and this script should used by multiusers.So when second user connecting to it is giving index i mean object already exists.
So what i need is when the second user connected the script should create one more index on temporary table.Will sql server provide any random way of creating indexes if the index exists already with that name??
Anyone know the syntax and function to create a self incrementing index whilst extracting data? I'm using the Derived Column tool. The extract will be a full extract everytime, not incremental. Thanks.
I've created initial indexes for my table for the fuzzylookup process. I clicked on "Maintained index" but I don't see any triggers created on the reference table.
Do I create the triggers to maintain indexes myself?
Does anybody know how to create these triggers in terms of schema_name, Data_Modification_Statements etc.?
Would it be "Alter index <index name> REBUILD command?
