SQL 2012 :: Disabling Column Store Index And Try Loading Data
Oct 17, 2015
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.
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Aug 20, 2015
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 ?
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Jun 18, 2015
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.
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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
[Code] ....
what's the correct syntax
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Nov 9, 2014
We are storing changed data of tables into XML format for auditing purpose. The functionality is already achieved. We are using FOR XML Path clause to convert relational data of tables into XML format.
Now, a table is having column name with '(' . For example name of the column is, ColumnName(). In this case we can not convert into XML using For XML clause. Showing error as,
Column name 'columnName()' contains an invalid XML identifier as required by FOR XML; '(' (0x0028) is the first character at fault.
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Dec 7, 2005
Greetings,I want to bulk load data into user defined SQL Servertables. For this i want to disable all the constraints on all the userdefined tables.I got solution in one of the thread and did the following:declare @tablename varchar(30)declare c1 cursor for select name from sysobjects where type = 'U'open c1fetch next from c1 into @tablenamewhile ( @@fetch_status <> -1 )beginexec ( 'alter table ' + @tablename + ' check constraint all ')fetch next from c1 into @tablenameenddeallocate c1goNow when i try to truncate one of the tables (say titles) it gives methe following error:Cannot truncate table 'titles' because it is being referenced by aFOREIGN KEY constraint.Can anyone show me the right path? I am working on ASE 12.5TIA
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May 23, 2006
Hi Champs
I am importing huge amout of row into a DW, that I then want to build Cubes from.
This process is slow, as SQL insists of concurrently building an index, whil loading.
Is there a possebility to delay the build of Index to After the data is loaded into the DW?
/Many thanks
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Nov 3, 2015
What are the disadvantages of columnstore index in Sql Server 2012
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Oct 20, 2015
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?
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Apr 3, 2015
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.
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Sep 17, 2015
How can we get the list of clustered columnstore index in a database in sql server 2014
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Oct 9, 2015
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?
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Mar 26, 2007
Hi
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?
Regards
SanjaySi
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Dec 16, 2014
We have a table with 10 columns each column is of datatype int and can accept nulls, when I do a save is it better to have 0 inserted in to the column or just insert null?
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Sep 10, 2007
Hi i am trying to do a straight forward load from a Flatfile source , i have defined the columns according to the lenghts defined in the Data Dictionary Provided but when i am trying to run the Task i am encounterring this error
The column data for column "Column 20" overflowed the disk I/O buffer.
I tried to add another column 21 at the end and truncate or leave that column unmapped to destination but the same problem occurs for column 21 what should i do to over come this .
In case of Bad Data how to clean up the source.. Please help me with this
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May 5, 2014
I have a question regarding indexes.
If i have cluster and NC index on same column,does it degrade performance on DML statements ? any advantage on select statements.
Is it good to have both indexes on same column ?
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Jan 15, 2015
We have a large table with many columns and many indexes. One poorly performing query is having to do a key lookup when the where clause includes a particular column with no covering index.
Are you generally better off adding a new index or adding the column to an existing index ( included columns )Column: LAST_STATE_RESPONSE_CODE
The Query Processor estimates that implementing the following index could improve the query cost by 88.9332%.
*/
/*
USE [ database name]
GO
CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>]
ON [dbo].[SERVICE_REQUEST] ([BUSINESS_PROCESS_STATUS],[[color=#F00]LAST_STATE_RESPONSE_CODE[size="3"][/size][/color]],[CONCRETE_TYPE])
INCLUDE ([LIENHOLDER_PERFORMING_LIEN_FILING_ID],[MAKE],[YEAR],[MANUFACTURER_ID],[CLIENT_ID])
GO
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Apr 16, 2015
Is it always the best practice to have the partition column also as the column for clustered index?
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Oct 29, 2014
I'd like to create a table that will store different order items. Several order items make up one single order. Order items can have 0 or more children (max depth will never be deeper than one). Order items can have up to 150 attributes/values. The way I think this should be done is using XML column instead of the EAV type of model. My table structure currently looks like this:
* child_order_item_id (PK)
* parent_order_item_id (FK to child_order_item_id)
* order_id (FK to Order table)
* product_id (FK to Product table)
* price
* attribute_XML
How my attribute_XML should look like or how to validate the xml.
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Sep 3, 2015
I just joined a bank related IT department where the existing IT team is already working on creating a new application since a year now and designed database on SQL Server 2012, the amount (currency related) column's datatype found different in tables some where it is decimal and somewhere found different. I want to suggest them Money datatype to choose where we are dealing with currency related columns. My question is, is that correct to choose Money datatype or should I ignore this?
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May 29, 2015
I am looking for a way to convert the following format into a sql table. The format it is Bib Tex.
Essentially a new row in the table would be for each entry, denoted by an @ logo and each column is denoted by an =, as you can see from the example data no one contains all the possible columns and some fields can be over two lines long.
To load this I was considering loading it into a table as each line being a row. Adding a row number, then a column counting the @ signs in order and essentially grouping each record, then for each group running through and looking for the column keywords 'author' , 'title' etc then splitting the data out into those constituent parts using substring and charindex.
@Book{hicks2001,
author = "von Hicks, III, Michael",
title = "Design of a Carbon Fiber Composite Grid Structure for the GLAST
Spacecraft Using a Novel Manufacturing Technique",
publisher = "Stanford Press",
year = 2001,
[Code] ....
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Jul 28, 2015
I’m looking for clearity on partition switching. The idea is to use many BULK INSERT statements into table dbo.X_n in parallel and when BULK INSERT for table dbo.X_n is completed, switch dbo.X_n into dbo.bigdaddy. I think this is the fastest way to upload a couple hundred GB of data.
In learning about partition switching (in part) from The Data Loading Performance Guide under Partition SWITCH, I hear the instructions to say copy the main table exactly to become a target. But in that same step (#1), I read that we need to change the default file group of the target (dbo.X_n) from the default file group. Then it says I need to match indexes and lists the filegroup as something we need to match with the main table.
As an overview of the partition switching strategy, I think the whole point of BULK INSERT with partitioning is to have seperate files (in same group) to enable concurrent uploading where each table has its own file. Once the upload is completed to a table (dbo.X_n) then we do the partition switch into the main table (dbo.bigdaddy). The data we just uploaded doesn’t actually move, just the metadata for it.
“Don’t have the same filegroup on your target as the main table. You must have the same filegroup on your target as the main table.”
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Sep 18, 2015
We have a table to 100M rows and up until now we were fine with an non clustered index a varchar(4000) because we never went above 900 bytes (yes it is a bad design).We have the need to support international character sets now so the column was updated to nvarchar(4000) and now we have data past the 900 byte limit.
The data is long, seems useless but is needed by the business and they need to be able to search "where bigcolumn like 'test%'". With an index, even with a huge amount of data, it was 'fast'. Now of course without an index it is unusable. The wildcard is always at the end of the search. I made a full text index on the column and basic queries such as: select * from ourtable where contains(bigcolumn, 'AReallyLongStringofTextHere') works fine unless there is a space in the data. We loose thousands of returned rows because of spaces in the data.
I have tried select * from ourtable where contains(bigcolumn, '"AReallyLongStringofTextHere that includes spaces"') but not all of the data is returned. I get 112 rows with the contains statement. The table scanning statement of "select * from ourtable where bigcolumn like 'AReallyLongStringofTextHere that includes spaces%' returns 1939 rows.I understand that a full text index is breaking the long string up since it contains spaces. Is there a way to retain the entire string as 1 index entry or is there a way to fix my query to return all of the rows?
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Jul 17, 2006
I am loading data from an external source into SQL Server via ASP.NET/C#. The problem is that I do not necessarily know the data types of each column coming in, perhaps until a user tells the application, which might not occur until after the data is loaded. Also, I cannot anticipate the number of columns coming in. What would table design look like?
Would you use a large table with enough columns (e.g. Column1, Column2, etc.) reasonable enough to accomodate all the columns that the source might have (32?), and use nchar as the datatype with the plan to convert/cast when I use the data? Isn't the cast kind of expensive?
Does this make sense? Surely other foplks have run into this....
My thanks!
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Aug 26, 2014
We are planning to upgrade. We are using Sql 2008R2 now. Which is the better option migrating to SQL 2012 or migrating to 2014?I am thinking 2014 has memory optimized tables and updatable column stored index. So it is better option.
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Sep 22, 2015
I'm trying to improve the loading of some tables with large amounts of data that forms part of an ETL. I was going to try removing any indexes before the inserting to speed up the process, but I had some questions on whether or not I should include the clustered index (assuming one exists).
I was originally planning on including a step to disable all indexes on the destination table using the following:
ALTER INDEX ALL ON MyTable DISABLE
Once the load had finished I'd simply rebuild all the indexes.
should I simply disable the non-clustered indexes?
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Oct 17, 2014
I am looking to store the different forms and data in our database. We have several different forms and contains different information. I am looking for different approaches to model this table structure.
Also, I need to make sure the table structure will allow for new forms.
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Nov 13, 2014
In one store procedure I do insert same data into two tables (They have the same structure): OrderA and OrderB
insert into OrderA select * from OrderTemp
insert into OrderB select * from OrderTemp
And then got an error for code below.
"Multi-part identifier "dbo.orderB.OrderCity" could not be bound
IF dbo.OrderB.OrderCity=''
BEGIN
update dbo.OrderB
set dbo.orderB.OrderCity='London'
END
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Jan 29, 2006
I have xml string that needs to be stored in a field in the DB. I was looking for recommendations for the data type I can use in such a scenario.
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Oct 13, 2014
A DB2 store procedure returns two data sets, when executed from SSMS, using linked server. Do we have any simple way to save the two data sets in two different tables ?
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Jun 8, 2015
I recently set up a SQL 2012 FCI with a NetApp fileshare to store the data files. The install worked just fine, but I can't run an integrity check for any of my databases. Whenever I try, I get these error messages:
Msg 1823, Level 16, State 2, Line 1
A database snapshot cannot be created because it failed to start.
Msg 1823, Level 16, State 8, Line 1
A database snapshot cannot be created because it failed to start.
Msg 5120, Level 16, State 104, Line 1
Unable to open the physical file "path-to-fileshareMSSQL11.MSSQLSERVERMSSQLDATAmodel.mdf:MSSQL_DBCC12". Operating system error 1: "1(Incorrect function.)".
Msg 7928, Level 16, State 1, Line 1
The database snapshot for online checks could not be created. Either the reason is given in a previous error or one of the underlying volumes does not support sparse files or alternate streams. Attempting to get exclusive access to run checks offline.The error message suggests SQL had a problem creating the snapshot, but I checked through some NetApp documentation for configuring SMB 3.0 for SQL.
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Dec 12, 2006
Hi,
I am creating an adhoc report using report builde in RS2005, now the created report has few columns and some if them have functonality of drillng diwn but is it possible to have a column where a particular column can not be drilled into >
prashant
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Sep 5, 2013
I am upgrading my application's SQL Server from 2008 R2 to 2012.
As discussed in the below URL I am able to see the Identity jump after I upgrade and the server is restarted.
Now since I cannot afford this and at this moment I do not have the time to create a sequence with NOCACHE and test it again I have to go ahead and add trace flag 272 in the start up parameter as this is the only solution which I can implement and even rollback without much hassles.
[URL] ....
What I got to know, this flag will disable the new feature of IDENTITY property that has been implemented as part of SQL Server 2012 and will make it work like it was doing in SQL Server 2008 R2.
But I want to know implementing this flag would impact any other feature or performance (except the performance of IDENTITY) of SQL Server.
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