Questions tagged [columnstore]

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40 views

Clustered columnstore index on small tables

Clustered column store indexed tables in general are useful for large tables. Ideally with million of rows. And also useful with queries, which selects only the subset of available columns in such ...
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1answer
44 views

Could database with compat level 100 support columnstore index?

I have an instance which runs on SQL Server 2017 Developer Edition instance. I restored database ContosoRetailDW which had compatibility level 100. After restore operation, I run the following query: ...
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1answer
11 views

Does binary logging apply to ColumnStore?

When binary logging is enabled, does MariaDB's binary logging also record ColumnStore events, and not just InnoDB events? For example, does it log an UPDATE made to a ColumnStore table row? I've ...
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2answers
29 views

Why am I getting error 35353 when enabling CDC on a table with a CCI?

I'm trying to enable Change Data Capture on a table with a clustered columnstore index, a unique non-clustered index, and a non-unique non-clustered index in SQL Server Standard 2019. The command ...
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1answer
87 views

Eliminate filter operator before columnstore index scan operator

I have a large fact table with millions of rows called MyLargeFactTable, and its a clustered column store table. There is a composite primary key constraint on it there as well (customer_id,...
3
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1answer
56 views

Row vs Columnar DB for queries with multiple OR statements

I understand columnar databases are great for speed queries where you don't use many fields to lookup against, but what if you only used OR statements? For instance, I want all the records that have (...
7
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2answers
436 views

Does it make sense to add indexes to a clustered columnstore index table?

Question is similar to this one, but the answer doesn't seem to answer this question. My understanding of a clustered columnstore table (and please correct me if I am wrong) is that each column is ...
1
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1answer
47 views

Azure tempdb filling up while trying to convert a large table to columnstore… how to mitigate?

I have a large reporting table (approx 6B rows) taking up roughly 400GB of storage on an azure sql db. I've been trying to convert it to a columnstore table using the following commands: insert Logs(...
5
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1answer
135 views

Can adding a columnstore index to a table affect read performance of a query that uses a rowstore index on the same table?

I'm doing some testing of columnstore indexing on a single table that has about 500 million rows. The performance gains on aggregate queries have been awesome (a query that previously took about 2 ...
0
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1answer
68 views

Recommendations about deleting large set of rows in MSSQL [closed]

I need to delete about 75+ million rows from a table everyday that contains around 3.5 billions of record. Database recovery mode is simple, I have writen a code that deletes 15.000 rows in a while ...
1
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1answer
58 views

If a rowstore index is stored in a b-tree data structure, what kind of data structure is used for a columnstore index? [duplicate]

My understanding of how regular rowstore indexes are stored is in a type of b-tree data structure, but I was wondering because of the different nature of columnstore indexes, what type of underlying ...
3
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1answer
67 views

How to control Segmentation min/max data_id on a non-clustered ColumnStore index

Given a simple row-based table without a PK but with a row-based clustered index like so: create clustered index [CX_PropertyValue] ON [dbo].[PropertyValue] ([PropertyId], [Value]) Then I wish to ...
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1answer
33 views

Do I still need OLAP cubes after a SQL Server Upgrade

After our DBA got sacked for poor performance, I am now our accidental DBA. I have been pushing to upgrade our SQL Server instance from 2012 to 2017 so I can use the clustered column store indices in ...
2
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1answer
149 views

Adding COMPRESSION_DELAY to an existing COLUMNSTORE INDEX

When I create an COLUMNSTORE index I can specify COMPRESSION_DELAY = x [minutes] in the CREATE-Statement. It delays the movement of the rows in an closed segment from the delta store to the compressed ...
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0answers
24 views

Reorganizing columnstore index on uncomitted rows

I want to add a non-clustered columnstore index to the table table_with_csi. The following code runs every day and inserts big amounts of data into the table. Where should I add the reorganize ...
21
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3answers
861 views

Why would a table with a Clustered Columnstore Index have many open rowgroups?

I was experiencing some performance issues with a query yesterday and upon further investigation, I noticed what I believe is odd behavior with a clustered columnstore index that I'm trying to get to ...
2
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2answers
1k views

Columnstore Index maintenance and finding fragmentation

We are using clustered columnstore indexes and partitions in SQL Server 2014. Some tables have a lot of updates and we find ourselves with a lot of deleted rows for some partitions. In our tests, a ...
0
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1answer
11 views

Redshift: Performance wise Is storing delimited values in a single column ever preferable to normalizing them out to another table?

I have been looking at increasing the performance of some tables that have been uploaded to a redshift database. One of the columns in a table has many delimited values which need to be split out and ...
0
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1answer
394 views

Do I still need to disable or drop column store index before insert and/or update on big tables?

As the title says, I thought that from MSSQL 2016 I don't really have to drop or disable ColumnStore indexes before ETL and rebuild it after. Any consensus?
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1answer
123 views

Table with Clustered Columnstore Index bigger than a Clustered Rowstore Index

We have a query that is doing an index scan on a 36 million row table that has a Clustered Columnstore Index. All the cost of the plan is pretty much on the index scan of this Clustered Columnstore ...
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2answers
353 views

Lob Logical Read and lob read-ahead reads in NCCI [duplicate]

I have a test table with following structure. CREATE TABLE [dbo].[DW_test]( [ID] [bigint] IDENTITY(1,1) NOT NULL, [CourtCaseID] [int] NOT NULL, [ActionID] [int] NOT NULL, PRIMARY KEY CLUSTERED([ID] ...
4
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1answer
163 views

MSSQL - How to support aggregate pushdown on indexed view with SUM(decimal)

I have an indexed view with non-clustered columnstore index, e.g. CREATE VIEW [dbo].[SalesAggregated] with schemabinding AS SELECT BusinessDate, ItemId ,...
10
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2answers
777 views

How to Prevent Partitioned Columnstore Deadlocks on SELECT

I have three Clustered Columnstore Index (CCI) tables in SQL Server 2016. All of these CCIs are in the same partitioning scheme, based on Tenant ID. Lately, and inconsistently, I am getting deadlocks ...
6
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1answer
367 views

Slide Partition from Rowstore to Columnstore

I have a rowstore table which contains ~10 billion records. The table is partitioned on an INT field and has about 1,400 active partitions. I also have a clustered columnstore table built on the same ...
2
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1answer
217 views

Storing Social Security Number as DECIMAL(10,9) for Columnstore

I am working on a VERY large database (10B + rows) that performs matching on SSN and BirthDate to try and find duplicate records. The table is using columnstore compression (SQL SERVER 2016) and it ...
2
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3answers
364 views

Database solution for a large matrix/very wide table

Suppose I have these two data frames (simplified for my question): users +---------+ | user_id | +---------+ | 1 | | 2 | | ... | +---------+ articles +------------+------------+ | ...
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1answer
347 views

Performance Metrics: Columnstore Indexes vs SSAS Cubes [closed]

What has faster performance speed: Columnstore Indexes or SSAS Cubes? Are Columnstore indexes proven to be faster than SSAS cubes (SQL Analysis Services)? Have their been any performance studies ...
10
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3answers
506 views

Filter condition not correctly applied to Clustered Columnstore index

Using the below example, the predicates are the same, however the top statement (correctly) returns 0 rows, the bottom statement returns 1 - even though the predicates do NOT match: declare @barcode ...
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0answers
44 views

MS SQL 2017: Generate estimate execution plan take more than 3 min

Sometimes generate Execution Plan (estimated) for simple query take ~3min Query: SELECT MAX(field) FROM table_name WHERE Org = x and PartKey = y The table is columnstore cluster index SQL Server ...
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1answer
82 views

Does Batch Mode only apply to Agg Functions on ColumnStore Index

Azure SQL Database - Standard Edition (S3 Service Tier) Why does Batch Mode only come into effect when using Aggregate Functions? DROP TABLE IF EXISTS dbo.TransCS CREATE TABLE dbo.TransCS ( ...
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1answer
611 views

Columnstore index for Key/Value Pair table on SQL Server

I need to build a database for storing assessments. Each assessment can have an indefinite number of questions, and an indefinite number of responses. Responses for each assessment can grow up to ...
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1answer
131 views

Column store index for on premise Kimball Data Warehouses

Are column store tables now the vendor default method for Kimball Data Warehouse tables with Dim and Facts for On Premise? I know in the cloud, Microsoft automatically recommends Azure Data warehouses ...
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1answer
47 views

MariaDB Columnstore unexplained behaviour using CASE

We were updating column value based on col 'string_hash_id' value, but we couldn't get through: Error Code: 1815. Internal error: CAL0002: Update Failed: TreeNode::getDecimalVal: non-support ...
2
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1answer
73 views

Microsoft Column Store Database?

Using Microsoft technologies/products is it possible to create a column store database with column family sets? That is each row being able to have a different number and type of columns. Colmun ...
4
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1answer
467 views

SELECT from Clustered Columnstore results in LOB Reads

I am performing a SELECT from the following Clustered Columnstore Index which contains 5.2 Billion Records. When I review the output of STATISTICS IO, I am seeing LOB Logical reads. My question is ...
8
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2answers
563 views

How many partitions should I make for my clustered columnstore index tables? Should I partition the rowstore tables also?

I have a data warehouse comprised of four clustered columnstore index tables (CCI) and nine rowstore tables. These tables are used only for analytics and the CCI data is inserted from staging tables ...
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1answer
467 views

Is there any Performance Issue joining Row based Table to Clustered Columnstore Index Table [closed]

Is there any Performance Degradation joining Row based Table to Clustered Columnstore Index Table? Does SQL Server have any guidance for or against this? We have a table that is 2 million rows, and ...
1
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1answer
1k views

How Large Table before Using Clustered Columnstore Index

At what size should we consider applying Columnstore Index on a table? Is there a SQL Server storage or design guidance? Our Data Warehouse is 5TB total. Additionally, we have tables which are 100GB ...
2
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1answer
379 views

Difference between Clustered Columnstore Index Table in Azure SQL and Table in Azure Data Warehouse

What is the essential difference between a Clustered Columnstore Index table in Regular Azure SQL, and a table in Azure Data Warehouse? They both have columnar storage, no foreign keys, no primary ...
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2answers
2k views

Can a table have Both a Clustered Columnstore Index and Nonclustered Columnstore Index?

Can I a table have both Clustered Columnstore Index and Nonclustered Columnstore Index? I am seeing example strategies to use Clustered Columnstore Indexes with only Nonclustered Binary row indexes. ...
12
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1answer
233 views

Why does batch mode window aggregate yield arithmetic overflow?

The following query performs a windowed SUM over a columnstore table with 1500 total rows, each of which has the value 0 or 1, and it overflows the INT data type. Why is this happening? SELECT a, p, ...
2
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2answers
277 views

Performance Implications of encrypted data in a Clustered Columnstore Index

I am using SQL Server 2016 and expecting some details on below points regarding performance point of view: Is there any performance gain or additional benefit on creating a primary key - unique ...
4
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1answer
426 views

How to drop an in-memory temporal columnstore

Consider the following: CREATE DATABASE [Foo] ALTER DATABASE [Foo] ADD FILEGROUP XTP CONTAINS MEMORY_OPTIMIZED_DATA ALTER DATABASE [Foo] ADD FILE (NAME=XTP,FILENAME='C:\Program Files\Microsoft SQL ...
3
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1answer
826 views

How Ola Hallengrens Index maintenance scripts handles columnstore indexes?

I'd like to know how Ola's script handles columnstore indexes. Couln't find any information about that, only in the version history it was mentioned that script does have a support. My experience is ...
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2answers
67 views

Will table partitions help me?

I have 10 tables. dbo.Table2008 dbo.Table2009 ... dbo.Table2018 Each table holds approximately 500,000,000 records which are 20 columns wide (if that matters). And each table has a clustered ...
6
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1answer
939 views

Clustered columnstore index space usage

I have a simple table with a clustered columnstore index: ID INT NOT NULL, Hash BINARY(20) NOT NULL This table has some billion rows and according to sp_spaceused, sys.allocation_units and SSMS ...
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2answers
122 views

Why are column store databases the new thing now? [closed]

Column store databases have several advantages over traditional databases - most notably compression and faster seek. Column store seem to be the new fad for databases in the past few years, with HANA ...
15
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2answers
373 views

Columnstore Index in read_only filegroup prevents CheckDB

It appears setting a filegroup to read_only prevents dbcc checkdb for the entire database if the filegroup contains a columnstore index. When attempting to run checkdb or checkfilegroup (for any ...
1
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1answer
47 views

select runs in batch mode, but CTAS runs in row mode

I have the same query that shows as running in batch mode when run as a select statement, but row mode when the same query is the select part of a CTAS operation. Both tables (plus the resulting table)...
3
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2answers
134 views

Can I artificially limit the Columnstore cache size in SQL Server?

I am trying to evaluate the potential performance of a data science workload on a large-ish dataset (~200GB). We have had excellent results using columnstore indexes in SQL Server 2017. However, the ...