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How to change default compression mode in mariaDB Columnstore?

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jonetta last edited by

In mariaDB there is a way to disable columnstore compression in session level (and set the disable flag in each session). Is there any way to change the default compression mode?
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tahishae last edited by
I don't know the details of INSERT in Columnstore, but I would suspect the following:
- Inserting one row is quite costly.
- The code will consider the tradeoffs when adding more data row-by-row
- Probably: Batch inserting (especially of 64K or more rows) is better optimized.
So... How fast are you inserting rows? Are they being inserted in clumps? What I might do is to gather rows until
- I have collected X rows, OR
- Y minutes have passed
After whichever of those happens, then I would do a batch insert.

X might be 10K; Y might be 20 minutes. But those depend on the desired performance characteristics of the application.

(For InnoDB, I recommend batches of 100-1000 or 1MB of gathered Insert text. This runs about 10 times as fast as one-row-at-a time.)
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I don't quite understand what your table looks like, but you can just ask for the sum of all the lines of a certain field. SELECT SUM('price') FROM subscriptions WHERE date>=1The primary level request is working, and it's the only thing I could write on the basis of your description.
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MySQL server in Arch Linux replaced by MariaDB. It's MySQL server.Remove MySQL and MariaDB interfere with dependence.Perhaps you've forgotten to launch the base:mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql mysql_secure_installation And launch a demon:systemctl enable mysqld systemctl start mysqld We can read more detail. https://wiki.archlinux.org/index.php/MySQL_(%D0%A0%D1%83%D1%81%D1%81%D0%BA%D0%B8%D0%B9) ♪
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When you don't provide any location,SQL Server by default uses server level settings which are provided during installation.What this means is if you don't provide any location while creating database,SQL uses this location by default..This can be changed at any time and can be found here Further while creating a database,You also can provide location like below,if you want any database to be created at different location CREATE DATABASE [sdsd] ON PRIMARY ( NAME = N'sdsd', FILENAME = N'new path ' , SIZE = 2048KB , FILEGROWTH = 1024KB ) LOG ON ( NAME = N'sdsd_log', FILENAME = N'new path' , SIZE = 1024KB , FILEGROWTH = 10%) GO If you are looking to change the existing database location,here is an answer which goes in depth .. How do I attach a database in SQL Server?
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I'm not sure you can automate this in SSMS. Why not take the opportunity to learn a little SQL? The script below will create a table with ID as the primary key (int) - you can then just add the extra columns you need (refresh your table list first): CREATE TABLE [dbo].[your_table_name]( [ID] [int] NOT NULL, CONSTRAINT [PK_your_table_name] PRIMARY KEY CLUSTERED ( [ID] ASC ))
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The first approach is to create an index by sessionId. But its datatype is MEDIUMTEXT... So the approach is: normalize your data, move sessionId values into separate table and refer to it by foreign key. The reference column will be compact (4 or 8 bytes) and indexed, so its usage in the query as GROUP BY expression will improve. The columns clientID and stage seems to be candidates to such normalization too.

How to change default compression mode in mariaDB Columnstore?

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