Re: Number of columns per row for Composite Primary Key CQL 3.0
What is MM stands for? million ? Yup. No idea why I do that. cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 12/09/2012, at 11:25 AM, Data Craftsman 木匠 database.crafts...@gmail.com wrote: Hi Aaron, Thanks for the suggestion, as always. :) I'll read your slides soon. What is MM stands for? million ? Thanks, Charlie On Mon, Sep 10, 2012 at 6:37 PM, aaron morton aa...@thelastpickle.com wrote: In general wider rows take a bit longer to read, however different access patterns have different performance. I did some tests here http://www.slideshare.net/aaronmorton/cassandra-sf-2012-technical-deep-dive-query-performance and http://thelastpickle.com/2011/07/04/Cassandra-Query-Plans/ I would suggest 1MM cols is fine, if you get to 10MM cols per row you probably have gone too far. Remember the byte size of the row is also important; larger rows churn memory more and take longer to compact / repair. Hope that helps. - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 8/09/2012, at 11:05 AM, Data Craftsman 木匠 database.crafts...@gmail.com wrote: Hello experts. Should I limit the number of rows per Composite Primary Key's leading column? I think it falls into the same wide row good practice for number of columns per row for CQL 2.0, e.g. 10M or less. Any comments will be appreciated. -- Thanks, Charlie (@mujiang) 木匠 === Data Architect Developer 汉唐 田园牧歌DBA http://mujiang.blogspot.com
Re: Number of columns per row for Composite Primary Key CQL 3.0
On Wed, Sep 12, 2012 at 11:42 PM, aaron morton aa...@thelastpickle.com wrote: What is MM stands for? million ? Yup. No idea why I do that. I should note that some people use 1MM to indicate 1 million milion ie. 1 billion, so this might be doubly confusing for some ;) -- mithrandi, i Ainil en-Balandor, a faer Ambar
Re: Number of columns per row for Composite Primary Key CQL 3.0
Hi Aaron, Thanks for the suggestion, as always. :) I'll read your slides soon. What is MM stands for? million ? Thanks, Charlie On Mon, Sep 10, 2012 at 6:37 PM, aaron morton aa...@thelastpickle.com wrote: In general wider rows take a bit longer to read, however different access patterns have different performance. I did some tests here http://www.slideshare.net/aaronmorton/cassandra-sf-2012-technical-deep-dive-query-performance and http://thelastpickle.com/2011/07/04/Cassandra-Query-Plans/ I would suggest 1MM cols is fine, if you get to 10MM cols per row you probably have gone too far. Remember the byte size of the row is also important; larger rows churn memory more and take longer to compact / repair. Hope that helps. - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 8/09/2012, at 11:05 AM, Data Craftsman 木匠 database.crafts...@gmail.com wrote: Hello experts. Should I limit the number of rows per Composite Primary Key's leading column? I think it falls into the same wide row good practice for number of columns per row for CQL 2.0, e.g. 10M or less. Any comments will be appreciated. -- Thanks, Charlie (@mujiang) 木匠 === Data Architect Developer 汉唐 田园牧歌DBA http://mujiang.blogspot.com
Re: Number of columns per row for Composite Primary Key CQL 3.0
In general wider rows take a bit longer to read, however different access patterns have different performance. I did some tests here http://www.slideshare.net/aaronmorton/cassandra-sf-2012-technical-deep-dive-query-performance and http://thelastpickle.com/2011/07/04/Cassandra-Query-Plans/ I would suggest 1MM cols is fine, if you get to 10MM cols per row you probably have gone too far. Remember the byte size of the row is also important; larger rows churn memory more and take longer to compact / repair. Hope that helps. - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 8/09/2012, at 11:05 AM, Data Craftsman 木匠 database.crafts...@gmail.com wrote: Hello experts. Should I limit the number of rows per Composite Primary Key's leading column? I think it falls into the same wide row good practice for number of columns per row for CQL 2.0, e.g. 10M or less. Any comments will be appreciated. -- Thanks, Charlie (@mujiang) 木匠 === Data Architect Developer 汉唐 田园牧歌DBA http://mujiang.blogspot.com
Number of columns per row for Composite Primary Key CQL 3.0
Hello experts. Should I limit the number of rows per Composite Primary Key's leading column? I think it falls into the same wide row good practice for number of columns per row for CQL 2.0, e.g. 10M or less. Any comments will be appreciated. -- Thanks, Charlie (@mujiang) 木匠 === Data Architect Developer 汉唐 田园牧歌DBA http://mujiang.blogspot.com
