Re: Table Updates taking very long
Dear you can follow this link SQL Update, HANA performance Regards
View ArticleRe: Table Updates taking very long
But in that thread (SQL Update, HANA performance) they are talking about parametrized updates looping through each record. For every record the VB script is creating a connection to Hana and every SET...
View ArticleRe: Table Updates taking very long
It is normal that data in delta storage requires more memory than the same data in main storage because of less efficient compression. Nevertheless I would not expect this massive increase from only...
View ArticleRe: Table Updates taking very long
Hi Martin,the column store doesn't have column-wise updates. Whenever a record is updated, the old version gets invalidated and a complete new record is inserted into the delta store. - Lars
View ArticleRe: Table Updates taking very long
And I believe (please correct me if I am wrong) the data in delta store is not column store but row store and so uncompressed. Compression takes place only after you merge with the Main store. But come...
View ArticleRe: Table Updates taking very long
Hi Lars, thanks for your correction, I wasn't aware about this detail. In this case the memory consumption can be higher. Kind regards Martin
View ArticleRe: Table Updates taking very long
Nope - delta store is not a row store. Concerning the question: sure, it's fairly common to have to update data.However, back posting 20 Mio records is quite a huge batch to go for in a single...
View ArticleRe: Table Updates taking very long
Lars/Martin, As I read somewhere, Delta store has two parts. L1 and L2. L1 is Row Store and L2 is Column Store (but with no compression). And the UPDATE process is also a two step process. First...
View ArticleRe: Variable based on Current Date in HANA View
Sorry I didn't catched it on first read.Let's wait his answer with mode details.
View ArticleRe: Table Updates taking very long
I've got a pretty good idea where you might have read this.The actual implementation and with it the performance characteristics are not like you describe it. There is no row-wise decompression...
View ArticleCreate Function hana that call another function
Hi, I have this error "field or table alias is not allowed as an input of table functions" when try to create function on Hana Studio. The executed code is like this: CREATE FUNCTION "FUNCTION_2" (IN...
View ArticleRe: How to trigger alert 65 runtime of the log backups currently running?
Thank you Geo, Martin and Lars.and I end up learning something new ;-)The pleasure was mine too
View Articlehana on docker container
Hi, I have installed an hana server on a docker container and it's worked.But when I stop docker container, I am not able to restart hana server.it seems hdbdaemon doesn't start..Any idea ? Has someone...
View ArticleHANA Merge and Optimize Compression process
Hi, I'd love to know if anyone has any insight into MergeDog works. The best article I can find is 2 years old:...
View ArticleRe: HANA Merge and Optimize Compression process
Hi John, Great question to which I don't know the answer, but appreciate its importance. I'm sure Lars will jump in, but I think I heard somewhere that delta store doesn't have to be columnar, but...
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Re: HANA Merge and Optimize Compression process
I can answer your question if not my own The Delta store is columnar, I used to think it was row until Hasso corrected one of my blog. The column format is in general a good balance for read/wrote...
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Re: HANA Merge and Optimize Compression process
Hey John, short on time, so just a brief response to "what does optimize compression actually do?".(I believe I've covered that stuff in more detail in the book... ). Optimize compression tries to...
View ArticleRe: "Top N" Function in HANA
Could You please tel me how to write TOP function in Query and is Subquery.????.. because Im Getting Error "Subuery Does not Support TOP" ...
View ArticleProcedure failed
Hello, I'm calling a procedure (created in AFM) in sql console and it failed. Can someone guide me in what privileges do I need to provide. User: AFMUSERSchema: AFMUSER Error: "Could not execute...
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