Buying hash Vars

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Buying hash Vars

I have a join of 2 datasets that takes 1h36 to process, and I thought to reduce the processing time to use hash tables. Of these tables, one has 1,, rows and 11 variables, the other has 1,, rows and 42 variables. I'm wondering, in a hash step, which of the 2 tables should be loaded into the hash table and which one to put into the set. Thank you. The boring but correct answer, is that there is no telling for sure. It depends on a lot of factors. Simply try it. There is a technique to read many variables into the hash object in the article below. Should save you some typing. How large are the tables? How much memory can a sas session use? Are you using sql or a data step now? Are the tables indexed? To use the hash object the whole table must fit into memory. The volumes of your two tables look like this could be an issue. You would normally load the lower volume table into the hash or if there is a one to many relationship then eventually the table that's 'one' so you don't need to loop over the hash. Are you sure you don't have some many to many join condition? How many rows does your target table have? What also would help is a Proc Contents of your two source tables so we can see the size and if there are any indexes or sorts. And what also would help is to understand the relationships between the tables. Paul illustrates a technique that allows to join two table without put straining your SAS's allocated memory. If you know your data well enough, you might find a way to save a lot of memory usage by using multiple hashes for one of your datasets. And maybe you know that there is a limited number of combinations of variables X7-X10 let's assume 5, Then you could dynamically set a code for each of those combinations while the hash object is in memory, and recover those codes after the join. Assuming you are joining B and A on a single variable, ID , then it might look something like this:. So instead of having a hash object with ALL of A's data 1. The latter takes almost no memory at all compared to the savings achieved in the former. And you could use this technique for additional subsets of variables in A if their combination also has a low cardinality. You'd just have a code hash for each variable collection. It's now there. Are you ready for the spotlight? The call is open until September Read more here about why you should contribute and what is in it for you! Submit your idea! View all other training opportunities. Sign In. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. All forum topics Previous Next. Hash with many variables. Posted AM views. Re: Hash with many variables. Posted AM views In reply to mariopellegrini. I doubt that you would gain much by jopining two tables in the about the same size. Data never sleeps. Thank you To use the hash object the whole table must fit into memory. Posted PM views In reply to mariopellegrini. That can be costly. How to Concatenate Values. Click image to register for webinar Classroom Training Available! Select SAS Training centers are offering in-person courses. Discussion stats.

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Buying hash Vars

I am running into a problem with big data inner joining. I created a hash object but not sure how to use all variables without typing all variable names into the definedata and call missing. Should I be using the call missing? Here's another version of setting the PDV host variable equivalent. I call it PD's style :. Love it when he toils with SAS coding. View solution in original post. So if i could grasp what I have read and comprehended so far on reading the almighty's incarnation PD's book, I think I am right. Are you ready for the spotlight? The call is open until September Read more here about why you should contribute and what is in it for you! Submit your idea! Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video. View all other training opportunities. Sign In. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. All forum topics Previous Next. Need further help from the community? Please sign in and ask a new question. Go to Solution. Hash Tables Joining with Large number of Variables. Posted PM views. Accepted Solutions. Posted PM views In reply to novinosrin. When loading a dataset into a hash table, you don't need call missing for the reason if 0 then set bigdata. Took missing out and works great! What is Bayesian Analysis? Click image to register for webinar Classroom Training Available! Select SAS Training centers are offering in-person courses. Discussion stats.

Buying hash Vars