Perfect, Aaron, Thanks a lot
From: aaron morton [mailto:aa...@thelastpickle.com] Sent: Tuesday, February 14, 2012 12:54 AM To: user@cassandra.apache.org Subject: Re: Secondary indexes and cardinality Heard that indexing a field with high cardinality is not good. http://www.datastax.com/docs/0.7/data_model/secondary_indexes Will there be any performance improvement? Is this the way secondary indexes are maintained? Updating secondary indexes requires a read and a write. Also this makes me think - Will there be any lose if we have many rows in a CF say 10 million? http://www.datastax.com/docs/0.7/data_model/cfs_as_indexes#indexes Having 10 million columns in a row is not a problem by itself. It depends on how you want to read things. Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 14/02/2012, at 1:11 AM, Tiwari, Dushyant wrote: Hi Cassandra Users, Heard that indexing a field with high cardinality is not good. If we create a CF to store the index information like indexed field as key and the keys of original CF as cols in the row. Will there be any performance improvement? Is this the way secondary indexes are maintained? Also this makes me think - Will there be any lose if we have many rows in a CF say 10 million? Thanks, Dushyant ________________________________ NOTICE: Morgan Stanley is not acting as a municipal advisor and the opinions or views contained herein are not intended to be, and do not constitute, advice within the meaning of Section 975 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. If you have received this communication in error, please destroy all electronic and paper copies and notify the sender immediately. Mistransmission is not intended to waive confidentiality or privilege. Morgan Stanley reserves the right, to the extent permitted under applicable law, to monitor electronic communications. This message is subject to terms available at the following link: http://www.morganstanley.com/disclaimers. If you cannot access these links, please notify us by reply message and we will send the contents to you. By messaging with Morgan Stanley you consent to the foregoing. -------------------------------------------------------------------------- NOTICE: Morgan Stanley is not acting as a municipal advisor and the opinions or views contained herein are not intended to be, and do not constitute, advice within the meaning of Section 975 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. If you have received this communication in error, please destroy all electronic and paper copies and notify the sender immediately. Mistransmission is not intended to waive confidentiality or privilege. Morgan Stanley reserves the right, to the extent permitted under applicable law, to monitor electronic communications. This message is subject to terms available at the following link: http://www.morganstanley.com/disclaimers. If you cannot access these links, please notify us by reply message and we will send the contents to you. By messaging with Morgan Stanley you consent to the foregoing.
