Client sends the data to a random node It might seem that way, but there is actually a non-random way that your driver picks a node to talk to. This node is called a “coordinator node” and is typically chosen based-on having the least (closest) “network distance.” Client requests can really be sent to any … Read more
cqlsh -e “select * from ks.table limit 1;” > ~/output
Wrong syntax. Here you are: insert into user_by_category (game_category,customer_id) VALUES (‘Goku’,’12’); or: insert into user_by_category (“game_category”,”customer_id”) VALUES (‘Kakarot’,’12’); The second one is normally used for case-sensitive column names.
I had a similar problem with my cassandra v2.0.4 cluster running a single node. Check your cassandra.yaml and make sure that your “listen_address” and “seeds” values match, with the exception that the seeds value requires quotes around it.
select * from update_audit where scopeid=35 and formid=78005 and record_link_id=9897; How the above query will work internally in cassandra? Essentially, all data for partition scopeid=35 and formid=78005 will be returned, and then filtered by the record_link_id index. It will look for the record_link_id entry for 9897, and attempt to match-up entries that match the rows … Read more
Yes, you can use COUNT(*). Here’s the documentation. A SELECT expression using COUNT(*) returns the number of rows that matched the query. Alternatively, you can use COUNT(1) to get the same result. Count the number of rows in the users table: SELECT COUNT(*) FROM users;
Use the SOURCE http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/source_r.html You can use -f option as well to execute commands from file http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/cqlsh.html