efficient way to store 8-bit or 16-bit value?
What do people recommend I do to store a small binary value in a column? I’d rather not simply use a 32-bit int for a single byte value. Can I have a one byte blob? Or should I store it as a single character ASCII string? I imagine each is going to have the overhead of storing the length (or null termination in the case of a string). That overhead may be worse than simply using a 32-bit int. Also is it possible to partition on a single character or substring of characters from a string (or a portion of a blob)? Something like: CREATE TABLE test ( id text, value blob, PRIMARY KEY (string[0:1]) )
Re: efficient way to store 8-bit or 16-bit value?
Column metadata is about 20 bytes. So, there is no big difference if you save 1 or 4 bytes. Thank you, Andrey On Wed, Dec 11, 2013 at 2:42 PM, onlinespending onlinespend...@gmail.comwrote: What do people recommend I do to store a small binary value in a column? I’d rather not simply use a 32-bit int for a single byte value. Can I have a one byte blob? Or should I store it as a single character ASCII string? I imagine each is going to have the overhead of storing the length (or null termination in the case of a string). That overhead may be worse than simply using a 32-bit int. Also is it possible to partition on a single character or substring of characters from a string (or a portion of a blob)? Something like: CREATE TABLE test ( id text, value blob, PRIMARY KEY (string[0:1]) )
Re: efficient way to store 8-bit or 16-bit value?
What do people recommend I do to store a small binary value in a column? I’d rather not simply use a 32-bit int for a single byte value. blob is a byte array or you could use the varint, a variable length integer, but you probably want the blob. cheers - Aaron Morton New Zealand @aaronmorton Co-Founder Principal Consultant Apache Cassandra Consulting http://www.thelastpickle.com On 12/12/2013, at 1:33 pm, Andrey Ilinykh ailin...@gmail.com wrote: Column metadata is about 20 bytes. So, there is no big difference if you save 1 or 4 bytes. Thank you, Andrey On Wed, Dec 11, 2013 at 2:42 PM, onlinespending onlinespend...@gmail.com wrote: What do people recommend I do to store a small binary value in a column? I’d rather not simply use a 32-bit int for a single byte value. Can I have a one byte blob? Or should I store it as a single character ASCII string? I imagine each is going to have the overhead of storing the length (or null termination in the case of a string). That overhead may be worse than simply using a 32-bit int. Also is it possible to partition on a single character or substring of characters from a string (or a portion of a blob)? Something like: CREATE TABLE test ( id text, value blob, PRIMARY KEY (string[0:1]) )
