bytes

Return the number of bytes of storage used by value stored at each key

Syntax

b = bytes(c,keys)

Description

b = bytes(c,keys) returns the number of bytes of storage used by value stored at each key.

Examples

Get the Number of Bytes of Storage Used by a Value in the Cache

Start a persistence service that uses Redis™ as the persistence provider. The service requires a connection name and an open port. Once the service is running, you can connect to the service using the connection name and create a cache.

ctrl = mps.cache.control('myRedisConnection','Redis','Port',4519);
start(ctrl)
c = mps.cache.connect('myCache', 'Connection', 'myRedisConnection');

Add keys and values to the cache and then get the number of bytes of storage used by a value stored at each key in the cache. Represent the keys and the bytes used by each value of key as a MATLAB^® table.

put (c,'keyOne',10,'keyTwo',20,'keyThree',30,'keyFour',[400 500],'keyFive',magic(5))
b = bytes(c,{'keyOne','keyTwo','keyThree','keyFour','keyFive'})
tt = table(keys(c), bytes(c,keys(c))','VariableNames',{'Keys','Bytes'})

b =

    72    72    72    80   264


tt =

  5×2 table

       Keys       Bytes
    __________    ______

    'keyFive'      264  
    'keyFour'       80  
    'keyOne'        72  
    'keyThree'      72  
    'keyTwo'        72 

Input Arguments

c — Data cache

persistence provider specific data cache object

A data cache represented by a persistence provider specific data cache object.

Currently, Redis and MATLAB are the only supported persistence providers. Therefore, the cache objects will be of type mps.cache.RedisCache or mps.cache.MATFileCache.

Example: c

keys — Keys

cell array of character vectors

A list of all the keys, specified as a cell array of character vectors.

Example: {'keyOne','keyTwo','keyThree','keyFour','keyFive'}

Output Arguments

b — Number of bytes

numeric row vector

Number of bytes used by each value associated with a key, returned as a numeric row vector.

The byte counts in the output vector appear in the same order as the corresponding input keys. b(i) is the byte count for keys(i).

Version History

Introduced in R2018b