using hbase as key-value store, need to extract a value using java
java,hbase,key-value-coding,key-value-store
You don't need to do a scan if you know the exact value of the key, you can do a Get instead, which should be super efficient. Result result = table.get(Bytes.toBytes("hashvalue")) The reason why it's taking too long when you trigger next is because every call to next is an...
Can Riak be used with a third party key value store as the backend
Yes, you certainly could, LevelDB is also built as a .so file. However, LeveDB's API differs from how Riak expects a backend to behave, so it requires and interface module riak_kv_eleveldb_backend so that it responds to Riak the way it expects. You would likely need to do the same for...
Is a key-value store appropriate for a usage that requires “get all”?
mongodb,redis,nosql,key-value-store,document-store
In Redis you can get all the keys and values, with a bit of work and the following commands: SCAN: to get all the keys TYPE: determine the type of the key (string, hash, list etc) MGET/HGETALL/etc: to get the actual values, depending on which structure the key refers to....
Swap two random values in dictionary
python,dictionary,key-value-store
The power of python: key1, key2 = random.sample(list(d), 2) d[key1], d[key2] = d[key2], d[key1] ...
Is Couchbase an ordered key-value store?
database,couchbase,key-value-store,couchbase-lite
Query efficiency is correlated with the construction of the views that are added to the server. Couchbase/Couchbase Lite only stores the indexes specified and generated by the programmer in these views. As Couchbase rebalances it moves documents between nodes, so it seems impractical that key order could be guaranteed or...
Swift - Working with Dictionaries - Add multiple values
osx,cocoa,swift,dictionary,key-value-store
Dictionaries map from a specific key type to a specific value type. For example, you could make your key type String and your value type Int. In your case, you’ve declared quite a strange dictionary: a mapping from Strings (fair enough), to an array of 4-tuples of 4 different dictionary...
List of values : Code constants or database?
My favorite solution would be: Stores log types in database: CREATE TABLE logTypes ( id (SMALLINT, PK) code VARCHAR(32) UNIQUE ) Create constants in code class logTypes { const CREATE_USER = 1; const EDIT_USER = 2; ... } and choose a sync policy: Create the logTypes class from DB =>...
Boltdb-key-Value Data Store purely in Go
go,backend,datastore,key-value-store,boltdb
A Bolt database is usually embedded into a larger program and is not used over the network like you would with shared databases (think SQLite vs MySQL). Using Bolt is a bit like having a persistent map[[]byte][]byte if that were possible. Depending on what you are doing, you might want...
Sort treemap on value and return it as treemap agin.
You're creating a TreeSet, whereas, you need to create a TreeMap. The comparator which you pass to TreeMap, will use the map passed as parameter, to fetch the value and compare them. Change your method to: static <K, V extends Comparable<? super V>> TreeMap<K, V> entriesSortedByValues(final Map<K, V> map) {...
GWAN Key-Value persistent store
c,key-value,g-wan,key-value-store
As G-WAN scripts are compiled and linked independently, 'global' variables are 'static' (to each script) rather than available for all scripts. So, you have to attach the KV store to a persistent pointer. G-WAN offers persistent pointers with different scopes: US_REQUEST_DATA = 200, // Request-wide pointer US_HANDLER_DATA, // Listener-wide pointer...
GWAN Key-Value persistent multiple store
c,key-value,g-wan,key-value-store
I just attach a kv store that contain all the kv stores I need to the persistence pointer. G-WAN kv is fast, plus the number of records is small, it should not hurt performance. xbuf_t *reply = get_reply(argv); kv_t **kv_db = (kv_t **)get_env(argv, US_VHOST_DATA); if (!kv_db[0]) { kv_db[0] = (kv_t*)...
Get an value from dynamically generated array
You just loop through the entire array and then ask for the 7th value(index 6): foreach($arr as $v) printf("<pre>%s</pre>", $v[6]); You can also have a look at array_keys....
In what situation do you use Simple Hash Keys on DynamoDB?
database,amazon-web-services,amazon-dynamodb,key-value-store
You use single hash key table to describe an item. For examle, a user have many info like name, age, etc. You can create a user table with user_id as hashkey and all other info as attributes. You use hash-range schema to describe a relationship. For example, one team can...