Dsr admin error updating secondary indexes
As an example of how secondary indexes might be used, consider a database containing a list of students at a college, each of whom has a unique student ID number.A typical database would use the student ID number as the key; however, one might also reasonably want to be able to look up students by last name.Any number of secondary indexes may be associated with a given primary database, up to limitations on available memory and the number of open file descriptors.Note that although Berkeley DB guarantees that updates made using any DB handle with an associated secondary will be reflected in the that secondary, associating each primary handle with all the appropriate secondaries is the responsibility of the application and is not enforced by Berkeley DB.Secondary indexes can be created manually by the application; there is no disadvantage, other than complexity, to doing so.
Riak Search serves analogous purposes but is quite different because it parses key/value data itself and builds indexes on the basis of Solr schemas. Field names are automatically lowercased, some fields have multiple values, and duplicate fields are automatically de-duplicated, as in the following example: Namespace people Bucket = new Namespace("indexes", "people"); Riak Object larry = new Riak Object() Value(Binary Value.create("My name is Larry")); Indexes()Index(String Bin Index.named("field1")).add("val1"); Indexes()Index(Long Int Index.named("field2")).add(1001L); Store Value store Larry = new Store Value. Put operations of any kind are forbidden on secondary indexes, as there is no way to specify a primary key for a newly put item.Instead, the application should use the DB-put() methods on the primary database.Cursor get operations on a secondary index perform as expected; although the data returned will by default be those of the primary database, a position in the secondary index is maintained normally, and records will appear in the order determined by the secondary key and the comparison function or other structure of the secondary database.Delete operations on a secondary index delete the item from the primary database and all relevant secondaries, including the current one.