Adding an existing value?

Hi guys,.

I am new to Berkeley DB. I was wondering if there is a way to add to an existing value in the comic book. In my application, the value is in the form of link-list (which is converted to DataEntry). On each update, I would like to add to it and then write it to the disk. I am currently using Berkeley DB in synchronous mode. So, whenever I do an update, the integer value is read into memory and then update is made and this great updated value is written to the disk. It takes a lot of time. Is there a way by which just change can be added to the list? There is the flag Db.DB_APPEND in com.sleepycat.db. * (Berkeley DB standard), but is there something similar in Berkeley DB Java Edition?

BDB - I is based on what we call architecture "structured file newspaper." This does not allow updates on data; each update of a record creates a new version of record, which is added at the end of a log file (a "cleaner" internal module is responsible for disposing of older versions to recover disk space). There are advantages and disadvantages of this architecture, but it is what it is.

For your case, the best approach may be to store list items in separate records in a DB "duplicates". Records in a DB duplicates have, conceptually, 2 keys, a primary and a secondary key, and they are sorted first by their primary key, and then by their secondary key. In addition, the entire records are stored in the nodes of a BTree. Thus, consecutive records are stored physically next to each other as long as they fit into the same BTree node. This provides a degree of the locality. In your case, the primary key is the id of the list, and assuming that the lists are only added, the secondary key could be the position of the record in the list. Note that secondary keys are not explicitly exposed to the API. You implicitly declare them by providing a "comparator" class to compare parts of the value of the (primary) key/value pairs.

For other databases, many of the more traditional RDBMS provide support "-" LOB (large object), which, I believe, can do what you want (of course, internally, the LOB can also be broken up into several segments). I don't know if the most recent NoSQL databases offer such capabilities.

Best,

Markos.

Tags: Database

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