Zing generates search results in four phases
Generate search results by dividing documents among shards, searching shard documents, scoring shard documents, and merging scores into an index.
Zing generates search results in four phases:
- Divide searchable documents among index shards.
- Search and filter shard documents.
- Score shard documents.
- Merge shard document scores into an index.
Phase 1: Divide searchable documents among index shards
When a search is executed, the system equally divides all searchable documents among 10 index shards. Each shard has a unique list of documents.
To maximize search efficiency, the system creates 10 query threads to simultaneously search each index shard.
The system divides all searchable documents among 10 index shards from Shard 0 to Shard 9.
Phase 2: Search and filter shard documents
Each query thread searches through its list of shard documents to identify documents that match the search criteria. For example, if you search for "wifi network," the system returns all documents containing both "wifi" and "network" in no particular order.
Note: A multiple word search is equivalent to multiple single word searches connected by an AND operator. For example, [contains][wifi][AND][contains][network].
The query thread assigns each matching document a numeric value (a document ID) to uniquely identify it. All other documents are ignored.
Phase 3: Score shard documents
The query thread scores each matching shard document.
The system creates 10 Query threads to search, filter, and score shard documents.
Phase 4: Merge and sort shard document scores
The system merges the document scores into a single index and sorts the documents from highest to lowest document score. The documents with the highest document score are most relevant to the search query.
Merge and sort shard document scores.
Parent Topic:Zing text indexing and search engine
Related topics
Features of Zing text indexing and search engine
Global search finds records from multiple tables
Zing filters search results with access controls
Zing computes document scores using three components
Zing can include attachments in search results
Zing removes stop words from queries
Zing matches derived words with stemming
Zing can expand search results with synonyms
Zing displays search suggestions as users enter search terms