The FT._LIST
command provides a list of all indexes in your database:
FT.INFO
provides information about a specific index:
As you are build your application and add more information to the database you may need to add new fields to the index. The FT.ALTER
command enables you to do this.
The WEIGHT
declares the importance of this field when
calculating result accuracy. This is a multiplication factor (default is 1);
so in this example the plot is less important than the title.
Let's do a query with the new indexed field:
You can drop an index using the FT.DROPINDEX
command.
Dropping an index does not impact the indexed hashes, this means that the movies are still inside the database.
> FT._LIST
1) "idx:movie"
> FT.INFO "idx:movie"
1) "index_name"
2) "idx:movie"
...
5) "index_definition"
...
7) "fields"
...
9) "num_docs"
10) "4"
...
> FT.ALTER idx:movie SCHEMA ADD plot TEXT WEIGHT 0.5
"OK"
> FT.SEARCH idx:movie "empire @genre:{Action}" RETURN 2 title plot
> FT.DROPINDEX idx:movie
"OK"
>SCAN 0 MATCH movie:*
1) "0"
2) 1) "movie:11002"
2) "movie:11004"
3) "movie:11003"
4) "movie:11005"
You can delete the indexed document/hashes by adding the DD
parameter.