Oracle Function Index » 10010.cd
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One of the most important Oracle Silver Bullets is the function-based index. A function-based index allows you to match any WHERE clause in an SQL statement and remove unnecessary large-table full-table scans with super-fast index range scans. - See here how to display function based indexes. A function-based index can be either a B-tree or a bitmap index. The function used for building the index can be an arithmetic expression or an expression that contains a SQL function, user-defined PL/SQL function, package function, or C callout. For example, a function could add the values in. The ‘trick’ is of course nothing but a function-based index. By adding nulls to your function-based index, you ensure that Oracle is able to avoid full table scans when you ask for col_name IS NULL. Alternatively, you can use NVL as a function in your index if you want to; you have to remember that your index can only be used if you use.

In Oracle, you can create a function-based index that stores precomputed results of a function or expression applied to the table columns. Function-based indexes are used to increase the performance of queries that use functions in the WHERE clause. You cannot direct path load the table with a function based index if that function was user written and requires the SQL ENGIRE. That means you cannot direct path load into a table indexed using my_soundexx, but you could if it had indexed upperx. Function based indexes in Oracle can help to build the index according to some function, because functions are always conflicting with indexes and indexes cannot work fine with all kinds of functions. In SQL server doesn’t have function based indexes but instead you can make an index. In sum, function-based indexes FBIs are a Godsend for the Oracle DBA who has to remove unnecessary full-table scans or fix sub-optimal index choices. Using an FBI can positively effect all SQL statements that have the matching predicate and speed-up an entire database. Oracle: return a »table« from a function. With collections and the table function, a function can return a table that can be queried in an SQL statement. Poor man's text index in Oracle is an example that uses this technique to search in the middle of words in a table.

Answer: The Oracle script collection has dictionary queries to display the values of a function-based index, but I'm not allowed to display the whole dictionary script. The dba_indexes view has a new column that makes this easier, the funcidx_status column. I need to find the last index of a string e.g. "-" within another string e.g. "JD-EQ-0001" in Oracle version 8i. Is there a way to do this with INSTR or another function?

This Oracle tutorial explains how to use the Oracle / PLSQL INSTR function with syntax and examples. The Oracle / PLSQL INSTR function returns the location of a substring in a string.

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