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Placement of Additional Hints in Oracle Forms

additional hints|additional hints

Placement of Additional Hints in Oracle Forms

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In order to make additional hints stand out, you need to position them at the top of your form, not in the field itself. This will help them be recognizable when someone quickly scans the form. However, if they are too visible, they can add clutter to your form. Luckily, there are several ways to place these hints on your form.

Access path hints

Access path hints allow you to specify a particular access path for a specific SQL statement. When used correctly, these hints can improve query performance. You can set them in the Modify Optimization Hints panel. Access path hints can affect query performance in two ways. You can choose to use old access paths, or you can specify new access paths.

Join order hints

Oracle allows you to specify the join order for tables in the FROM clause of a query. Generally, you should use the LEADING hint over the ORDERED hint. This means that the tables in the FROM clause are joined first, then the other tables are joined in a specified order from the hint.

Index names

In many cases, a query will generate an error stating that the index ‘index_name’ on table ‘dbo.table_name’ does not exist. This problem is caused by the fact that many queries generate plan cache entries that use a specific index. However, these plan cache entries are more noise than useful information. The only cases in which these plan cache entries are useful are when you have an implicit index name hint in user application code or an ad hoc query window.

Column list hints

You can specify a column list hint in a query in many ways. In many cases, a column list will be used to specify the index of a data column. This is useful for small lookup tables. But in some cases, it can also be used to specify the name of a column.

Using a DRIVING_SITE hint

If you’re running a distributed query, you can improve query performance by using the DRIVING_SITE hint. This hint forces the optimizer to do join operations at a remote site instead of the local one. The result set will then be returned to the local site. This is useful if you have a massive table that’s spread across multiple sites.

Using a NO_PUSH_SUBQ hint

Using a NO_PUSH_SUBQ hint as an additional hint can make a difference in your query’s execution plan. However, you need to use caution when using this hint. Many people misuse this hint and are not aware of the ramifications of its use. Incorrect usage can cause instability in your system and should be avoided at all costs.