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23 Μαΐ 2017 · It's to do with set-based processing. A query takes one or more sets of rows (e.g. tables) and returns another set of rows. It therefore makes sense to take the resulting set of rows and perform another query on that new set .
Bulk Binds (BULK COLLECT & FORALL) and Record Processing in Oracle. This article is an update of one written for Oracle 8i which includes new features available in Oracle 9i Release 2 and beyond. Introduction; BULK COLLECT; FORALL; SQL%BULK_ROWCOUNT; SAVE EXCEPTIONS and SQL%BULK_EXCEPTION; Bulk Binds and Triggers; Updates; Related articles.
V$SQL lists statistics on shared SQL areas without the GROUP BY clause and contains one row for each child of the original SQL text entered.
V$SQL_BIND_CAPTURE displays information on bind variables used by SQL cursors. Each row in the view contains information for one bind variable defined in a cursor. This includes: Reference to the cursor defining the bind variable. (hash_value, address) for the parent cursor and (hash_value, child_address) for the child cursor. Bind metadata.
2 Ιουν 2023 · Bind variables, often called bind parameters or query parameters, are often used in WHERE clauses to filter data. Instead of putting the required value into the query, or writing separate queries for each different value, or concatenating strings, you can use bind variables. Here’s how it works.
V$SQL_BIND_DATA describes, for each distinct bind variable in each cursor owned by the session querying this view: Actual bind data, if the bind variable is user defined. The underlying literal, if the CURSOR_SHARING parameter is set to FORCE and the bind variable is system generated.
Concatenating variable values into a SQL statement makes the statement unique, forcing a hard parse. By contrast, using bind variables allow reuse of statements as the text of the statement remains the same. Only the value of the bind variable changes.
