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SQL 文を実行する
To execute a SQL statement
SQL 文を実行するには、次の手順に従います。
To execute a SQL statement in an ODBC application
ODBC アプリケーションで SQL 文を実行するには、次の手順に従います。
To execute a SQL statement against a Windows CE database
Windows CE データベースに対して SQL 文を実行するには、次の手順に従います。
To execute a SQL statement, Oracle Database might need to perform many steps. Each of these steps either retrieves rows of data physically from the database or prepares them in some way for the user issuing the combination of the steps Oracle Database uses to execute a statement is called an execution plan. An execution plan includes an access path for each table that the statement accesses and an ordering of the tables (the join order) with the appropriate join method.
Sometimes, to execute a SQL statement issued by a user, the Oracle Server must issue additional statements are called recursive calls or recursive SQL example, if you insert a row into a table that does not have enough space to hold that row, the Oracle Server makes recursive calls to allocate the space dynamically if dictionary managed tablespaces are being used. Recursive calls are also generated
Using the rule-based approach, the optimizer chooses an execution plan based on the access paths available and the ranks of these access can use rule-based optimization to access both relational data and object types. Oracle's ranking of the access paths is heuristic. If there is more than one way to execute a SQL statement, the rule-based approach always uses the operation with the lower rank. Usually, operations of lower rank execute faster than those associated with constructs of higher rank.
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