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Overlaying records is a way to update data in a Concordance database from a delimited file. As noted earlier in this chapter, no linking criteria is used to match records from the source file to database records in Concordance. Instead, rows of data are updated in the order in which they appear, both in the delimited file and in the database. For this procedure to work, you must know what sort-order criteria was used to sort records in the delimited file, and you must apply that same sort-order criteria to records in the database. If you don t do this, the overlay will update data in the wrong order, and data in Concordance will be lost. Because there s no way to roll back a data load and restore the database to an earlier state, you re advised to make a full backup of the database prior to performing the procedure. Overlaying with the Overlay Wizard The first dialog of the Import/Overlay Wizard gives you the option either to import or overlay data. The first screen of this dialog is displayed in Figure 6-16. To overlay data, select the Overlay radio button. Clicking this radio button opens the First and Last text fields. The numbers in these text fields are, by default, the first and last record, referenced by ordinal position, which

Change the table structure (with ALTER TABLE) Delete rows Execute stored functions or procedures Go back in time (with FLASHBACK TABLE) Create indexes on the table Insert new rows Create foreign key constraints to the table Query the table (or view) Change column values of existing rows

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are accessible to Concordance from the last active search. Changing these values gives you the ability to update a subset of records. Changing the value in the First text field from 1 to 5, and changing the Last text field value to 15, means that only the fifth through fifteenth records in the database will be updated from the delimited file. If there are any records in the delimited file past the ten required to update the fifth through fifteenth database records, they re ignored.

The Oracle DBMS allows you to group privileges into roles. Roles make user management much easier, more flexible, and also more manageable. The following are the corresponding SQL commands used to administer these privileges and roles: GRANT, to grant certain privileges or roles to users or roles REVOKE, to revoke certain privileges or roles from users or roles

A typical scenario is the following: CREATE ROLE <role name> GRANT privileges TO <role name> GRANT <role name> TO user(s) The first step creates a new (empty) role. The second step (which can be repeated as many times as you like) populates the role with a mix of object and system privileges. The third step grants the role (and thereby all its privileges) to a user in a single step. Roles have several useful and powerful properties: Roles are dynamic; further changes to the role contents automatically affect all users previously granted that role. Roles can be enabled or disabled during a session. You can protect roles with a password. In that case, only users who know the role password can enable the role. The most important advantage of roles is their manageability.

Figure 6-16. You select the option to overlay records from this dialog. You can use the First and Last fields to specify the range of records to be updated.

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Each table has an owner, the user who created the table. Table owners are able to grant privileges on their tables to other database users using the GRANT command. As soon as you create a table, you implicitly get all object privileges on that table, WITH GRANT OPTION, as illustrated in Figure 2-3, which shows the syntax of the GRANT command.