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It is the programmer s responsibility to prevent memory allocations in CERs. Several operations are explicitly forbidden in CERs. These operations include the following: Usage of gcnew, because it results in newobj and newarr IL instructions. Boxing. Acquiring a CLR-specific object-based thread lock via Monitor.Enter or msclr::lock. Entering such a lock can result in a new lock structure being allocated. CAS checks. Calling .NET objects via special proxy objects called transparent proxies. In the current release of the CLR and the C++/CLI language, these constraints are nothing more than guidelines. Neither the runtime nor the compilers check whether a method is actually implemented according to the CER restrictions or not.

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For example, the REMAP_SCHEMA parameter enables you to map all of user HR s schema to a new user, OE The REMAP_SCHEMA parameter is similar to the TOUSER parameter in the old import utility..

The SQL*Loader tool discussed in the previous chapter is designed to move data into or out of one or a few tables at the most. For exporting or importing entire schemas and even databases, the Data Pump Export and Import utilities are ideal. Here are some of the main uses of the Data Pump tools: Migrating databases from development to test or production Copying test data from development/testing databases to production or vice versa Transferring data between Oracle databases on different operating system platforms Backing up important tables before you make any changes to them Backing up databases Moving database objects from one tablespace to another Transporting tablespaces between databases Reorganizing fragmented table data Extracting the DDL for tables and other objects such as stored procedures and packages

The entry first sets the set -x expansion flag, assigns a variable, performs a test, and then, based on the results, sends an e-mail message. crontab entries can be powerful tools in your scripting arsenal.

Data Pump doesn t create a perfect backup, because you won t have up-to-the-minute data in the export file when a disaster occurs. However, for smaller databases and individual tablespace exports, data exports are still viable as a backup tool.

As you ll see, the Data Pump Export and Import utilities are extremely versatile and easy to use. You can export just the DDL for objects if you wish, or you can export and import the objects with the data. You also have the choice of exporting and importing a single table (or even a part of a single table), all the tables in a tablespace, an entire schema, or an entire database.

On the surface, expdp and impdp are quite similar to the traditional export and import utilities. However, while they are syntactically similar to the Data Pump clients, exp and imp are ordinary user processes that use SQL statements like SELECT, INSERT, and CREATE. In contrast, the new Data Pump utilities are more like control processes that initiate jobs. In Data Pump Export and Import, the database instance handles the Data Pump utilities. The Data Pump technology consists of three major components: DBMS_DATAPUMP package: This is the main engine for driving data dictionary metadata loading and unloading. The DBMS_DATAPUMP package (Data Pump API) contains the guts of the Data Pump technology in the form of procedures that actually drive the data loading and unloading jobs. The contents of this package perform the work of both the Data Pump Export and Import utilities. DBMS_METADATA package: To extract and modify metadata, Oracle provides the DBMS_METADATA package (Metadata API), which has been available since Oracle9i. In the traditional export and import utilities, the metadata of the objects is included in the export dump file. In Data Pump technology, you need to use the DBMS_METADATA package to extract the appropriate metadata. Command-line clients: The two command-line utilities expdp and impdp correspond to the old exp and imp utilities. The expdp utility invokes the Data Pump Export utility, and the impdp utility invokes the Data Pump Import utility. The dump files you create with these new utilities aren t compatible with the older export/import utilities. Note that both packages DBMS_DATAPUMP and DBMS_METADATA act as APIs (the Data Pump API and the Metadata API), in the sense that you can use either of them directly in your programs to load and unload data without accessing the expdp and impdp clients.