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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.

So which method is best In my experience, pessimistic locking works very well in Oracle (but perhaps not in other databases) and has many advantages over optimistic locking However, it requires a stateful connection to the database, like a client/server connection This is because locks are not held across connections This single fact makes pessimistic locking unrealistic in many cases today In the past, with client/server applications and a couple dozen or hundred users, it would have been my first and only choice Today, however, optimistic concurrency control is what I would recommend for most applications Having a connection for the entire duration of a transaction is just too high a price to pay Of the methods available, which do I use I tend to use the version column approach with a timestamp column It gives me the extra information when was this row last updated in a long-term sense.

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It is not my intention to cover all of the nuances of time zones here in this book; that is a topic well covered elsewhere To that end, I ll just point out that there is support for time zones in this datatype This support is more relevant in applications today than ever before A decade or so ago, applications were not nearly as global as they are now In the days before widespread Internet use, applications were many times distributed and decentralized, and the time zone was implicitly based on where the server was located Today, with large centralized systems being used by people worldwide, the need to track and use time zones is very relevant.

A Data Pump Import or Export job can access table data in either of two ways: Direct path: This access uses the Direct Path API. Direct-path exports and imports lead to improved performance, since the direct-path internal stream format is the same format as the data stored in Oracle dump files. This leads to a reduced need for data conversions. The big advantage of the direct-path mode is that it bypasses the database buffer cache and doesn t generate any undo data. External tables: The external tables feature lets Oracle read data from and write data to operating system files that lie outside the database. 13 explains external tables in detail. It is up to Oracle to decide which access method it will employ for a given job. Oracle always tries to use the direct-path method to load or unload data, but under some conditions, it may not be able to employ that method. In the following cases, the structure of the table and/or the indexes precludes the use of direct-path access, so Data Pump will use external tables:

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