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Data Pump is a server-side utility You initiate Data Pump jobs from a user process, either SQL*Plus or through Enterprise Manager, but all the work is done by server processes This improves performance dramatically over the old Export/Import utilities, because the Data Pump processes running on the server have direct access to the datafiles and the SGA; they do not have to go via a session Also, it is possible to launch a Data Pump job and then detach from it, leaving it running in the background You can reconnect to the job to monitor its progress at any time There are a number of processes involved in a Data Pump job, two queues, a number of files, and one table First, the processes: The user processes are expdp and impdp (for Unix) or expdpexe and impdpexe (Windows) These are used to launch, control, and monitor Data Pump jobs Alternatively, there is an Enterprise Manager interface, more on which later The expdp or impdp user process establishes a session against the database through a normal server process This session then issues commands to control and monitor Data Pump jobs When a Data Pump job is launched, at least two processes are started: a Data Pump Master process (the DMnn) and one or more worker processes (named DWnn) If multiple Data Pump jobs are running concurrently, each will have its own DMnn process, and its own DWnn processes As the name implies, the master process controls the workers If you have enabled parallelism, then each DWnn may make use of two or more parallel execution servers (named Pnnn) Two queues are created for each Data Pump job: a control queue and a status queue The DMnn divides up the work to be done and places individual tasks that make up the job on the control queue The worker processes pick up these tasks and execute them perhaps making use of parallel execution servers This queue operates on a deliver-exactly-once model: messages are enqueued by the DMnn and dequeued by the worker that picks them up The status queue is for monitoring
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Explain the General Architecture of Oracle Data Pump
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purposes: the DMnn places messages on it describing the state of the job This queue operates on a publish-and-subscribe model: any session (with appropriate privileges) can query the queue to monitor the job s progress The files generated by Data Pump come in three forms: SQL files, dump files, and log files SQL files are DDL statements describing the objects included in the job You can choose to generate them (without any data) as an easy way of getting this information out of the database, perhaps for documentation purposes or as a set of scripts to recreate the database Dump files contain the exported data This is formatted with XML tags The use of XML means that there is a considerable overhead in dump files for describing the data A small table like the REGIONS table in the HR sample schema will generate a 94 KB dump file, but while this overhead may seem disproportionately large for a tiny table like that, it becomes trivial for larger tables The log files describe the history of the job run Lastly, there is the control table This is created for you by the DMnn when you launch a Remember the three Data job, and is used both to record the job s progress Pump le types: SQL les, log les, and and to describe it It is included in the dump file dump les as the final item of the job
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Data Pump always uses Oracle directories These are needed to locate the files that it will read or write, and its log files One directory is all that is needed, but often a job will use several If the amount of data is many gigabytes to be written out in parallel to many files, you may want to spread the disk activity across directories in different file systems If a directory is not specified in the Data Pump command, there are defaults Every 11g database will have an Oracle directory that can be used This is named DATA_PUMP_DIR If the environment variable ORACLE_BASE has been set at database creation time, the operating system directory will be the directory admin/database_name/dpdump beneath this If ORACLE_BASE is not set, the directory will be admin/database_name/dpdump beneath the ORACLE_ HOME directory (where database_name is the name of the database) To identify the location in your database, query the view DBA_DIRECTORIES However, the fact that this Oracle directory exists does not mean it can be used; any user wishing to use Data Pump will have to be granted read and/or write permissions on it first
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