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n this chapter, we will discuss data loading and unloading in other words, how to get data into and out of an Oracle database. The main focus of the chapter is on the following bulk data loading tools: SQL*Loader (pronounced sequel loader ): This is still a predominant method for loading data. External tables: This is a new feature with Oracle9i and above that permits access to operating system files as if they were database tables and, in Oracle 10g and above, even allows for the creation of operating system files as extracts of tables. In the area of data unloading, we ll look at two techniques: Flat file unload: The flat file unloads will be custom developed implementations, but will provide you with a result that is portable to other types of systems (even a spreadsheet). Data Pump unload: Data Pump is a binary format proprietary to Oracle and is accessible via the Data Pump tool and external tables.
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SQL*Loader (SQLLDR) is Oracle s high-speed, bulk data loader. It is an extremely useful tool used to get data into an Oracle database from a variety of flat file formats. SQLLDR can be used to load enormous amounts of data in an amazingly short period of time. It has two modes of operation: Conventional path: SQLLDR will employ SQL inserts on our behalf to load data. Direct path: SQLLDR does not use SQL in this mode; it formats database blocks directly. The direct path load allows you to read data from a flat file and write it directly to formatted database blocks, bypassing the entire SQL engine, undo generation and, optionally, redo generation at the same time. Parallel direct path load is among the fastest ways to go from having no data to a fully loaded database. We will not cover every single aspect of SQLLDR. For all of the details, refer to the Oracle Utilities manual, which dedicates seven chapters to SQLLDR in Oracle 10g. The fact that it is
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CHAPTER 15 DATA LOADING AND UNLOADING
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covered in seven chapters is notable, since every other utility, such as DBVERIFY, DBNEWID, and LogMiner get one chapter or less. For complete syntax and all of the options, I will refer you to the Oracle Utilities manual, as this chapter is intended to answer the How do I . . . questions that a reference manual does not address. It should be noted that the Oracle Call Interface (OCI) allows you to write your own direct path loader using C, with Oracle 8.1.6 Release 1 and onward. This is useful when the operation you want to perform is not feasible in SQLLDR, or when seamless integration with your application is desired. SQLLDR is a command-line tool (i.e., it s a separate program). It is not an API or anything that can be called from PL/SQL, for example. If you execute SQLLDR from the command line with no inputs, it gives you the following help: [tkyte@desktop tkyte]$ sqlldr SQL*Loader: Release 10.1.0.4.0 - Production on Sat Jul 16 10:32:28 2005 Copyright (c) 1982, 2004, Oracle. All rights reserved. Usage: SQLLDR keyword=value [,keyword=value,...] Valid Keywords: userid -- ORACLE username/password control -- control file name log -- log file name bad -- bad file name data -- data file name discard -- discard file name discardmax -- number of discards to allow (Default all) skip -- number of logical records to skip (Default 0) load -- number of logical records to load (Default all) errors -- number of errors to allow (Default 50) rows -- number of rows in conventional path bind array or between direct path data saves (Default: Conventional path 64, Direct path all) bindsize -- size of conventional path bind array in bytes (Default 256000) silent -- suppress messages during run (header,feedback,errors,discards,partitions) direct -- use direct path (Default FALSE) parfile -- parameter file: name of file that contains parameter specifications parallel -- do parallel load (Default FALSE) file -- file to allocate extents from skip_unusable_indexes -- disallow/allow unusable indexes or index partitions (Default FALSE) skip_index_maintenance -- do not maintain indexes, mark affected indexes as unusable (Default FALSE) commit_discontinued -- commit loaded rows when load is discontinued (Default FALSE) readsize -- size of read buffer (Default 1048576) external_table -- use external table for load; NOT_USED, GENERATE_ONLY, EXECUTE
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