code 128 crystal reports 8.5 DATA LOADING AND UNLOADING in Objective-C

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CHAPTER 15 DATA LOADING AND UNLOADING
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DNAME -------------Sales Accounting Consulting Finance XYZ ops$tkyte@ORA11GR2> select deptno 2 from SYS_SQLLDR_X_EXT_DEPT 3 / DEPTNO ---------10 20 30 40
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we get different numbers of rows from each query. The DNAME field was valid for every single record in the input file, but the DEPTNO column was not. If we do not retrieve the DEPTNO column, it does not fail the record the resultset is materially changed.
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Using an External Table to Load Different Files
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A common need is to use an external table to load data from differently named files over a period of time. That is, this week we must load file1.dat, and next week it will be file2.dat, and so on. So far, we ve been loading from a fixed file name, demo1.ctl. What if we subsequently need to load from a second file, demo2.dat Fortunately, that is pretty easy to accommodate. The ALTER TABLE command may be used to repoint the location setting of the external table: ops$tkyte@ORA11GR2> alter table SYS_SQLLDR_X_EXT_DEPT 2 location( 'demo2.dat' ); Table altered. And that would pretty much be it the very next query of that external table would have it accessing the file demo2.dat.
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Multiuser Issues
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In the introduction to this section, I described three situations where external tables might not be as useful as SQLLDR. One of them was a specific multiuser issue. We just saw how to change the location of an external table how to make it read from file 2 instead of file 1 and so on. The problem arises when multiple users each try to concurrently use that external table and have it point to different files for each session. This cannot be done. The external table will point to a single file (or set of files) at any given time. If I log in and alter the table to point to file 1 and you do the same at about the same time, and then we both query that table, we ll both be processing the same file. This issue is generally not one that you should encounter external tables are not a replacement for database tables; they are a means to load data, and as such you would not use them on a daily basis as
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CHAPTER 15 DATA LOADING AND UNLOADING
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part of your application. They are generally a DBA or developer tool used to load information, either as a one-time event or on a recurring basis, as in a data warehouse load. If the DBA has ten files to load into the database using the same external table, she would not do them sequentially that is, pointing the external table to file 1 and processing it, then file 2 and processing it, and so on. Rather, she would simply point the external table to both files and let the database process both of them: ops$tkyte@ORA11GR2> alter table SYS_SQLLDR_X_EXT_DEPT 2 location( 'file1.dat', 'file2.dat') 3 / Table altered. If parallel processing is required, then the database already has the built-in ability to do this, as demonstrated in the last chapter. So the only multiuser issue would be if two sessions both tried to alter the location at about the same time and this is just a possibility to be aware of, not something I believe you ll actually run into very often. Another multiuser consideration is that of the bad and log file names. What if you have many sessions concurrently looking at the same external table or using parallel processing (which, in some respects, is a multiuser situation) It would be nice to be able to segregate these files by session, and fortunately you can do that. You may incorporate the following special strings: %p: PID. %a: Parallel execution servers agent ID. The parallel execution servers have numbers 001, 002, 003, and so on assigned to them.
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In this fashion, each session will tend to generate its own bad and log files. For example, if you used the following BADFILE syntax in the CREATE TABLE statement from earlier RECORDS DELIMITED BY NEWLINE CHARACTERSET WE8ISO8859P1 BADFILE 'SYS_SQLLDR_XT_TMPDIR_00000':'demo1_%p.bad' LOGFILE 'demo1.log_xt' you would expect to find a file named similarly to the following if any records failed loading: $ ls *.bad demo1_7108.bad However, you still might have issues over lengthy periods of time. The PIDs will be reused on most operating systems. So the techniques outlined in dealing with errors may well still be relevant you ll need to reset your bad file or rename it if it exists if you determine this to be an issue.
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