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CHAPTER 15 DATA LOADING AND UNLOADING
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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 and if you determine this to be an issue.
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In this section, we explored external tables. They are a new feature of Oracle9i and later that may, for the most part, replace SQLLDR. We investigated the quickest way to get going with external tables: the technique of using SQLLDR to convert the control files we have from past experiences. We demonstrated some techniques for detecting and handling errors via the bad files and, lastly, we explored some multiuser issues regarding external tables. We are now ready to get into the last sections in this chapter, which deal with unloading data from the database.
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One thing SQLLDR does not do, and that Oracle supplies no command-line tools for, is unload data in a format understandable by SQLLDR or other programs. This would be useful for moving data from system to system without using EXP/IMP or EXPDP/IMPDP (the new Data Pump replacements for EXP and IMP). Using EXP(DP)/IMP(DP) to move data from system to system works fine as long as both systems are Oracle.
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Note HTML DB provides a data export feature as part of its SQL Workshop. You may export the information in a CSV format easily. This works well for a few megabytes of information, but it is not appropriate for many tens of megabytes or more.
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We will develop a small PL/SQL utility that may be used to unload data on a server in a SQLLDR-friendly format. Also, equivalent tools for doing so in Pro*C and SQL*Plus are provided on the Ask Tom web site at http://asktom.oracle.com/~tkyte/flat/index.html. The PL/SQL utility will work fine in most small cases, but better performance will be had using Pro*C. Pro*C and SQL*Plus are also useful if you need the files to be generated on the client and not on the server, which is where PL/SQL will create them. The specification of the package we will create is as follows: ops$tkyte@ORA10G> create or replace package unloader 2 AUTHID CURRENT_USER 3 as 4 /* Function run -- unloads data from any query into a file 5 and creates a control file to reload that 6 data into another table 7 8 p_query = SQL query to "unload". May be virtually any query. 9 p_tname = Table to load into. Will be put into control file.
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10 p_mode = REPLACE|APPEND|TRUNCATE -- how to reload the data 11 p_dir = directory we will write the ctl and dat file to. 12 p_filename = name of file to write to. I will add .ctl and .dat 13 to this name 14 p_separator = field delimiter. I default this to a comma. 15 p_enclosure = what each field will be wrapped in 16 p_terminator = end of line character. We use this so we can unload 17 and reload data with newlines in it. I default to 18 "|\n" (a pipe and a newline together) and "|\r\n" on NT. 19 You need only to override this if you believe your 20 data will have that sequence in it. I ALWAYS add the 21 OS "end of line" marker to this sequence, you should not 22 */ 23 function run( p_query in varchar2, 24 p_tname in varchar2, 25 p_mode in varchar2 default 'REPLACE', 26 p_dir in varchar2, 27 p_filename in varchar2, 28 p_separator in varchar2 default ',', 29 p_enclosure in varchar2 default '"', 30 p_terminator in varchar2 default '|' ) 31 return number; 32 end; 33 / Package created. Note the use of AUTHID CURRENT_USER. This permits this package to be installed once in a database and used by anyone to unload data. All the person needs is SELECT privileges on the table(s) he wants to unload and EXECUTE privileges on this package. If we did not use AUTHID CURRENT_USER in this case, then the owner of this package would need direct SELECT privileges on all tables to be unloaded.
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Note The SQL will execute with the privileges of the invoker of this routine. However, all PL/SQL calls will
run with the privileges of the definer of the called routine; therefore, the ability to use UTL_FILE to write to a directory is implicitly given to anyone with execute permission on this package.
The package body follows. We use UTL_FILE to write a control file and a data file. DBMS_SQL is used to dynamically process any query. We use one datatype in our queries: a VARCHAR2(4000). This implies we cannot use this method to unload LOBs, and that is true if the LOB is greater than 4,000 bytes. We can, however, use this to unload up to 4,000 bytes of any LOB using DBMS_LOB.SUBSTR. Additionally, since we are using a VARCHAR2 as the only output data type, we can handle RAWs up to 2,000 bytes in length (4,000 hexadecimal characters), which is sufficient for everything except LONG RAWs and LOBs. Additionally, any query that references a nonscalar
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