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CHAPTER 12 DATATYPES
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2 D a a a
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from t; DUMP -------------------Typ=1 Len=1: 224 Typ=1 Len=1: 225 Typ=1 Len=1: 226
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Notice how in the 7-bit session I received the letter a three times with no diacritical marks. However, the DUMP function is showing me that in the database there are, in fact, three separate distinct characters, not just the letter a. The data in the database hasn t changed just the values this client received. If this client were to retrieve that data into host variables as follows ops$tkyte@ORA11GR2> variable d varchar2(1) ops$tkyte@ORA11GR2> variable r varchar2(20) ops$tkyte@ORA11GR2> begin 2 select data, rowid into :d, :r from t where rownum = 1; 3 end; 4 / PL/SQL procedure successfully completed. and do nothing whatsoever with it, just send it back to the database. ops$tkyte@ORA11GR2> update t set data = :d where rowid = chartorowid(:r); 1 row updated. ops$tkyte@ORA11GR2> commit; Commit complete. I would observe in the original 8-bit session that I have lost one of the original characters. It has been replaced with the lowly 7-bit a, not the fancy I had previously ops$tkyte@ORA11GR2> select data, dump(data) dump 2 from t; D a DUMP -------------------Typ=1 Len=1: 97 Typ=1 Len=1: 225 Typ=1 Len=1: 226
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This demonstrates the immediate impact of an environment with a heterogeneous character set, whereby the clients and database use different NLS settings. It is something to be aware of because it comes into play in many circumstances. For example, if the DBA uses the deprecated legacy EXP tool to extract information, he may observe the following warning: [tkyte@desktop tkyte] $ exp userid=/ tables=t Export: Release 11.2.0.1.0 - Production on Mon Apr 12 10:33:30 2010 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Export done in US7ASCII character set and AL16UTF16 NCHAR character set server uses WE8MSWIN1252 character set (possible charset conversion)
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CHAPTER 12 DATATYPES
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Such warnings should be treated very seriously. If you were exporting this table with the goal of dropping the table and then using IMP to re-create it, you would find that all of your data in that table was now lowly 7-bit data! Beware the unintentional character set conversion.
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Note The problem of unintentional character set conversion does not affect every tool, nor does it affect every
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tool in the same ways. For example, if you were to use the recommended data pump export/import process, you would discover that the export is always done in the character set of the database containing the data, regardless of the client s NLS settings. This is because data pump runs in the database server itself; it is not a client side tool at all. Similarly, data pump import will always convert the data in the file to be imported from the source database s character set into the destination database s character set meaning that character set conversion is still possible with data pump (if the source and target databases have different character sets) but not in the same fashion as with the legacy EXP/IMP tools!
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But also be aware that, in general, character set conversions are necessary. If clients are expecting data in a specific character set, it would be disastrous to send them the information in a different character set.
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Note I highly encourage everyone to read through the Oracle Globalization Support Guide document. It covers
NLS-related issues to a depth we will not here. Anyone creating applications that will be used around the globe (or even across international boundaries) needs to master the information contained in that document.
Now that we have a cursory understanding of character sets and the impact they will have on us, let s take a look at the character string types provided by Oracle.
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