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POCalculate string size in UTF-8 when converted from Latin-9 (ISO/IEC 8859-15)
 

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  1. POCalculate string size in UTF-8 when converted from Latin-9 (ISO/IEC 8859-15)
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    <p>We have a jdbc program which moves data from one database to another. </p> <ol> <li>Source database is using Latin9 character set</li> <li>Destination database uses UTF-8 encoding and the size of a column is specified in bytes instead of characters</li> <li>We have converted ddl scripts of source database to equivalent script in destination database keeping the size of the column as-is.</li> <li>In some cases, if there are some special characters, the size of the data after converting to UTF-8 is exceeding the size of the column in destination database causing the jdbc program to fail.</li> </ol> <p>I understand that UTF-8 is variable-width encoding scheme which can take 1-4 bytes per character, given this the worst case solution would be to allocate 4 times the size of a column in destination database.</p> <p>Is there a better estimate? </p>
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    1. USsandeepkunkunuru
    1. USsandeepkunkunuru
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    1. COI thought the size of varchar columns was given in chars not bytes. Therefore the size should be the same even if the byte size is different.
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      1. POCalculate string size in UTF-8 when converted from Latin-9 (ISO/IEC 8859-15)
      1. USAlastair McCormack
    2. COThat was the expectation but in this specific case the destination database used bytes for varchar column size
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      1. USsandeepkunkunuru
    3. CO@AlastairMcCormack for example Oracle allows you to define the size in bytes or characters; it could also be an indication that the column has no character set and stores pure bytes (so it is actually a degenerate varbinary).
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      1. POCalculate string size in UTF-8 when converted from Latin-9 (ISO/IEC 8859-15)
      1. USMark Rotteveel
 

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