Normally refers to a variable length string data type.

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What does it mean? ORA-06502: PL/SQL: numeric or value error: character string buffer too small

Q 1: Whenever an Oracle SP wants to return error code/message, it fails returning below exeption: OLE DB provider "OraOLEDB.Oracle" for linked server "ORASRV" returned message "ORA-06502: PL/SQL: ...
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MySQL 'copying to tmp table' while enlarging VARCHAR

One user called today because he has tried to enlarge a VARCHAR column (from 20 to 100) in a slightly large table resulting in a write-locked table. I watched PROCESSLIST and saw that ALTER TABLE ...
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Implicitly (or proxy) convert to Nvarchar on incoming queries from legacy or 3rd party applications

We have a 3rd party application of which we don't have the source code. This application executes queries on our database without using the "N" prefix before literal strings. It does this in inserts ...
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Performance implications of mixing VARCHAR and CHAR fields in MySQL Table

I read the following answers in this forum: What is the performance impact of using CHAR vs VARCHAR on a fixed-size field? MySQL: Does the order of the fields in a table make a difference in ...