Techopedia Explains Clustered Index In other words, a clustered index stores the actual data, where a non-clustered index is a pointer to the data. In most DBMSs, you can only have one clustered index per table, though there are systems that support multiple clusters (DB2 being an example)...
“Unable to enlist in the transaction” with Oracle linked server from MS SQL Server [<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source ...
Don't forget that SQL Server imposes the limit that a given table can only have one clustered index, but this limitation does not exist in all DBMSs. So when you answer the question, make sure you and the interviewer are thinking about the same DBMS. ...
For example... nova wrote: That's why I have never been a fan of the IDENTITY feature in SQL Server. It's a different matter for other DBMSs because the no-update limitation of auto-incrementing columns is peculiar to SQL Server. I do NOT agree with forsaking the proprietary extensions...
Subramanian, Muralidhar, et al., Performance Challenges in Object-Relational DBMSs, Data Engineering Journal 22, Feb. 1999 pp. 28-32. Welch, Brent B., et al., Pseudo Devices: User-Level Extensions to the Sprite File System, Computer Science Division, Department of Electrical Engineering and...
“Unable to enlist in the transaction” with Oracle linked server from MS SQL Server [<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source nam...
Using composite keys results in multi column joins, increased index size, and in worse performance. It does however allow you to filter grandchild tables based on the a value from the parent without joining to the child and parent (if the filter column is part of the PK) ...