What factors should be considered when deciding whether to create an index on a column in DB2?
- Complexity of queries, table partitioning, and disk space availability.
- Length of the column, table size, and data type of the column.
- Number of rows in the table, number of columns in the table, and memory usage.
- Selectivity of the column, frequency of data retrieval, and performance requirements.
Several factors should be considered when deciding whether to create an index on a column in DB2. These include the selectivity of the column, which determines how unique the values are, the frequency of data retrieval using the column, and the overall performance requirements of the system. Indexes should be created on columns that are frequently used in WHERE clauses and join conditions, but not on columns that have low selectivity or are rarely used in queries.
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