Month: April 2014

DBMS_UTILITY.FORMAT_ERROR_BACKTRACE in PLSQL

In Big/complex applications, it is essential to call Sub-programs (Procedures/Functions) from other sub-programs. In that case it will be difficult to trace out Errors/Exceptions from where it is raised i.e. which sub-program caused the exception. Normally we can use SQLCODE and SQLERRM to get the error/exception, but these may not work in the above case. …

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Histograms in Oracle for Table Columns

Histogram:A histogram is a special type of column statistic that provides more detailed information about the data distribution in a table column. Purpose of Histograms:By default the optimizer assumes a uniform distribution of rows across the distinct values in a column. For columns that contain data skew (a nonuniform distribution of data within the column), …

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