5/15/2023 0 Comments Oracle data generatorGLOBAL_STATS Are the statistics calculated without merging underlying partitions? SAMPLE_SIZE The sample size used in analyzing this columnĬHAR_COL_DECL_LENGTH Declaration length of character type column LAST_ANALYZED The date of the most recent time this column was analyzed NUM_BUCKETS The number of buckets in histogram for the column NUM_NULLS The number of nulls in the column NUM_DISTINCT The number of distinct values in the column ExampleĬOLLATED_COLUMN_ID Reference to the actual collated column’s internal sequence numberĭATA_TYPE_MOD Datatype modifier of the columnĭATA_TYPE_OWNER Owner of the datatype of the columnĭATA_LENGTH Length of the column in bytesĭATA_PRECISION Length: decimal digits (NUMBER) or binary digits (FLOAT)ĭATA_SCALE Digits to right of decimal point in a numberĬOLUMN_ID Sequence number of the column as createdĭEFAULT_LENGTH Length of default value for the columnĭATA_DEFAULT Default value for the column View DICT_COLUMNS describes the columns of a data dictionary view and their purpose. WHERE table_name = 'ALL_TAB_COLS' OutputĪLL_TAB_COLS | Columns of user's tables, views and clusters DICT_COLUMNS View DICTIONARY outputs available data dictionary views and their purpose. There are quite a number of data dictionary views available in Oracle and remembering them is quite difficult, so Oracle had created data dictionary views to document the details of data dictionary views. In conclusion, Just as the static data dictionary views provide information about the database, the V$ views provide information about the active instance. These V$ views are based on a set of internal memory structures maintained by Oracle as virtual tables (begin with an “X$” prefix). There is a second set of views known as dynamic views or dynamic performance views, and commonly referred to as V$ views. These views, known as static data dictionary views, present information contained in tables that are updated when Oracle processes a Data Definition Language (DDL) statement. The data dictionary is packaged with a series of views owned by the SYS user. By querying these tables and views, we can obtain information about every object and every user of the database. The Oracle data dictionary is a collection of tables and related views that enable us to view the structure of the Oracle database. You wanted to generate a data model from data dictionary tables in Oracle
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