Analyzing a schema or Gathering schema stats

In Oracle, you can use the DBMS_STATS package to gather statistics for a schema or specific database objects. Here's an example of how you might gather statistics for a schema:

-- Connect as a user with appropriate privileges (e.g., DBA)

-- Gather statistics for the entire schema

EXEC DBMS_STATS.GATHER_SCHEMA_STATS('your_schema_name');

-- If you want to gather statistics for specific tables within the schema:

-- For example, gathering statistics for a single table:

EXEC DBMS_STATS.GATHER_TABLE_STATS('your_schema_name', 'your_table_name');

-- If you want to gather statistics for specific indexes within the schema:

-- For example, gathering statistics for a single index:

EXEC DBMS_STATS.GATHER_INDEX_STATS('your_schema_name', 'your_index_name');

In this example:

• Replace 'your_schema_name' with the name of the schema for which you want to gather statistics.
• Replace 'your_table_name' with the name of the specific table for which you want to gather statistics.
• Replace 'your_index_name' with the name of the specific index for which you want to gather statistics.

It's important to note that you'll need appropriate privileges to gather statistics, typically either ANALYZE privilege or the DBA role.

These commands will collect statistics on data distribution, column cardinality, and other relevant information, which Oracle's query optimizer uses to generate efficient execution plans for queries.