A schema in Oracle consists of tables, index, Log segments, Lob Index, table partition and index partition. The schema size in Oracle depends on the size of all these objects. Let’s check how to find the size of the schema in Oracle
How to find the segment_type for a particular schema
select segment_type,count(*) from dba_segments where owner=upper('&schema_name') group by segment_type;
This will show the type of segments existing in the schema and the count of each of them
Query to find the sum of the size of the table for a particular schema
select sum(bytes)/1024/1024/1024 as "SIZE in GB of Tables" from dba_segments where owner='&schema_name' and segment_type='TABLE';
The Sum of the size of the index in it
select sum(bytes)/1024/1024/1024 as "SIZE in GB of Index" from dba_segments where owner='&schema_name' and segment_type='INDEX';
The sum of the size of the Lobindex in it
select sum(bytes)/1024/1024/1024 as "SIZE in GB of lobIndex" from dba_segments where owner='&schema_name' and segment_type='LOBINDEX';
Total size of the Lobsegments in a schema
select sum(bytes)/1024/1024/1024 as "SIZE in GB of lobsegments" from dba_segments where owner='&schema_name' and segment_type='LOBSEGMENT';
The sum of the size of the Table Partition for a specific schema
select sum(bytes)/1024/1024/1024 as "SIZE in GB of table Partition" from dba_segments where owner='&schema_name' and segment_type='TABLE PARTITION';
The sum of the size of the Index Partition for a specific schema
select sum(bytes)/1024/1024/1024 as "SIZE in GB of table Partition" from dba_segments where owner='&schema_name' and segment_type='INDEX PARTITION';
How to find the size of schema in Oracle
select sum(bytes)/1024/1024/1024 as "SIZE in GB of schema" from dba_segments where owner=upper('&schema_name');
The above will include the size of all the segment types in the Schema
I hope this helps in day-to-day administration. Please do provide feedback to improve
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