Logical Database Limits in Oracle

1)CREATE MATERIALIZED VIEW definition size Limit
Maximum size: 64K Bytes

2)GROUP BY clause size Limit
Maximum length: Must fit within a single database block.

3)Indexes Limit
Maximum per table: Unlimited
Total size of indexed column: 75% of the database block size minus some overhead

4)Columns Limit
Maximum Per table: 1000
Maximum Per index (or clustered index): 32
Maximum Per bitmapped index: 30

5)Constraints
Maximum per column: Unlimited

6)Subqueries
Maximum levels of subqueries in a SQL statement in the FORM clause of top-level query: Unlimited
Maximum levels of subqueries in a SQL statement in the WHERE clause: 255

7)Partitions
Maximum length of linear partitioning key: 4 KB - overhead
Maximum number of columns in partition key: 16 columns
Maximum number of partitions allowed per table or index: 1024K - 1

8)Rows
Maximum number per table: Unlimited

9)Stored Packages
Maximum size: Limits typically range from 2000 to 3000 lines of code.

10)Trigger Cascade Limit
Maximum value: Operating system-dependent, typically 32

11)Users and Roles
Maximum: 2,147,483,638

12)Tables
Maximum per clustered table: 32 tables
Maximum per database: Unlimited

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