|
Item
|
Type of Limit
|
Limit Value
|
|
Indexes
|
Maximum per table
|
Unlimited
|
|
Indexes
|
Total size of indexed column
|
75% of the database block size minus some
overhead
|
|
Columns
|
Per table
|
1000 columns maximum
|
|
Columns
|
Per index (or clustered index)
|
32 columns maximum
|
|
Columns
|
Per bitmapped index
|
30 columns maximum
|
|
Constraints
|
Maximum per column
|
Unlimited
|
|
Subqueries
|
Maximum levels of sub queries in a SQL
statement
|
Unlimited in the FROM clause
of the top-level query
255 sub queries in the WHERE clause
|
|
Partitions
|
Maximum length of linear partitioning key
|
4 KB - overhead
|
|
Partitions
|
Maximum number of columns in partition key
|
16 columns
|
|
Partitions
|
Maximum number of partitions allowed per table
or index
|
1024K - 1
|
|
Rows
|
Maximum number per table
|
Unlimited
|
|
System Change Numbers (SCNs)
|
Maximum
|
281,474,976,710,656, which is 281 trillion SCNs
|
|
Stored Packages
|
Maximum size
|
Approximately 6,000,000 lines of code.
|
|
Trigger Cascade Limit
|
Maximum value
|
Operating system-dependent, typically 32
|
|
Users and Roles
|
Maximum
|
2,147,483,638
|
|
Tables
|
Maximum per clustered table
|
32 tables
|
|
Tables
|
Maximum per database
|
Unlimited
|
|
|