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Oracle Maximum datatypes Lengths

Oracle Database Tips by Donald BurlesonFebruary 16, 2015

Question:  What are the maximum values for Oracle column datatypes? 

Answer:  The table below gives the maximum values for the most common Oracle datatypes.  Note that the BFILE datatype stored objects outside of Oracle at the filesystem level, and that the maximum size of a directory name is 30 characters and the maximum size of a file name is 255 characters:

BFILE

Maximum size is 4 GB

BLOB

Maximum size is ((4 GB - 1) * db_block_size)

CHAR

Maximum size is 2,048 bytes

CHAR VARYING

Maximum size is 4,096 bytes

CLOB

Maximum size is ((4 GB - 1) * db_block_size)

LONG

Maximum size is (2 GB - 1)

NCHAR

Maximum size is 2,048 bytes

NCHAR VARYING

Maximum size is 4,096 bytes

NCLOB

Maximum size is ((4 GB - 1) * db_block_size)

NUMBER

999…(38 9's) x10125 maximum value

RAW

Maximum size is 2,048 bytes

VARCHAR

Maximum size is 4,096 bytes

VARCHAR2

Maximum size is 4,096 bytes

 


 

 

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