Difference Between VARCHAR and VARCHAR2

VARCHAR and VARCHAR2 are variable-length character data types used in Oracle databases, but they are not intended for the same purpose. While VARCHAR is currently treated as a synonym for VARCHAR2, Oracle reserves it for possible future changes. VARCHAR2 is the officially supported and recommended data type for storing variable-length character strings because it offers stable, predictable behavior across Oracle versions.

This blog explains the difference between VARCHAR and VARCHAR2, covering their syntax, storage, key differences, use cases, and best practices to help you choose the right data type for Oracle database applications.

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Key Differences Between VARCHAR and VARCHAR2

Parameter	VARCHAR	VARCHAR2
Full Form	Variable Character	Variable Character 2
Usage in Oracle	Reserved for future use	Actively used and recommended
Current Support	Deprecated and discouraged	Fully supported
Default Mapping	Internally maps to VARCHAR2	Native Oracle datatype
Storage Allocation	Variable-length (same as VARCHAR2)	Variable-length (stores only actual data size)
Maximum Size	Same as VARCHAR2 (treated as such)	Up to 4,000 bytes in SQL, 32,767 in PL/SQL
NULL Handling	Treated the same as VARCHAR2 (currently)	NULL and empty string treated as the same
Future Compatibility	May change in future Oracle versions	Safe and consistent across versions
ANSI Compliance	Based on ANSI SQL standard	Oracle-specific extension
Documentation Status	Not recommended in Oracle documentation	Well-documented and supported
Preferred For Use?	No	Yes
Semantic Support	Byte semantics only	Byte and character semantics
Behavior Stability	Unstable (may change)	Stable

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What is VARCHAR?

The VARCHAR data type stands for Variable Character and is used to store character strings of variable length. It allows you to define a maximum number of characters, but only uses storage space for the actual length of the data inserted, making it more efficient than fixed-length types like CHAR.

VARCHAR(20)

This allows up to 20 characters, but if you store "Hello", it only uses space for 5 characters (plus a byte for length).

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What is VARCHAR2?

VARCHAR2 is Oracle’s official data type for storing variable-length character strings. Like VARCHAR, it allows you to define a maximum length, but it dynamically allocates storage based on the actual length of the input data.

VARCHAR2(50)

This stores strings up to 50 characters, but only consumes space for the characters you input, plus 1 or 2 bytes to store the length, depending on how many bytes the string contains.

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Why It's Preferred Over VARCHAR

Oracle explicitly recommends VARCHAR2 because:

• VARCHAR is reserved for future changes and may not always behave the same.
• VARCHAR2 is guaranteed to behave consistently across versions.
• It's optimized for performance and fully documented for production use.

In short: VARCHAR2 is safe, stable, and future-proof, making it the preferred choice for storing variable-length strings in Oracle.

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Common Use Cases for VARCHAR2

VARCHAR2 is one of the most frequently used datatypes in Oracle-based applications, thanks to its efficiency, flexibility, and support for variable-length text storage. Here are some real-world use cases:

1. Storing Usernames or Email Addresses

These vary in length but rarely exceed a certain limit.

username VARCHAR2(50),

email VARCHAR2(100)

2. Product Descriptions in E-commerce

Descriptions can be short or long, and VARCHAR2 saves space by storing only actual content.

product_description VARCHAR2(1000)

3. Customer Feedback or Comments

User-submitted content often varies in length and is a perfect fit for VARCHAR2.

customer_review VARCHAR2(2000)

4. Storing URLs or File Paths

These entries are variable by nature and benefit from dynamic length allocation.

image_url VARCHAR2(255)

5. Mobile Numbers or Contact Details

While consistent in format, they’re stored as strings to preserve formatting and prevent mathematical operations.

contact_number VARCHAR2(15)

6. Employee Designation or Role

Job titles differ greatly in length and frequency, making fixed-length storage inefficient.

designation VARCHAR2(100)

7. Audit Trail and Logging

For storing metadata or logs in admin/audit tables.

action_summary VARCHAR2(500),

ip_address VARCHAR2(45)

8. Flexible Metadata Fields

When a field's content is semi-structured or varies across entries.

custom_metadata VARCHAR2(2000)

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Conclusion: Which One Should You Use?

If you’re working with Oracle databases, the answer is clear, always use VARCHAR2, never VARCHAR.

While both may behave the same today, VARCHAR is a reserved keyword and could be redefined in future Oracle releases. Using it risks unexpected behavior, compatibility issues, and unnecessary maintenance headaches down the line.

VARCHAR2, on the other hand, is:

• Fully supported and documented by Oracle
• Stable across all versions
• Optimized for variable-length character data
• Capable of handling both byte and character semantics

From a performance, compatibility, and future-proofing perspective, VARCHAR2 is the only safe and recommended choice.

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