Issues and Troubleshooting
In this section, you will find information about Errors, Warnings, and Issues on the SnowConvert.
Last updated
In this section, you will find information about Errors, Warnings, and Issues on the SnowConvert.
Last updated
This is a deprecated version of the SnowConvert documentation, please visit the official site .
Before we get too far down the troubleshooting road, recall that we highly recommend that you go through in order to get the most out of SnowConvert.
Conversions of any large quantity of code will likely have a few errors and warnings. When using any of our tools, you can count on us to be your partner in resolving any errors you may encounter.
Below is a list of specific conversion issues for Oracle that you may see when you perform conversion with SnowConvert along with a severity level for each. Some suggested solution paths based on the severity level will follow the list of codes.
Take a minute to read through the list and the troubleshooting tips to help diagnose some of the error codes you have encountered. If you have a question that cannot be answered here, please reach out! You can drop us an email at . This is a living list, so it will grow and change as SnowConvert evolves. Updates to issue and error handling will appear on this page, and will also appear in the .
Here is the list of issue codes that exist in the SnowConvert for the Oracle platform. A detailed description of each issue code with its respective severity level can be seen in the following table.
The create sequence 'start with' statement value can not be LIMIT VALUE
Medium
Foreign key mismatch
Medium
OUTER JOIN syntax changed
Low
Syntax not supported
High
The format may be needed
Low
Timestamp output format
Low
Different output
Low
Unknown format
Low
JSON_TABLE not supported
High
XMLTABLE not supported
High
Format parameter not supported
Medium
Call specification not supported
Medium
NLS Parameter not supported
Medium
NLSSORT not supported
Medium
NLSSORT transformed
Low
Xml not supported
Medium
DBTIMEZONE removed
Low
Snowflake does not support occurrence parameter
Low
USING NCHAR_CS not supported
Low
Negative values not supported for function
Medium
SQL implicit cursor values may differ
Low
Siblings not supported
Low
RANK AGGREGATE function not supported
High
Table properties not required
Low
Synonyms not supported
Low
Rowid not supported
Medium
Rownum not supported
Medium
Multiset operator not supported
Medium
The default value on conversion error, not supported
Medium
Keep statement used to indicate that only the first or last values of the aggregate function will be returned is not supported
Medium
Not suitable function found to replace the input parameter for SYSCONTEXT
Medium
The specified parameter for the function is not supported
Medium
PLDeclaration in WITH statement not supported
Medium
Package Procedure/Function declaration heading not necessary
Low
The table collection expression is not supported
High
Arithmetic types not supported
Medium
Using index constraint state removed
Low
Search clause removed
Low
Cycle clause removed
Low
Statements and keywords removed from the column definition
Low
Enable or disable constraint state removed
Low
Model clause removed
Low
Create table statements removed
Low
Sequence option removed
Low
Missing dependencies objects
Low
Alter Table syntax is not applicable in Snowflake
Medium
TO_NCHAR transformed to TO_VARCHAR
Low
Function language not supported.
High
Package member not supported
Medium
Call to User Defined function not supported inside queries
High
PRAGMA EXCEPTION_INIT Not Supported
Low
Exception declaration is handled by the raise function
Low
User defined function was transformed to Snowflake procedure
Low
Package constant declaration
Low
Wrapped element not supported
Medium
Object versioning is not supported
Low
Nested Procedure or Function not supported
Medium
Date format session parameter
Low
Alter session configuration is not supported
Medium
Default value for SYSDATE is CURRENT_TIMESTAMP
Low
Column was transformed from DATE to TIMESTAMP
Low
NLS_NUMERIC_CHARACTERS session parameter not supported
Medium
Query using WITH TIES clause is missing ORDER BY
Low
Snowflake default calendar is Gregorian. It is not necessary to specify as a parameter
Low
NOCYCLE property is not supported
Medium
Add to stack of errors is not supported, boolean argument was removed
Low
Multiple Constraint Definition in a single statement is not supported in Snowflake
Medium
The create sequence 'start with' statement value exceeds the max value allowed by Snowflake.
Medium
CURRVAL property is not supported in Snowflake
Medium
Binary Operation Not Supported
Medium
Set Quantifier Not Supported
Low
Procedural Member not supported
Medium
Create Database Link Not Supported
Low
Create Index Not Supported
High
Labels in statements not supported
Medium
Built In Package Not Supported
Medium
Semantic information missing for ROWTYPE attribute
Low
Unable to parse dynamic SQL statement inside Execute Immediate
Medium
INSTR function converted to REGEXP_INSTR
Low
Create Type Not Supported
High
Snowflake Non-Ansi Outer Join has some functional differences compared to Oracle
Low
Cannot Convert Nested Type Attribute Expression
Medium
Unsupported format used for Trunc function
Low
Snowflake does not have a PURGE clause inside the DROP TABLE statement
Low
CASCADE CONSTRAINTS modified inside DROP TABLE statement to CASCADE
Low
Window frame output may not be equivalent
Low
Ordering of the Outer Joins failed
Low
Condition with unknown table name for outer join with (+)
Low
REGEXP_LIKE_UDF match parameter may not behave correctly
Low
Non-Ansi Outer Join has an invalid Between predicate
Low
LENGTHB transformed to OCTET_LENGTH results may vary due to memory management of DBMS
Low
Number datatype negative scale was removed from output
Low
Number datatype smaller precision was increased to match scale
Low
ROWID pseudocolumn is not supported in Snowflake
Medium
Operation Between Interval and Date Type not Supported
Medium
Interval Literal Not Supported In Current Scenario
High
Procedure Properties are Not Supported in Snowflake Procedures
Low
The Not Null constraint is not supported in variable declarations inside procedures in Snowflake
Low
Exception declaration code exceeds the Snowflake Scripting exception number limits
Low
For Loop with multiple conditions is currently not supported by Snowflake Scripting. Only first condition is used
Low
Specific For Lopp clause is currently not supported by Snowflake Scripting
Low
For Loop with float number as bound may not behave correctly in Snowflake Scripting
Low
For Loop format is currently not supported by Snowflake Scripting
High
Unusable collection variable
High
Additional work is needed for BFILE column usage. BUILD_STAGE_URL function is a recommended workaround
Low
Parametrized Cursor is not supported by Snowflake Scripting
High
Label declaration not supported
Low
The following assignment statement is not supported by Snowflake Scripting
Medium
Expressions as arguments of using clause are not supported by Snowflake Scripting
Medium
For update clause is not supported by Snowflake Scripting
Low
Transaction control statement requires additional intervention
Medium
DBMS_RANDOM.VALUE Built-In Package precision is lower in Snowflake
Low
The error logging clause in DML statements is not supported by Snowflake
Medium
Snowflake merge statement may have some functional differences compared to Oracle
Low
Check UDF implementation DBMS_OUTPUT.PUTLINE
Low
Operations between Intervals are not supported
Medium
Day format works differently between Oracle and Snowflake.
Low
Built-In views are not supported
Medium
Supplemental logging clause commented out
Low
Unnecessary built-in packages parameters
Low
Package Variable Assignment transformation
Low
Database Link connections not supported
Medium
Default Value Not Found For Parameter
Medium
Built-in package custom type changed to VARIANT
Low
Unusable object because its built-in custom type is not supported
Medium
Column alias removed
Low
Boolean cursor attribute is not supported
Medium
TYPE attribute could not be resolved
Low
For Loop and Fetch into variable cannot be used on the same cursor
Medium
COMMIT and ROLLBACK statements require the appropiate setup to work as intended
Low
COMMIT and ROLLBACK option were removed because Snowflake does not require them
Low
Cursor variable has already been assigned
Medium
Data Retention Period May Produce No Results
Low
In this section, you can find an explanation of the severities.
Warnings for source code that there was no direct conversion to Snowflake. The code has been converted to a functionally equivalent output but should still be reviewed.
Errors that produce a functional or runtime difference. The user may have to invest a low amount of manual effort to complete the conversion.
Errors that produce a functional or runtime difference. The user may have to invest a high amount of manual effort to complete the conversion.
Parsing errors or errors that cause significant conversion exceptions in SnowConvert. If the source code is correct, a significant intervention will be required.
As has been mentioned previously in this article, please reach out to us if you need more support. Snowflake wants to be your partner in the conversion process, so let us know how we can help. You can email us at . If you have a contract for support with Snowflake, reach out to your sales engineer and they can direct your support needs.