Oracle to MariaDB Migration

SQLines provides tools and services to help you transfer data, convert database schema (DDL), views, stored procedures, functions, packages, triggers, queries and SQL scripts from Oracle to MariaDB.

• SQLines Data - Data transfer, schema migration and validation tool
• SQLines SQL Converter - SQL scripts assessment and conversion tool

Databases:

• Oracle 19c, 18c, 12c, 11g, 10g and 9i
• MariaDB 10.x and 5.x

Starting from MariaDB 10.3 there is the Oracle compatibility mode, see Oracle to MariaDB Migration - Compatibility Mode.

• Data Types
• Sequences

Character data types:

Unicode character data types:

	Oracle		MariaDB
1	NCHAR(n)	Fixed-length Unicode string, n <= 2000	NCHAR(n)	n <= 255
			NVARCHAR(n)	n > 255
2	NVARCHAR2(n)	Variable-length Unicode string, n <= 4000	NVARCHAR(n)	n <= 65,535
3	NCLOB	Unicode large character object	LONGTEXT

Numeric data types:

Date and time data types:

	Oracle		MariaDB
1	DATE	Date and time with seconds	DATETIME

Binary data types:

Other data types:

1	ROWID	Physical row address	CHAR(10)
2	XMLTYPE	XML data	LONGTEXT

Datetime functions:

	Oracle		MariaDB
1	TO_DATE(string, format)	Convert string to datetime	STR_TO_DATE(string, format)
	TO_DATE(string)		CAST(string AS DATETIME)

Note that sequences are available since MariaDB 10.3

CREATE SEQUENCE and ALTER SEQUENCE statements:

	Oracle		MariaDB
1	CREATE SEQUENCE seqname		CREATE [OR REPLACE] SEQUENCE seqname
2	ALTER SEQUENCE seqname		ALTER SEQUENCE [IF EXISTS] seqname
3	INCREMENT BY num	Positive or negative increment, default is 1	INCREMENT BY num
4	START WITH num	Initial value	START WITH num
5	MAXVALUE num	Maximum value is num	MAXVALUE num
	NOMAXVALUE	System limit	NOMAXVALUE
6	MINVALUE num	Minimum value is num	MINVALUE num
	NOMINVALUE	System limit	NOMINVALUE
7	CYCLE	Reuse values after reaching the limit	CYCLE
	NOCYCLE	No reuse, this is default	NOCYCLE
8	CACHE num	Cache num values, default is 20	CACHE num	Default is 1000
	NOCACHE	Values are not preallocated	NOCACHE
9	ORDER	Guarantee numbers in order of requests	Option not supported, commented
	NOORDER	No guarantee, this is default	Option not supported, removed as it is default

Referencing sequence values:

Note that in Oracle mode (sql_mode = oracle), you can use the Oracle syntax seqname.CURRVAL and seqname.NEXTVAL to get sequence values in MariaDB.

DROP SEQUENCE statement: