![]() He has worked for clients within banking, financial services, Life Insurance, Health Care, public sector, and telecommunications industries. In the past, he has developed and architected BPM/SOA technologies for more than ten of those years, from Fuego BPM to BEA AquaLogic BPM to Oracle BPM/SOA 11g and 12c. So far, every one of his students have completed their MuleSoft certification and are key contributors to AVIO projects. He is a certified MuleSoft developer and leads students through intensive MuleSoft Bootcamps, the goal being to instill AVIO best practices and real-world development experiences in the students. Currently, he is mandated with the skills development of AVIO employees worldwide. Greg has decades of experience in all phases of design, development, and implementation of software applications. Other tools should be considered to manage new or complex schema migrations. The SQL Developer Database Diff feature can quickly identify schema differences and is oriented to Oracle databases. ![]() This is where Liquibase and Flyway earn their reputations so consider these tools for larger or newer projects. Schema rollbacks may be necessary so maintains the original schema with properly dated or version-identified DDL files is one mechanism.Consider appending the DDL file name with a date or version, as schema changes will evolve over time so this may be necessary. The DDL should be versioned in source control.There will be a few issues when running the DDL, for example the CREATE TABLE will contain a primary key constraint and then further down will be the DDL to create the index for it which will fail.If you elect to run the DDL do so on a local environment first before undertaking this in the real environment (DEV or PROD).The SQL generated will contain the necessary ALTER and create/replace statements for the differences shown.In the upper left corner of the Diff Report is a SQL icon, select this to generate the SQL for the differences shown.Optionally you can select the Show Equal Objects to see what has is unchanged in the two schemas. The Diff Report will display in a graphical view the differences it found.The comparison will take a minute or two, be patient. In the Summary review your previous selection and select Finish to create the Diff Report.You may use "wildcards" in your Lookup request which may be prudent for large schemas. In the third step of the Diff Wizard perform a Lookup and then shuttle the objects to be selected list.It's less churn to create the Diff Report as well. If you're tracking down a specific change un-check all but the object types you have not interest in seeing. In the second step of the Diff Wizard select the schema types to be compared.For schema differences alone, ignore storage and tablespace differences. The DDL generation defaults are comprehensive. In the first step of the Diff Wizard select the Source and Destination connections.Create database connections to the DEV and TEST databases to be compared (highlighted in blue above).This feature was also tested in JDeveloper 12.2.1.2. Here SQL Developer Version 18.1.0 which is a the current version as of this writing (July 2018). All schema artifacts will be compared (tables, indexes, procedures, packages, sequences and, functions). In the use case described here there are two Oracle database schemas compared, one in DEV and the other in TEST. This topic is not a comparison of SQL Developer/JDeveloper to schema migration tools like Liquibase and Flyway but instead, a quick tutorial on leveraging this widely adopted Oracle tool for the list of schema differences. SQL Developer/JDeveloper will do this quickly and effectively. However, there are times when you simply want to list the differences between two schemas quickly, producing a "Diff Report" and optionally to create the SQL to show the alters necessary to upgrade the destination schema. ![]() Undoubtedly for large database schema installations commercial schema migration tools like Liquibase or Flyway makes sense. The tools provide a database agnostic means to do this and to perform schema rollbacks if necessary. The tools provide a very controlled means of migrating schema changes from DEV to TEST and to PROD, the goal to preserve the underlying data. Liquibase by Datica and Flyway by Boxfuse are two such commercial tools. There are a class of tools whose job it is to managed database schema changes and provide the ability through the tool's own change logs to implement the changes to higher environments.
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