Topics in Database Version Control. Dominic Delmolino

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1 Topics in Database Version Control Dominic Delmolino

2 Dominic Delmolino! Oracle database technologist / engineer since 1990! Former! Current! Social! Author! Member of Oracle s System Performance Group! CTO of Savant CorporaDon! Director of Database Engineering at Network SoluDons! Member of OakTable! Oracle Ace! Vice President of Database Architecture and Engineering, Technologies! Blog at OracleMusings.com on TwiSer! Strategies and Techniques for Oracle ReplicaDon (1995)! Chapter on Parallel PL/SQL programming in Expert PL/SQL PracDces! CerDficaDons! Oracle Exadata CerDfied ImplementaDon Specialist! Cloudera CerDfied Developer for Apache Hadoop

3 Sync vs. Directed Applica:on! Sync Uses a reference model and diff process! Directed ApplicaDon Uses a changeset model and directed scripdng

4 Central vs. Distributed! Central Database all developers work against a single instance! Distributed all developers work against a private database! Hybrid! Private schemas! Private Pluggable Databases (12c)

5 Reference and Volume Data Management! Reference Data! Similar to Sync vs. Directed ApplicaDon problem! Data Volume! StaDsDcs, plans, good queries vs. bad queries

6 Trends in SCM / CI! Git vs. Subversion! Code Reversion! TDD

7 Shared (Central) vs. Private (Distributed)! Central! Pros! Easy to share load and reference data! Immediate integradon J! Visibility by DBAs into poor code! Cons! Locking! PotenDally deferred SCM! Breakage

8 Shared (Central) vs. Private (Distributed)! Distributed! Pros! Private sandbox for tesdng! No locking! Same connecdon string for all developers! Cons! Need good CI / SCM process! Limited data! Limited oversight / guidance capability

9 Shared (Central) vs. Private (Distributed)! Private Schemas! Pros! Private sandbox for tesdng! No locking! Oversight capability! Cons! Different connecdon strings for each developer! Need good CI! Limited data! Schema name proliferadon may limit branching capabilides

10 Shared (Central) vs. Private (Distributed)! Pluggable Databases! Pros! Private sandbox for tesdng! No locking! Oversight capability! Cons! Different connecdon strings for each developer (but schema names can be the same)! Need good CI! Limited data

11 Sync vs. Directed Applica:on! Sync! Comments! Based on diff ing reference model with current model! Some ORM tools do this (i.e., Hibernate verify)! Pros! Good tooling based on exisdng schema diff tools (i.e., Schema Compare for Oracle, Source Code Control for Oracle)! Easy to create / maintain a reference PDM! Cons! Limited control over how to apply changes! Limited rollback capabilides

12 Directed Applica:on! Directed ApplicaDon! Comments! Developers write code to apply changes to a schema! Called changesets (liquibase), migradons (ruby) or refactoring scripts! Pros! Good for tracking who did what when and why! More opdons for rollback! More control over how change is applied! Slightly beser integradon with CI tools! Cons! Hard to maintain a reference PDM! Not as good for full rebuilds! Limited, unfamiliar tooling

13 Trends in SCM! My background is with SCCS and older tools! SVN! Git! GitHub / Bitbucket popularity! Rise of distributed version control! Local workspaces! Full stack copy of environment for every developer! Local repository

14 Reference Data! Data as Code! Controlled via SCM! Would be nice if dbdoc type generators could produce reference data output as well

15 Reversion! How do we revert database code?! More importantly, how do we test DDL changes before deploying them?

16 TDD! Can DDL be TDD d?! Rule asserdons like those in SQL Developer Data Modeler! Naming standards?! Standard abbreviadon list?

17 Branching! Can this be used to do TDD?! Local vs. origin vs. master?! Schema_Name[suffix]! MulDple copies of the schema! Suffix maps to a branch name?! Reference schema from ERD Model?! Local work schema! Official schema

18 Building! CI process that produces success / failure indicators! Temporary build workspaces and ardfacts! JPA generadon? camelcase vs. column name vs. standard abbreviadons?

19 QuesDons? Dominic

DBdeployer. About the Speaker: CJ Estel, Operations Database Engineer CoverMyMeds cj@cjestel.net

DBdeployer. About the Speaker: CJ Estel, Operations Database Engineer CoverMyMeds cj@cjestel.net DBdeployer About the Speaker: CJ Estel, Operations Database Engineer CoverMyMeds cj@cjestel.net Github: https://github.com/covermymeds/dbdeployer https://github.com/cjestel Company Tech Blog: https://www.scriptscribe.org/