TopicsinDatabaseVersionControl€¦ · Agilex Centralvs.Distributed!...

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Topics in Database Version Control

Dominic Delmolino


Dominic Delmolino !  Oracle database technologist / engineer since 1990 !  Former

!  Member of Oracle’s System Performance Group !  CTO of Savant CorporaDon !  Director of Database Engineering at Network SoluDons

!  Current !  Member of OakTable !  Oracle Ace !  Vice President of Database Architecture and Engineering, Agilex Technologies

!  Social !  Blog at OracleMusings.com (infrequently) !  @ddelmoli on TwiSer

!  Author !  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


Sync vs. Directed Applica:on

!   Sync – Uses a reference model and diff process

!   Directed ApplicaDon – Uses a changeset model and directed scripDng


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)


Reference and Volume Data Management

!   Reference Data !   Similar to Sync vs. Directed ApplicaDon problem

!   Data Volume !   StaDsDcs, plans, good queries vs. bad queries


Trends in SCM / CI

! Git vs. Subversion !   Code Reversion !   TDD


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



!   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



!   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



!   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


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


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


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


Reference Data

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


Reversion

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


TDD

!   Can DDL be TDD’d? !   Rule asserDons like those in SQL Developer Data Modeler

!   Naming standards? !   Standard abbreviaDon list?


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


Building

!   CI process that produces success / failure indicators

!   Temporary build workspaces and arDfacts !   JPA generaDon? camelCase vs. column name vs. standard abbreviaDons?


QuesDons? Dominic Delmolino [email protected] @ddelmoli

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