LOXODATA

@l_avrot

WHY ARE DBAS SO GRUMPYALL THE TIME ?

NORDIC PGDAY 2018-03-12

Lætitia AVROT Loxodata

 LOXODATA

@l_avrot

WHO

Lætitia Avrot

PostgreSQL consultant and teacherDBA PostgreSQL for more than 10 years (and also Oracle and SQL Server)@l_avrot

 LOXODATA

@l_avrot

LOXODATA

Company built on 3 essential pillars

PostgreSQL DevOps Cloud

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@l_avrot

Why are DBAs so grumpy all the time ?

Messing up from the beginningWorst developper's practicesOps can mess up too!

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THE DESIGN

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Remove potential interferences

Don't tell people about your projectDon't tell "ops" about your projectKeep your DBA busy (with production)

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@l_avrot

The more complex, the more fun!

Replication (multimaster, synchronous, logical...)Authentication (AD, LDAP)External data sources (Datalinks, FDW, ETL...)

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Complexity by example

A simple websiteShows the company canteen menu each day

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Complexity by example

Adding external authenticationAdding synchronous replicationAdding "0 administration architecture"Adding Backup and Monitoring tools

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Complexity by example

Adding Elastic search for full text searchAdding data from old applicationAdding logical replication for BI App

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Cost reduction

Mutualization50+ instances running on the same serverOne database per instance

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Docker is the new black

Does everything!Composing ? What for ?Backing up ? What for ?

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"Bad" docker by example

2 dockers on same VM1 PostgreSQL instance per containerWith streaming replication : call it hight availability!

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APPLICATION DEVELOPMENT

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ORMs

Let your ORM choose which model you needActivate indexing

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Model

1st Normal FormDrop constraints, your app can handle it!Don't normalize : call it denormalization!

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Be trendy : try schemaless!

Easier, faster, lighter!Mongo can do it!Store a lot : call it Big Data!You can fake a model too: Entity, Attribute, Value

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Time series

Store current and archive data on same tableNo partitioning, of course!No purge ever : you need all your data!

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Joins

Grab list of ids from �rst tableLoop on it and query on the second tableIf it's slow, blame the database!

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Transactions, commits, locks and so on

Open transactions and leave it openAsk for explicit commit and never commitPostgres can't manage correct locks : use explicit locks!

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OPS

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Backups

Don't need (replication, disk miroring, VM snapshots)Only logicalHome made!No testing required

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Monitoring

Graphs are for weaklings!Provide graphs without unit or legendTake one measure per day, it's quite enough!

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@l_avrot

"Cleaning" $PGDATA

pg_xlog/pg_walpg_cloguse pg_resetwal

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RDBMS are magic!

No DBA neededNothing to understand: it's just magic!No maintenance needed!

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Autovacuum

Setting it offautovacuum_*_scale_factor=0autovacuum_*_threshold=100000

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Hide behind ITIL!

Strip the DBA off any permissionOne change per month, no more6-months validation process for a minor update

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CONCLUSION

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@l_avrot

If you're a DBA...

Improve your communicationSmileAppease others

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@l_avrot

If you're not a DBA...

Improve your communicationSmileDon't let fear take control of you!

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@l_avrot

All we need is love!

: last friday of July : 256th day of the year

: �rst friday of July

Sysadmin appreciation dayDay of the ProgrammerDBA appreciation day

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@l_avrot

Questions ?

Thanks to Paul S Randall for the inspiration

Thanks to Freepik and Pixabay for illustrations and photos

 LOXODATA

@l_avrot

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