78 lines
3.7 KiB
Markdown
78 lines
3.7 KiB
Markdown
---
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stage: Data Stores
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group: Database
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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---
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# Database guides
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## Database Reviews
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- If you're creating a database MR for review, check out our [Database review guidelines](../database_review.md).
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It provides an introduction on database-related changes, migrations, and complex SQL queries.
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- If you're a database reviewer or want to become one, check out our [introduction to reviewing database changes](database_reviewer_guidelines.md).
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## Tooling
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- [Understanding EXPLAIN plans](../understanding_explain_plans.md)
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- [explain.depesz.com](https://explain.depesz.com/) or [explain.dalibo.com](https://explain.dalibo.com/) for visualizing the output of `EXPLAIN`
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- [pgFormatter](https://sqlformat.darold.net/) a PostgreSQL SQL syntax beautifier
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- [db:check-migrations job](dbcheck-migrations-job.md)
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## Migrations
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- [Migrations for multiple databases](migrations_for_multiple_databases.md)
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- [Avoiding downtime in migrations](avoiding_downtime_in_migrations.md)
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- [SQL guidelines](../sql.md) for working with SQL queries
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- [Migrations style guide](../migration_style_guide.md) for creating safe SQL migrations
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- [Testing Rails migrations](../testing_guide/testing_migrations_guide.md) guide
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- [Post deployment migrations](post_deployment_migrations.md)
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- [Background migrations](background_migrations.md)
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- [Swapping tables](../swapping_tables.md)
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- [Deleting migrations](deleting_migrations.md)
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- [Partitioning tables](table_partitioning.md)
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## Debugging
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- Tracing the source of an SQL query using query comments with [Marginalia](../database_query_comments.md)
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- Tracing the source of an SQL query in Rails console using [Verbose Query Logs](https://guides.rubyonrails.org/debugging_rails_applications.html#verbose-query-logs)
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## Best practices
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- [Adding database indexes](../adding_database_indexes.md)
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- [Foreign keys & associations](../foreign_keys.md)
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- [Adding a foreign key constraint to an existing column](add_foreign_key_to_existing_column.md)
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- [`NOT NULL` constraints](not_null_constraints.md)
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- [Strings and the Text data type](strings_and_the_text_data_type.md)
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- [Single table inheritance](../single_table_inheritance.md)
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- [Polymorphic associations](../polymorphic_associations.md)
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- [Serializing data](../serializing_data.md)
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- [Hash indexes](../hash_indexes.md)
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- [Storing SHA1 hashes as binary](../sha1_as_binary.md)
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- [Iterating tables in batches](../iterating_tables_in_batches.md)
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- [Insert into tables in batches](../insert_into_tables_in_batches.md)
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- [Ordering table columns](../ordering_table_columns.md)
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- [Verifying database capabilities](../verifying_database_capabilities.md)
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- [Database Debugging and Troubleshooting](../database_debugging.md)
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- [Query Count Limits](../query_count_limits.md)
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- [Creating enums](../creating_enums.md)
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- [Client-side connection-pool](client_side_connection_pool.md)
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- [Updating multiple values](setting_multiple_values.md)
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- [Constraints naming conventions](constraint_naming_convention.md)
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- [Query performance guidelines](../query_performance.md)
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- [Pagination guidelines](pagination_guidelines.md)
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- [Pagination performance guidelines](pagination_performance_guidelines.md)
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- [Efficient `IN` operator queries](efficient_in_operator_queries.md)
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- [Data layout and access patterns](layout_and_access_patterns.md)
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## Case studies
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- [Database case study: Filtering by label](../filtering_by_label.md)
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- [Database case study: Namespaces storage statistics](../namespaces_storage_statistics.md)
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## Miscellaneous
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- [Maintenance operations](maintenance_operations.md)
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- [Update multiple database objects](setting_multiple_values.md)
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