# Database guides > 原文：[https://docs.gitlab.com/ee/development/database/](https://docs.gitlab.com/ee/development/database/) * [Database Reviews](#database-reviews) * [Tooling](#tooling) * [Migrations](#migrations) * [Debugging](#debugging) * [Best practices](#best-practices) * [Case studies](#case-studies) # Database guides[](#database-guides "Permalink") ## Database Reviews[](#database-reviews "Permalink") * 如果您要创建数据库 MR 进行审查，请查看我们的[数据库审查指南](../database_review.html) . 它介绍了与数据库相关的更改，迁移和复杂的 SQL 查询. * 如果您是数据库审阅者或想成为一名数据库审阅者，请查看我们的数据库审阅[简介](database_reviewer_guidelines.html) . ## Tooling[](#tooling "Permalink") * [Understanding EXPLAIN plans](../understanding_explain_plans.html) * [explain.depesz.com](https://explain.depesz.com/)或[explain.dalibo.com，](https://explain.dalibo.com/)用于可视化`EXPLAIN`的输出 * [pgFormatter](http://sqlformat.darold.net/) PostgreSQL SQL 语法美化器 ## Migrations[](#migrations "Permalink") * [What requires downtime?](../what_requires_downtime.html) * 用于 SQL 查询的[SQL 准则](../sql.html) * 用于创建安全的 SQL 迁移的[迁移样式指南](../migration_style_guide.html) * [Testing Rails migrations](../testing_guide/testing_migrations_guide.html) guide * [Post deployment migrations](../post_deployment_migrations.html) * [Background migrations](../background_migrations.html) * [Swapping tables](../swapping_tables.html) * [Deleting migrations](../deleting_migrations.html) ## Debugging[](#debugging "Permalink") * 使用带有[Marginalia 的](../database_query_comments.html)查询注释来跟踪 SQL 查询的源 * 使用[详细查询日志](https://guides.rubyonrails.org/debugging_rails_applications.html#verbose-query-logs)在 Rails 控制台中跟踪 SQL 查询的源 ## Best practices[](#best-practices "Permalink") * [Adding database indexes](../adding_database_indexes.html) * [Foreign keys & associations](../foreign_keys.html) * [Adding a foreign key constraint to an existing column](add_foreign_key_to_existing_column.html) * [`NOT NULL` constraints](not_null_constraints.html) * [Strings and the Text data type](strings_and_the_text_data_type.html) * [Single table inheritance](../single_table_inheritance.html) * [Polymorphic associations](../polymorphic_associations.html) * [Serializing data](../serializing_data.html) * [Hash indexes](../hash_indexes.html) * [Storing SHA1 hashes as binary](../sha1_as_binary.html) * [Iterating tables in batches](../iterating_tables_in_batches.html) * [Insert into tables in batches](../insert_into_tables_in_batches.html) * [Ordering table columns](../ordering_table_columns.html) * [Verifying database capabilities](../verifying_database_capabilities.html) * [Database Debugging and Troubleshooting](../database_debugging.html) * [Query Count Limits](../query_count_limits.html) * [Creating enums](../creating_enums.html) ## Case studies[](#case-studies "Permalink") * [Database case study: Filtering by label](../filtering_by_label.html) * [Database case study: Namespaces storage statistics](../namespaces_storage_statistics.html)