面试题与答案

Optimization techniques include using indexes, proper query design, and analyzing query execution plans.

A stored procedure is a set of SQL statements stored in the database and executed as a single unit. You can create one using the CREATE PROCEDURE statement.

You can use the pg_dump utility to create a backup and the pg_restore utility to restore the database from a backup file. Additionally, you can use the pg_basebackup tool for physical backups.

Concurrency control techniques include using transactions, locks, and isolation levels to ensure data consistency and prevent conflicts between multiple transactions.

The pg_stat_statements module provides statistics about SQL statements executed by a server, helping identify slow queries and optimize database performance.

PostgreSQL provides the tsvector and tsquery data types along with the full-text search functions. To implement full-text search, you can use the tsvector column for indexing and the @@ operator for searching.

The pg_upgrade utility is used to upgrade a PostgreSQL database cluster to a new major version without requiring a full dump and restore. It simplifies the upgrade process.

PostgreSQL supports various replication methods, including streaming replication and logical replication. Streaming replication is a physical replication method, while logical replication replicates changes at the SQL level.

Table partitioning involves dividing a large table into smaller, more manageable pieces called partitions. It can improve query performance, simplify data management, and enhance maintenance operations.