What are the Most Efficient SQL Queries for Testing Database Connection Idleness Across Diverse Platforms?

Efficient SQL Test Queries for Diverse Databases

When it comes to testing database connection idleness in connection pooling libraries, it is crucial to use database-agnostic queries that provide equivalent efficiency across different platforms.

According to research and insights shared in the community, the following queries have been found to be effective for specific database providers:

• MySQL, H2, SQL Server, PostgreSQL, SQLite, Hive: SELECT 1
• Oracle: SELECT 1 FROM DUAL
• HSQLDB: SELECT 1 FROM any_existing_table WHERE 1=0 or SELECT 1 FROM INFORMATION_SCHEMA.SYSTEM_USERS or CALL NOW()
• Apache Derby: VALUES 1 or SELECT 1 FROM SYSIBM.SYSDUMMY1
• DB2: SELECT 1 FROM SYSIBM.SYSDUMMY1
• Informix: select count(*) from systables

Since a single query suitable for all databases may not exist, these specific queries can be programmed into connection pooling libraries, allowing for automatic selection based on the detected database provider. This approach provides both efficiency and flexibility, ensuring reliable connection testing across diverse SQL databases.

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