The following logs and files occupy RDS storage space.

**Table 1** MySQL database file types
DB Engine	File Type
MySQL	Log files: database undo-log, redo-log, and binlog files
	Data files: database content files and index files
	Other files: ibdata, ib_logfile0, and temporary files

**Table 2** PostgreSQL database file types
DB Engine	File Type
PostgreSQL	Log files: database error log and transaction log files
	Data files: database content, index, replication slot data, transaction status data, and database configuration files
	Other files: temporary files

**Table 3** Microsoft SQL Server database file types
DB Engine	File Type
Microsoft SQL Server	Log files: database error log, transaction log, and trace files
Microsoft SQL Server	Data files: database content files

If the original storage space is insufficient as your services grow, scale up storage space of your DB instance.
If data occupies too much storage space, run DROP, TRUNCATE, or DELETE+OPTIMIZE TABLE to delete useless historical table data to release storage space. If no historical data can be deleted, scale up your storage space.
If temporary files generated by sorting queries occupy too much storage space, optimize your SQL query statements.
1. A large number of temporary files are generated if there are a large number of sorting queries executed by applications.
2. A large number of binlog files are generated and occupy space if there are large amounts of insert, delete, and update operations in a short period.
3. A large number of binlog files are generated if there are a large number of transactions and write operations.
Use Cloud Eye to monitor the size, usage, and utilization of storage space of your DB instance and set alarm policies.

Which Types of Logs and Files Occupy RDS Storage Space?