Cursor sharing in Oracle is a feature that allows multiple sessions to share the same cursor, which can improve performance by reducing the overhead of parsing and optimizing statements. Oracle can share cursors for the following types of statements: Oracle uses a library cache to store shared cursors. When a session executes a statement, Oracle […]
Cache Fusion is a fundamental technology in Oracle Real Application Clusters (RAC) that facilitates efficient data sharing and synchronization between the instances or nodes in a clustered database environment. It plays a crucial role in maintaining data consistency, minimizing contention, and optimizing performance in Oracle RAC. Here’s how it works and the benefits it offers: […]
So, in summary, the files and processes involved in the Oracle Clusterware startup sequence are as follows: Oracle Clusterware startup sequence involves a carefully orchestrated process of initializing key components, accessing configuration information, discovering critical cluster resources like the voting disk, retrieving the ASM SPFILE from disk headers, and finally, starting the ASM instance and […]
USABLE_FILE_MB in v$asm_diskgroup can be negative for a number of reasons. The most common reason is that the disk group does not have enough free space to meet the redundancy requirements of its files. For example, if a disk group is configured with NORMAL redundancy, then each file in the disk group must have two […]