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gc current grant 2-way

Short Description

Indicates that no current block was received because it was not cached in any instance. Instead a global grant was given, enabling the requesting instance to read the block from disk or modify it.

Detailed Description​

This is a RAC wait. This indicates that no current block was received because it was not cached in any instance. Instead a global grant was given, enabling the requesting instance to read the block from disk or modify it.

In RAC wait event names:

  • gc denotes the Global Cache service
  • current - is for DML operations
  • cr - is for select operations
  • 2-way indicates another node is master

The difference between CR and Current is that CR requires a block with a given SCN, whereas current does not (current mode fetches the block with the current SCN).

How to reduce this wait​

Not available yet. Contributions welcome.

Oracle RAC Docs - Monitoring Performance

Oracle RAC Docs - RAC Wait Events

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