The forum will experience an outage sometime between February 10 at 7:00pm EST and February 12 at 11:59 EST for installation of security updates. The actual time and duration of the outage are unknown but attempts will be made to minimize the downtime. We apologize for any inconvenience.

This question is asking "Is it safe?"

SQL Anywhere 12 doesn't have NODE=MIRROR, and the V12 Help describes NODE=COPY as applying only to read-only scale-out copy nodes.

However, it does seem like NODE=COPY on a V12 connection in a High Availability setup involving only primary and secondary (mirror) databases (no copy nodes) can be used to prevent a read-only connection to the mirror from reconnecting to the primary in update mode when the mirror server crashes.

In other words, if the mirror crashes, NODE=COPY prevents all those roque queries from being loaded onto the primary database.

When the mirror is restarted, and reassumes its duties as mirror, the NODE=COPY connections can be reestablished.

asked 27 Oct '13, 12:20

Breck%20Carter's gravatar image

Breck Carter
26.6k418575824
accept rate: 21%

I don't have an answer but would like to note that 12.0.1 does have NODE=MIRROR and NODE=READONLY, so your question seems to hold for 12.0.0... - cf. this doc hint from the "What's new in version 12.0.1" section:

NodeType (NODE) connection parameter enhancement The NodeType connection value now supports MIRROR and READONLY values:

  • MIRROR Redirects the application to the tenant's mirror database.
  • READONLY Redirects the application to any read-only database copy: either a copy node or the mirror copy. If there are no read-only copy nodes, READONLY is equivalent to the MIRROR setting. If there are only read-only copy nodes, READONLY is equivalent to the COPY setting.
(28 Oct '13, 05:41) Volker Barth
Be the first one to answer this question!
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×37

question asked: 27 Oct '13, 12:20

question was seen: 534 times

last updated: 28 Oct '13, 05:48