Journaling

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Hey everyone.

I have noticed that my backup mirror is warning that the MirrorDatabaseLatencyTime is having a bad time (time in ms is 3000, and warnvalue is 3000). While I look into what may be causing this latency between the two servers, I was considering if reducing the size of the journal files would improve this value in any way.

My assumption is that reducing the file size would mean that the frequency of the journal files being created would be increased, but the reduced size would mean that the transfer and application of each file would be reduced.

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Hi,

We are using CACHE 2017.2.1, I would like to retrieve data from Journal for killed global. Let say we have global name ^ EMP(123) with data and also have some child nodes and it has been killed by using cache kill command for some reason and we don't know who has executed this and when. My questions are below.

1) Can we get back the data of killed global from journal files,Is it possible or not ?

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In this article I'd like to share with you a phenomena that is best you avoid - something you should be aware of when designing your data model (or building your Business Processes) in Caché or in Ensemble (or older HealthShare Health Connect Ensemble-based versions).

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Question
Augusto Estefan · Mar 30, 2020
Error Switching Journal

Hi, 

I'm having a problem when I'm attempting to freeze the instance.

I have a pre-script and post-script to freeze and unfreeze the instance, but when the script execute: 

 csession INSTANCE_NAME -U '%SYS' "##Class(Backup.General).ExternalFreeze(\"$SNAPLOG\",,,,,,1800)"

 It's give me this error and fails the freeze: 

Backup.General.ExternalFreeze: Failed, Unable to switch local journal file, Error: -99,ERROR #1142: Error switching journal file: 0
vi

 

At cconsole.log file show this:

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Currently we are using Health Share 2015.2.2, and looking to upgrade to the latest version in the next month.

From what I understand we have to upgrade to 2017 or 2018 prior to going to 2019.1 since 2019.1 is on the IRIS platform.

In trying to outline my steps in the upgrade process I came up with a question.

  • Can a Full System Backup from 2015.2.2 be restored into 2019.1?
  • Do I have to restore the 2015.2.2 back up into 2017 or 2018, then do the 2019.1 conversion?

Has anyone had experience with this? or should I open a ticket with WRC?

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I'm a DBA and support Caché databases on AIX. I coded shell scripts for monitoring journaling status, databases size, license end date.

We recently got a new instance of Caché on Windows. I'm just curious to know whether anyone coded database monitoring scripts on Windows using PowerShell or any other scripting language.

If yes, please share the details.

 

Thanks & Regards,

Bharath Nunepalli.

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Just wondering if anyone knows if there is a way to get daily emails or alerts about changes to a cache database.  I know that all of that information is contained within the journal files, just wondering if there is a way to bundle it up each day and send it off for auditing, etc.

Any solution where a plain-text/readable format of changes to the cache database could be sent or stored for review would solve the issue.

 

Thanks!

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Question
lw wei · Jul 17, 2019
journal restore failed with ZJRNFILT

The steps are as follows:

 

1. create global

 For I=1:1:200 Set ^ABC(I)=""
 For I=1:1:200 Set ^XYZ(I)=""
 For I=1:1:100 Kill ^ABC(I)

2. create ZJRNFILT

ZJRNFILT(jid,dir,glo,type,restmode,addr,time)    /*Filter*/
  Set restmode=1                                  /*Return 1 for restore*/
  If glo["^ABC",type="K" Set restmode=0           /*except if a kill on ^ABC*/
  Quit
  ;

 

3. restore

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Hello, community!

I've stumbled on some unexpected behavior, and decided to check with you if this is normal. Basically, I'm rebuilding indices and the result is not journaling (which leads to missing indices at shadow server).

The $ZV is "Cache for UNIX (Red Hat Enterprise Linux for x86-64) 2015.2.1 (Build 705U) Mon Aug 31 2015 16:53:38 EDT"

I have an example class 

Class tmp.A As %Persistent;

Index IP1 On P1;

Property P1 As %String;

for example there is one object which have P1 = 1, so

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Hi,

We have Mirroring established between NODE 1 & Node 2 . We have set the "cachesys" database enabled for Journalling. But we dont see the User Accounts , Roles, Resources created on Node 1 ( favoured Primary) reflected on Node 2 . Is creating them manually again is the only option for this ? . Is there any way to sync them or would adding %SYS to MIRROR a possible solution. Would it be great if anyone has faced this as we have an issue that during failovers Team is locked out . 

Best Regards,

Arun Madhan

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I'm working on a task where I need to apply journal file records to another database. I can't use Journal.Restore class methods as I need to perform some data transformation, therefore I'm reading journal file record by record using %SYS.Journal.Record API.  

It seems that there are only few journal records that I need to process, namely:

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In System Administration | Configuration |  System Configuration | Journal Settings there is a check box for Freeze on error.

From reading the documentation, it sounds like the choice to freeze on error is one of system availability vs system integrity.

Curious to know whether Ensemble users choose to freeze on error or not.

If you have a best practice recommendation based upon your experience or knowledge, that would be helpful information too.

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Currently, we are running 2014.1 on two different servers (OpenVMS, RHEL). The plan is to transition from OpenVMS to RHEL, but our Write Daemon is in a Troubled state on both servers.

On the OpenVMS server, we have a WIJ file that's 26G and can grow to 40G (size of database cache). Since it hasn't grown to 40G, we don't believe the size of the WIJ file to be the issue.

What else should we be looking at regarding the performance of the Write Daemon?

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I'm purging a lot of management data from an Ensemble production, which is creating 100s of GBs of journals. Has anybody succeeded in disabling journaling on an Ensemble purge? The user interface doesn't have an option for this, but I'm thinking you might be able to identify the process and externally disable journaling on it.

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Question
Rafael Vergani · Mar 21, 2017
Journal file I/O error

One of my journal spaces has status "IOER" in MSM MUMPS.

I think this is happend during system freeze.

 

 

I never seeing a journal file status like that.  I did not find anything about it in the intersystems documentation.

I can simply delete the damaged file, but I'd like to know how to prevent this from happening.

Anyone have some idea about it?

My MSM-UNIX Version is 4.4.0.

Thanks

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We are finally planning to migrate some ancient Caché applications that are run on Caché 5.0.21 to a new server with Caché 2016.2.0 or so.

I wonder if we could use Shadowing between those to keep the data on the new server up to date?

We would copy the Caché backup from the old environment to the new and do a RESTORE there and then start shadowing.

I know than 5.0.21 is no more officially supported by ISC.

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