183 questions
1
vote
1
answer
189
views
Failed connecting to ASM as SYSASM and as SYSDBA ORA-01005: null password given; logon denied? AWS DMS Endpoint Error
I am currently working with AWS DMS services and need to create an Oracle endpoint with an ASM (Automatic Storage Management) connection. However, the connection is failing, and the following error is ...
0
votes
1
answer
240
views
Replicated & Distributed Clickhouse - Keeper Replication
I need to create the replication in clickhouse; on two different machines that are under the same network. I have tried to configure it but I have the following error:
SQL Error [999] [07000]: Code: ...
0
votes
1
answer
55
views
Load pre-training parameters trained on a single GPU on multi GPUS on a single machine
I tried to load the pre-training parameters trained by a single GPU on a single machine with multiple GPUs, but errors such as Missing keys and Unexpected keys occurred.
backbone_cfg = dict(
...
0
votes
0
answers
98
views
Mongodb transaction if document has multiple copies
Consider I have a document A in the MongoDB database with multiple copies (as it is a distributed db, partition P1 and P2 has same entry A)
Given there is single document transaction in Mongo, if I ...
0
votes
1
answer
189
views
What happens to long running clickhouse updates if the client dies?
Column type modifications in clickhouse can take a long time, since clickhouse has to migrate all data to the new type. Let's say a jdbc client initiates a column type update, and then the jvm process ...
- 602
0
votes
1
answer
129
views
Legal Hierarchical Quorums in Zookeeper
I am trying to understand hierarchical quorums in Zookeeper. I may not understand the example shown in the documentation (here). Are votes [from at least two servers from each of two different groups] ...
- 13
4
votes
1
answer
1k
views
How to handle data migrations in distributed microservice databases
so im learning about microservices and common patterns and i cant seem to find how to address this one issue.
Lets say that my customer needs a module managing customers, and a module managing ...
- 1,192
1
vote
1
answer
599
views
The relationship between Paxos family and data consistency
Paxos, a kind of consensus algorithm, plays a vital role in distributed database systems. It can be used to make the distributed system chooses the same proposal. Data consistency is a big problem in ...
- 13
3
votes
2
answers
5k
views
What is meant by Distributed System?
I am reading about distributed systems and getting confused with what is really means?
I understand on high level, it means that set of different machines that work together to achieve a single goal.
...
- 1,686
2
votes
1
answer
409
views
Add on-premise CockroachDB node to a cluster hosted in Kubernetes
I'm planning to deploy a small Kubernetes cluster (3x 32GB Nodes). I'm not experienced with K8S and I need to come up with some kind of resilient SQL database setup and CockroachDB seems like a great ...
- 119
0
votes
1
answer
109
views
Creating and migrating a devise-driven User model in a main/replica context
The following main/replica database structure
development:
primary:
<<: *default
database: users_development
username: deploy_root
password: password
host: "localhost&...
- 6,473
1
vote
1
answer
1k
views
Strong consistency and replication factor
I am trying to improve my knowledge in distributed databases and the various levels of consistency that could be achieved. First, let me define some terms I will use (please, tell me if I am wrong):
...
- 13
0
votes
0
answers
410
views
Does 1 phase commit make sense in distributed systems?
I'm trying to understand what is the difference between 1 and 2-phase commit and why 1phase commited does not make sense distributed systems. From my understanding here they are:
In 1 phase commit ...
- 27.8k
0
votes
1
answer
840
views
What is system.size_estimates in cassandra and plausible reasons behind high disk consumption
I've been using cassandra on two nodes where one of them ran out of disk space and went down. When I checked, I've observed the size of size_estimates to be ~30GB.
I've removed sstable files from my ...
- 31
1
vote
1
answer
747
views
How the hash function by partitioner in Cassandra is decided for a particular data set to ensure even distribution of data across multiple cluster?
As we know from Cassandra's documentation[Link to doc] that partitioner should be such that the data is distributed evenly across multiple nodes to avoid read hotspots. Cassandra offers various ...
- 2,805