Unanswered Questions

17
votes
1answer
534 views

How to calculate/store Top 10 in a tabular model?

We have recently created an SSAS tabular model so our users can access it via PowerView. We have a measure on one of our fact tables to get the TotalActiveItems using a formula: ...
14
votes
0answers
3k views

MySQL 5.1.66 SSL connection error ERROR 2026 (HY000)

UPDATE2 Using WireShark I found out the problem string (I hope I did): 28 | 9.582638 | 192.168.18.128 | 192.168.18.129 | MySQL Response Error 1043 And the error is (according to docs): Error: ...
8
votes
1answer
115 views

Clustered Columnstore indexes in SQL Serer 2014 for data warehousing

I am performance tuning a DWH using indexes. I Am fairly new to SQL Server 2014. MS describes the following: "We view the clustered columnstore index as the standard for storing large data ...
8
votes
0answers
176 views

Busy table is not getting vacuumed

We're using Postgres 9.2 on Windows to store low-frequency timeseries data: we're inserting around 2000 rows per second every second 24 hours, 7 days a week with no downtime. There is a DELETE that ...
7
votes
0answers
599 views

How do I determine if a SSIS transform is non-blocking, partially blocking, or fully blocking?

There are several blogs which claim to categorize SSIS Transforms into blocking (asynchronous), non-blocking(synchronous) and partially blocking(asynchronous). When looking into the specific ...
7
votes
1answer
328 views

Designing Simple Schema for Disaggregation of Demand Forecast

I am doing a simple database design task as a training exercise where I have to come up with a basic schema design for the following case: I have a parent-child hierarchy of products (example, Raw ...
6
votes
0answers
82 views

Troubleshooting THREADPOOL Waits

From everything I have read, THREADPOOL waits occur when a task is waiting for a worker thread. A high amount of THREADPOOL waits typically means you are running out of available worker threads. ...
6
votes
1answer
671 views

Migrate heroku database to Amazon RDS with minimum downtime

I have a heroku postgres database and want to migrate it to Amazon RDS to save cost. What's a way to do so with minimum downtime? Usually this involves replicating database in real time and then ...
6
votes
0answers
153 views

9i streams capture doesn't evaluate rules

I have a streams replication set up between two oracle 9.2.0.8 instances as sources and an 11g instance as a destination, processing a small subset of data from each database (let it be one table ...
6
votes
1answer
993 views

SQL-08S01 error in FreeTDS/Azure when executing stored proc for a few minutes from Linux (but not from Windows)

I get this error on Linux (Ubuntu and CentOS) when executing a stored proc from Perl/DBI/ODBC/FreeTDS to SQL Azure: [unixODBC][FreeTDS][SQL Server]Read from the server failed (SQL-08S01) I don't ...
5
votes
2answers
265 views

Terrible Bad Query Plan

I have a weird query plan problem. I have two databases (Let's call them DB1 and DB2) where both are sitting in the same SQL-Server instance and have identical schema. In there, we have a couple ...
5
votes
0answers
285 views

Find active values of SQLNET.ORA parameters on server

How can I find the active values of SQLNET.ORA parameters on the server? I know how to find the SQLNET.ORA file but there's no guarantee the values in that file are actively used. Parameter changes ...
5
votes
0answers
61 views

How to handle bad query plan caused by exact equality on range type?

I'm performing an update where I require an exact equality on a tstzrange variable. ~1M rows are modified, and the query takes ~13 minutes. The result of EXPLAIN ANALYZE can be seen here, and the ...
5
votes
0answers
113 views

SQL Server AlwaysOn log_send_rate

On all our AlwaysOn setups, running Windows 2012 and SQL Server 2012 in virtual machines and on bare-metal, I find that the log_send_rate in sys.dm_hadr_database_replica_states is consistently ...
5
votes
0answers
154 views

Fast hamming distance queries in postgres

I have a large database (16M rows) containing perceptual hashes of images. I'd like to be able to search for rows by hamming distance in a reasonable timeframe. Currently, as far as I properly ...

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