Unanswered Questions

17
votes
1answer
653 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: ...
9
votes
1answer
188 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
122 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. ...
7
votes
0answers
738 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
2answers
756 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 ...
7
votes
1answer
339 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
214 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 ...
6
votes
0answers
241 views

Storing and querying rolling data in PostgreSQL

I have a large quantity of weather model data being put into a PostgreSQL database. The machine has 8 cores and 16 GB of RAM. I'm running PostgreSQL 9.3 with PostGIS 2.1. Each table will have a ...
6
votes
0answers
155 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
1k 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
0answers
72 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
2answers
140 views

AlwaysOn Availability Groups 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
133 views

Modification to GEQO (Genetic Query Optimization) of PostgreSQL

I need to implement a functionality that is in line with the GEQO functionality of PostgreSQL. I understand that GEQO approach is to encode query plans as integer strings and GEQO generates these ...
5
votes
2answers
391 views

SQL Server Full Text Search - .rtf files incorrectly indexed by rtf tags

I've set up a full-text index on my SQL Server DB on a varbinary(max) column. I have a type column specified, which contains the extension of the file, such a ".doc", ".pdf" etc. However, I have ...

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