0
votes
0answers
34 views

Avoid using SOQL/DML query statements in trigger

SELECT field1 FROM sObject WHERE field = 'Myconst' LIMIT 50000; I need to replace this field = 'const' by storing this const in a variable which suppose is: String constVar = 'Myconst'; SELECT ...
2
votes
1answer
4k views

Using scope_identity() to get ID “during” insertion of row?

I have a column that has an ident_current constraint on it to populate another column, like so: alter table dbo.Employee add constraint dbo_Employee_D1 default ident_current('dbo.Employee') for ...
0
votes
0answers
101 views

Inner joins take too long

We have a query that takes about 8 minutes to execute if I want one day's scans, and we're going to need months'. It retrieves some columns which are used to determine to which bracket a scanned ...
0
votes
1answer
445 views

MongoDB: Manual failover and failback between two datacenters?

This is about MongoDB and datacenter failover and failback. We're thinking about using two datacenters and this MongoDB replica set: DC1-M1 prio 1, votes 1 (datacenter 1, member 1) DC1-M2 prio 1, ...
0
votes
1answer
39 views

Mongo DB - reading during update

Is it possible in a three-member-replica set (1 primary, 2 secondaries) to update records on the primary, or even delete several records and insert the updated data, and still execute read-ops on the ...
3
votes
2answers
3k views

PostgreSQL using count() to determine percentages (cast issues)

I'm trying to run the following query to provide the % of records in my patients table that have a value entered in the refinst field. I keep getting a result of 0. select (count (refinst) / (select ...
1
vote
1answer
160 views

Do not lock the whole table on select statement

I have a table that is constantly updated by some scripts. The scripts are adding new values and changing tuples but never deleting any tuple. I need to run some queries, that use all rows in the ...
1
vote
1answer
69 views

Equivalent SQL Server's Backup COPY ONLY in DB2

In, DB2 when you have a recovery strategie, you have a Full backup, then some deltas or incrementals in between. They are creating based on the previous full (first delta, or any incre. ...
2
votes
1answer
4k views

Using Oracle12C Client with Oracle11.g database

I have been using Oracle12c client to connect to an Oracle11g database in a remote server for about one month, it wasn't giving me any problems until this week, when I started getting the error: ...
1
vote
1answer
973 views

What is a good/healthy mysql query execution time?

What is a good/healthy mysql query execution time? To my calculations: The site gets 1000 unique visitors per hr 10 page view for each unique visitor 5 minutes for each unique visitor ...
0
votes
2answers
710 views

MySQL Community Edition Capacity

I am using MySQL Community Edition on Amazon RDS service. It is a very large database, 2/3 tables has about 10 millions records and 4-5 tables has 7-8 millions records. Questions How much capacity ...
5
votes
3answers
1k views

Virtual Log Files (VLFs) Fragmentation

I have a database with 160 VLFs. How do I determine whether the VLFs are fragmented? Further, how do I find the percentage of fragmentation? Another thing that I want to confirm: Are the following ...
6
votes
5answers
1k views

Performance tuning a Great Circle distance calculation

I have a query that I am using to find locations that are within 1km of a known point. To do this, I am using the Spherical Law of Cosines formula with my latitude and longitudes. Currently, the ...
0
votes
1answer
326 views

Transfer all read request to Slave in Master-Slave MySQL

I have configured master slave on my system (MYSQL). Now, is there is any script or way available or possible to transfer all read request to SLAVE. So, let me make my question here more clear. I ...
0
votes
3answers
186 views

MySQL: querying for latest messages in flat reply system

I've created a message system schema in MySQL as follows. It consists of two tables (messages, recipients). `Message_ID` int(11) NOT NULL AUTO_INCREMENT, `Message_Sender_ID` int(11) NOT NULL, ...
1
vote
1answer
920 views

ALTER TABLE AUTO_INCREMENT number in a Trigger

I want to have my auto increment column to increment by step of 3 upon insert. Can I do something like: Alter table `mytable` auto_increment = (select max(id) from mytable) + 3; in a Trigger? I ...
0
votes
1answer
44 views

What is the best solution to implement to replicate a database, with a purging process is in place

I am planning to implement a solution solution to create a separate database for reporting purposes (read only). I thought of implementing transactional replication to solve this problem, however I ...
2
votes
1answer
171 views

File database vs application server database for concurrent performance & bulk data

I asked a question about Ripple's database implementation, and received this response: The ripple server uses SQLite for structured data and a configurable "back end" for unstructured "bulk" ...
1
vote
2answers
150 views

[SOLVED]The right syntax for handling an UPDATE trigger and logging what happened per column?

SOLVED The users table: CREATE TABLE `users` ( `id` int(8) unsigned NOT NULL AUTO_INCREMENT, `email` varchar(45) DEFAULT NULL, `username` varchar(16) DEFAULT NULL, `salt` varchar(16) DEFAULT ...
1
vote
0answers
128 views

Can I add a primary key automatically for all tables?

I have a database (postgresql) with 10 schema and every schema has 10 tables. For some reasons, some tables do not have a primary key. Is it possible to create a function/trigger that can look for ...
0
votes
1answer
54 views

Using oracle easy connect does it really connect to the remote DB?

I tried connecting to remote host db using : sqlplus abc/abc@hostname1:1000/ABC And tried printing !hostname it still shows me local hostname from which I am running and not HOSTNAME1. So if ...
1
vote
1answer
127 views

Reviewing relational database tables

I am building a database, but I am a little bit confused with my table relationships. I wish someone could help review my table relationships below for me and tell me where I am going wrong. I have ...
0
votes
1answer
613 views

Return a default value in group by if selected column is null

I am trying to run a group by statement which works fine however, one of the "group" is null. How do I return "Unknown" for that row? For example: 10000 A 9999 B 9990 C 4 etc. First ...
0
votes
1answer
145 views

GROUP BY performance

I have a query like this: SELECT HOUR(datetime) as Hour, COUNT(*) as hits, SUM(clicks) FROM visitors_log_table WHERE datetime >= CURDATE() GROUP BY Hour WITH ROLLUP It works fine. But I ...
0
votes
1answer
74 views

PostgreSQL: How does the implicit index work when using “COPY” for loading bulk rows into a newly created table?

What I know for fast loading bulk rows into a new table is: Create the table(without creating the index) Use "COPY" to load data from a file into the table Create the index What if I added a ...
1
vote
1answer
2k views

SQLNET.ALLOWED_LOGON_VERSION=12 and JDBC thin client

To fix password security issues we need to set SQLNET.ALLOWED_LOGON_VERSION=12. According to the Oracle Database Net Services Reference: Note the following implications of setting the value to ...
0
votes
2answers
70 views

Help required to design a database [closed]

Firstly I would like to apologies if this is not the correct place to ask this question but I know how good community spirit is around here from my time in Stack Overflow. I am very new to the world ...
0
votes
2answers
7k views

Reclaiming data file free space after deleting a large amount of data

I am an accidental DBA. We have a sql cluster that hosts 10 databases. Suddenly the size of one of the database increased drastically from 100GB to 250GB. When we checked the datafile, the size had ...
3
votes
1answer
494 views

SQL Agent Permissions - Job Level

We currently have an SQL Job that runs an SSIS package. The output of the package is required for a report. As a result, the application that can create the report on demand first tries to run the ...
0
votes
0answers
124 views

Slow query (Wordpress)

Can I speed up somehow the following query? Somehow to stop from creating a tmp table/filesort. Tried a couple of indexes but no luck. mysql> explain SELECT wp_posts.ID FROM wp_posts LEFT JOIN ...
2
votes
0answers
45 views

Efficiently joining two irregular series representing changes

(This is a PostgreSQL-specific question, using version 9.1, but could be upgraded to 9.3.) I have a number of tables that represent a series of changes. These tables all have the same structure: ...
0
votes
1answer
271 views

How can I measure the number of IOPs for a certain query

I need to estimate the max IOPs for a certain MySQL DB (one that does not exist yet). The OS is Linux and the DB is MySQL 5.1.x (though I don't think the DB brand is important for the asked topic) ...
2
votes
1answer
129 views

Replicating a SQL Server database & Optimization

We got a database of approximately 100-120 GB on a server with 128GB ram, while the db is sitting on an 256 GB SSD drive. The bulk of the database space is spent on the tables below: Page_contents ...
0
votes
0answers
1k views

How to fix “Access denied for user 'root'@'localhost'” error for MySQL using Mac OS X?

After reading a few of the similar problems to mine and none of them working, I thought I'd attempt to be more specific to see if my root problem needed to be fixed differently than the others. I've ...
1
vote
0answers
110 views

Dealing with Multiple User Roles

I'm working on a project based on a CMS, where there is a built-in roles table. However, the CMS allows a user to have one role only using role_id And these are the requirements that struggling me: ...
0
votes
1answer
1k views

changed password for postgres login in pgAdmin, now can't connect to server

I was trying to use pg_dump to script out a database and in the process I used pgAdmin to change the password for the postgres user. I realize (now) that changing that password was a bad idea. But now ...
1
vote
1answer
301 views

ORA-02070: database does not support antijoin in this context

I don't think this is even a question, but in case someone has seen something like this before or has any thoughts besides 'file a bug with Oracle' (which I'm doing), I'd love to hear it. create ...
0
votes
1answer
1k views

Netezza LIKE operator not finding subsequent backslashes

Netezza is able to find records when using the LIKE operator when the first character contains a backslash character. But when subsequent characters contain a backslash character, it cannot. How can ...
2
votes
1answer
360 views

Complete Failover Cluster Failure SQL Server 2012

We have experienced a full cluster failure on our 3 node cluster running SQL Server 2008 R2 with 7 SQL Server instances. It started when we rebooted one of the nodes and it returned an error: Node ...
-1
votes
1answer
718 views

Oracle Partition Table Space Issue

I have a table with list partitions on it. When i insert data i see that all the partitions have default initial size of 8 MB and I also noticed that when i truncate full table and check size it still ...
1
vote
2answers
217 views

Relationship with a table without unique/primary key

I have a database with 3 tables. Table Work, with a field named workName. Table SubWorks, which have a field subWorkName and work with a relationship with Work.workName. And table Activity with ...
1
vote
3answers
1k views

Many one-to-many relationships between two tables

In the process of creating a small database for a therapeutic boarding school with Access 2013, I have a problem when designing the relational database model. Two times at least, I ran into a ...
0
votes
1answer
71 views

RAID drives or replicate data?

I have an old Microsoft SQL server that, for financial reasons, I cannot replace until later in the year. The OS, DB and temp files are on one 10k RAID 5 array (I didn't design it) The server is ...
1
vote
2answers
5k views

Adding Data to Multiple Tables Using Single Query [closed]

I want to add data to multiple tables using a single INSERT INTO query, can I do this? Please guide me and provide me syntax if this is possible.
1
vote
0answers
1k views

Error while Installing SQL Server 2012

I am facing the problem while installing SQL Server 2012 on my Lenovo ThinkPad. The same was working till now. However it seems, registry has been deleted. So I try to re-install same. But have no ...
0
votes
0answers
29 views

use domains in multiple schemas

The PostgreSQL CREATE DOMAIN command appears to create the domain at the schema level. Is there a best approach I should be aware of that would allow me to reuse domains across the multiple schemas ...
1
vote
2answers
165 views

Can I get some rationale from the Optimzer why it chose a certain explain plan?

This is not about reading an explain plan. This is not about adding any hints or measuring performance of a specific query. I have always been wondering whether it's possible for a given explain ...
4
votes
1answer
4k views

Set simple recovery mode and shrink log files for all user created databases

I hope you can point me in the right direction. I'm not a frequent user of T-SQL, but I did some googleing, and found the script below. I corrected the script a bit. I want the script to: To select ...
1
vote
0answers
89 views

Guidelines on best indexing strategy for varying searches on 20+ columns

I’m running a search engine for cars. It’s backed by a postgresql 9.3 installation. Now I’m unsure about the best approach/strategy on doing index optimization for the fronted search. The problem: ...
0
votes
0answers
94 views

Performance issue in Postgresql9.3

I have very good configuration server dedicated only for PostgresSql. Server is 16 Core 122 GB RAM on Linux machine. select version(); **PostgreSQL 9.3.4 on x86_64-unknown-linux-gnu, compiled by gcc ...

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