The discipline of Operational and Architectural Management of Database Systems.

learn more… | top users | synonyms

1
vote
1answer
4k views

DB2 Commands — Different ways of stopping database

I'm hoping to get a more in-depth explanation of the following DB2 commands, which all relate to stopping the database in some way, and how they differ from each other. How do DBAs think about these ...
0
votes
2answers
3k views

MySQL - HOWTO speed up slave replication on large database / Quickly spawn slave?

We have a large mysql database (about 100GB on disk) that we would like to spawn a slave for. Our typical process for creating a slave is: Create a slave server Load in a mysql dump of the master ...
0
votes
0answers
58 views

Help with Joins - Cartesian Product

I have 5 regions that each contain 1 store and 1 warehouse. I have a table that contains the regions and corresponding stores and warehouses. I also have a table that lists the inventories of both ...
0
votes
1answer
25 views

Is this normal binary logging behaviour - maintaining one ever growing file despite expire_logs_days?

I have a Percona MySQL DB running on a dedicated server. I have in my.cnf # REPLICATION # log_bin=/var/lib/mysql/binlogs/mysql-bin expire_logs_days=7 My issue is that the log file mysql-bin.000001 ...
1
vote
2answers
3k views

Stored proc getting ANSI_NULLS and ANSI_WARNINGS error when executed by application

I have a stored procedure that is getting the following error when executed via an application : Heterogeneous queries require the ANSI_NULLS and ANSI_WARNINGS options to be set for the connection....
7
votes
1answer
5k views

Why not rebuild indexes with page count <1000?

I use Ola Hallengrens script for Index maintenance. Before I did that, I used the following query to see which indexes are fragmented most: SELECT dbschemas.[name] as 'Schema', dbtables.[name] as '...
1
vote
3answers
210 views

Linux kernel parameters for oracle

I wonder what are the optimal Linux kernel parameters for oracle 11g db on 64-bit system. I didn't find any detailed, good or full recommendations or best practices for this issue. Just found one ...
0
votes
2answers
916 views

Check if database has changed to determine need to perform backup

I want to check SQL server database is modified or not. Reason to check database is modified is for backup(sql database backup) purpose. So I will be doing a full backup first and if any data inserted,...
2
votes
2answers
7k views

Create database fails with Microsoft SQL Server Error 5133, Operating syste, error 5 (Access is denied) [closed]

I just installed SQL server 2012 on Windows 2012 today. After the install, I changed the database settings to create database files in f:\mssql instead of the default. i verified the confired and ...
4
votes
1answer
232 views

Trace Flag 3688 not working on SQL Server 2014

We are using some third party tools that fill up the SQL Server logs with entries like: SQL Trace ID 1 was started by login "sa". SQL Trace ID 2 was started by login "XX\xxxxx". SQL Trace stopped. ...
2
votes
1answer
666 views

db2 performance issue - large number of IOPS how to determine problem?

DB2 database is on storage. We are using 9.7 Storage administrators reported that today database was doing 5000 IOPS (during past days average number was 300 IOPS). Those are disk operations from ...
0
votes
2answers
176 views

Minimizing database size (Many small tables)

Our database is interesting in that we have a large amount of tables that take up a correspondingly large amount of space, but when we do a MySQL dump of said database, it is surprisingly small. ...
0
votes
0answers
20 views

Usage of temporary tables in my tempdb database on sql server 2005 [duplicate]

I am trying to resolve the disk space issue on one of my drives where tempdb residing occupies more than 100 GB: Stats shown below I read some similar post on the same and i found few queries using ...
1
vote
1answer
702 views

Can we migrate oracle database 10gR2 to cross platform

I want to know can we migrate Linux based oracle database 10gR2 (10.2.0.1.0) to windows server 2003 with oracle database 10gR2 (10.2.0.3.0). I have seen the documentation related to database migration ...
3
votes
2answers
903 views

How to identify unused databases on my sql server

I am looking for the best practices or analysis someone would have followed to identify the unused or inactive databases on my SQL Server. I went through many articles, which say possibly to go for ...
1
vote
1answer
419 views

Cannot grant execute to stored procedure [closed]

When I try to GRANT EXECUTE ON SP_NAME TO [DOMAIN\USER_NAME] on my database, I'm getting the error message below: Msg 8115, Level 16, State 1, Procedure grant_safety, Line 5 Arithmetic overflow error ...
0
votes
1answer
52 views

I cannot do anything on replSet when auth is enabled

I have a mongodb cluster with one replSet, 3 config servers, and 2 mongos instances. I logged into mongos using (admin, pwd). admin is given ["userAdminAnyDatabase", "dbAdminAnyDatabase", "...
4
votes
4answers
6k views

What is the purpose of having a table NOT LOGGED INITIALLY

I came across this recently. When defining a table in DB2 LUW (at least 9.5 or higher), you can define it as NOT LOGGED INITIALLY. Example from the book I read: CREATE TABLE products ( productID ...
1
vote
2answers
2k views

How to identify the db orphan mdf and ldf files

I want to identify the orphan mdf and ldf files on the disk and remove them. After searching on the internet, found the script below on MSDN forum. But when I run the script it returns many system-...
1
vote
0answers
262 views

File group space problem

I'm having some problems with my database usage space. I have a database with autogrowth off and limited size to 150GB. When users try to import files, large databases or other massive transaction ...
1
vote
2answers
3k views

Unable to change engine to MyISAM in MySQL

I have installed MySQL 5.6.10 on Mac OS X 10.6.5. My issue is that MySQL is using InnoDB as its default engine. I have checked following engines are supported in MySQL: show engines\G ************...
12
votes
1answer
5k views

How to determine if there are [idle connections with] uncommitted transactions in PostgreSQL?

According to a comment on this question I asked about idle connections in PostgreSQL 9.2, some uncommitted transactions (possibly related to some of those idle connections) might cause some ...
1
vote
0answers
25 views

CHKDB is marked RESTORING

I am seeing this in my Microsoft SQL Server 2008 R2 (SP1) database log: The database 'CHKDB_dbname' is marked RESTORING and is in a state that does not allow recovery to be run. This occurred ...
0
votes
0answers
246 views

mysqldbcompare showing AUTO_INCREMENT differences but there are no missing records

I am encountering a strange issue when using mysqldbcompare to compare two MySQL DBs(one is a master, the other its slave). I noticed that the tool notes that the AUTO_INCREMENT values of this ...
0
votes
1answer
134 views

How database buffer pool work?

For example we have 2 scenarios: Scenario 1:- We have very small buffer pool size of 100MB. My query data is 500MB. Does the system keep 500MB query data in RAM such that a new ...
4
votes
3answers
5k views

How can I dynamically back up all SSAS databases on a given instance?

I want to dynamically back up all the databases on a given SSAS instance using a SQL Agent job (which would most likely involve executing an SSIS package). It is imperative that this is a dynamic ...
3
votes
5answers
8k views

How to delete the remote files older than N days on schedule from SQL Server 2012 (with SqlServerAgent job)?

Struggling to execute PowerShell commands in SqlServer Agent job of MS SQL Server 2012 R2 (Windows Server 2008R2, Windows 7 Prof) I need to delete (.bak files older, than, say, 7 days in remote ...
0
votes
3answers
171 views

Allowing users to compile / run PLSQL and SQL

As a DBA - assuming my users are knowledgeable with PLSQL and SQL - why would I not grant my users privileges to compile and run their own PLSQL code. We have an MI database environment where the data ...
0
votes
1answer
104 views

MySQL Performances Issues

I'm in debate with my database admin. He claims that my queries I'm sending through PHP are the problem and he is stating several things I believe are completely false. To begin I have a site ...
0
votes
3answers
147 views

Database Design for Paper Submission System

I am learner of Database design, I want to design a database for a journal paper submission system in which one paper can be submitted by one or more author. I have initially two tables Author and ...
0
votes
1answer
240 views

Data distribution in mongos with shards or replica sets

I am a newbie to mongodb.I have set an mongodb architecture with a single mongo shard(mongos) connected to three shards(replica sets) with three config servers. The architecture looks as below: Now ...
1
vote
0answers
832 views

How to enable implicit casts in PostgreSQL >=9.2?

Coming from this topic on SO a user suggest me to enable implicit casts in my PostgreSQL and I don't know how to do that. I also don't know if this is a good practice or if it's the solution to the ...
1
vote
0answers
133 views

Where to put standby control file in Physical standby database?

I am creating a physical standby database for which I am creating a standby control file using command = ALTER DATABASE CREATE STANDBY CONTROLFILE AS '/oracle/dbs/stbycf.ctl'; but It creates only one ...
0
votes
1answer
63 views

How can I quantify the business value of normalization?

My company is developing an internal application with a SQL server database which was started earlier by another developer. Now I am Looking at the model,the developer has stopped at 1NF. I proposed ...
0
votes
1answer
125 views

Indicators for right balance of the number of DB2 instances per AIX LPAR

I have a question that has been bugging me, but I just don't know how to validate it. We run DB2 LUW on AIX in our shop. Our AIX is currently at 7.1. Our DB2 is at 9.7 FP 4 for most installations and ...
1
vote
1answer
182 views

Exadata RMAN vs. Non-Exadata RMAN - any differences?

Can you please let me know the differences, if any, in the architecture of the non-Exadata RMAN vs. that of the Exadata-RMAN from an SBT plugin perspective? Have you observed from your vast ...
0
votes
2answers
238 views

Restore Database with Multiple Restore commands

For automation, I have to dynamically construct the restore commands and thus I have created a script. A .bak file is created on a remote server and I receive it daily. The script builds the restore ...
3
votes
2answers
393 views

Stored procedure takes 18 seconds on first load, 0 seconds on subsequent loads, waiting several minutes makes it slow again

I have a stored procedure that returns a lot of data for a business dashboard. On first load it takes 18 seconds, after that it takes 0 seconds, even if I change the input parameters at random it ...
0
votes
2answers
687 views

Is there data visualisation tool for postgresql which is capable of displaying inter schema relations as well?

Operating system used is linux. I have tried Navicat and SQL Power Architect. They did display relations between tables in the same schema. I have some foreign key constraints which reference tables ...
-2
votes
1answer
43 views

opening_database

When I try to create user in the sqlplus, it raises an error at line 1 ORA-01219: database not open: queries allowed on fixed tables/views only. How to correct this error? Please help me out.
1
vote
0answers
85 views

mirroring on sql server 2012 on different windows server 2012

I have 2 servers *.203 and *.205 I have sql server 2012 on each of them I tried to make mirroring between them every thing goes successfuly but when I tried to start mirroring it gives me ...
0
votes
0answers
105 views

Differing AUTO_INCREMENT values between 5.1 vs 5.6 slaves

I have a MySQL 5.6.21 slave and a MySQL 5.1.73 slave that are both replicating from the same MySQL 5.1.73 master. I noticed that for several of the tables ( I said several because when I try to rerun ...
4
votes
1answer
2k views

Does `Seconds_Behind_Master` show exact Slave Lag from Master?

Does Seconds_Behind_Master always show the correct number of seconds the slave is behind the master? I have also Implemented the mk-heartbeat replication monitoring. It was showing the other result ...
0
votes
0answers
101 views

Last synchronization time between master and slave (replication)

During replication process where a Master is connected with slave. Some times connection between these two goes down. Any options to get the details of the last synchronization time?
1
vote
1answer
94 views

many Servers of SQL server 2012 needs mirroring

I have two SQL server 2012 instances and I want to configure mirroring between the 2 servers with database. My questions are: How can it automatically change host of one if the other one was dropped ...
3
votes
2answers
178 views

Inconsistent information from different DMVs

I've a server with 12 GB of physical RAM. I just lowered its 'Max Server Memory (MB)' setting from 10 GB to 8 GB. If I look at the processes' committed memory in Perfmon, I see: select * from sys....
2
votes
3answers
1k views

How to enable windows authentication on server that is not part of domain

We have an SQL server instance running on a standalone server (not part of the organizations domain network). Is there any way that we can use windows authentication to logon to sql server without ...
1
vote
1answer
117 views

Immigrate to file-per-table mode in MySQL

I have 20 MySQL databases and in each there are about 20 tables. All the data is saved in a file called ibData1. Now I discovered about the file per table mode but if I change the value in the my.ini ...
1
vote
2answers
15k views

ORA-01033 “ORACLE initialization or shutdown in progress” caused by ORA-10567 “REDO is inconsistent with data block”

I faced an error while logging to database with regular user (non SYS/DBA): C:\Users\user>sqlplus tester@orcl ORA-01033 ORACLE initialization or shutdown in progress However I can connect via ...
0
votes
1answer
971 views

Best Innodb Buffer Pool Size for 8GB RAM?

I found out that my MySQL server is configured with only 128MB for innodb_buffer_pool_size. That is not enough considering that I have a 8GB RAM server. It hosts MySQL server and an Apache/Catalina ...