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10
votes
3answers
24k views

How to use insert delay with the InnoDB engine and use less connection for insert statements?

I'm working on an application which involves a lot of database writes, approximately ~70% inserts and 30% reads. This ratio would also include updates which I consider to be one read and one write. ...
1
vote
1answer
4k views

Decode query truncates a date

I am not sure if I am looking at this problem the right way: I have a query like this on an Oracle database SELECT DECODE( TO_CHAR(MIN(DATE), 'YYYYMMDD') , '' , NULL ...
28
votes
4answers
3k views

Can spatial index help a “range - order by - limit” query

Asking this question, specifically for Postgres, as it has good supoort for R-tree/spatial indexes. We have the following table with a tree structure (Nested Set model) of words and their frequencies:...
0
votes
1answer
861 views

How to troubleshoot/debug Oracle permission problems

An application is connecting to Oracle to do stuff. It's not working but I don't get any ORA errors in the application itself. I'm thinking its a permission problem. So my question is what is the best ...
1
vote
1answer
85 views

Oracle DB administrator-specific security features

Yesterday I was presenting an internet banking solution to a potential client management. My offer is based on using MS SQL Server 2008 RDBMS. One of the client's officers mentioned, that Oracle's ...
9
votes
1answer
499 views

SQL substitution feature in Oracle 10g

Three or four years ago I read in an Oracle blog somewhere that a DBA had used for an emergency incident resolution an Oracle 10g feature of real time SQL substitution. Basically, he configured Oracle ...
2
votes
2answers
2k views

Trouble with Alerts and Notifications on SQL Server 2000

I'm trying to set up alerts and notifications in SQL Server 2000, but they are not working. I'm testing them for Agent scheduled jobs, and I get a note saying: NOTE: Failed to notify '[...
0
votes
3answers
220 views

Dog slow query, needs optimizing, please help

I found this query in our web app that has been made by hired programmers. It performs like a dog and needs optimization, but I'm no MySQL wizard (yet), unfortunately. Please help, anything is ...
7
votes
1answer
416 views

Performance of query with a range condition and order by

We have the following table (in SQLite on Android) which a tree structure (Nested Set model) of words and their frequencies: lexikon ------- _id integer PRIMARY KEY word text frequency integer ...
3
votes
1answer
424 views

PostgreSQL memory spike upgrade from 8.2 to 9.1

We recently upgraded a few of our development computers from PostgreSQL 8.2 to 9.1, with plans on eventually upgrading our production servers. Everything seems well with the restore of the databases, ...
3
votes
2answers
1k views

can I convert an integer to base-2 without a function

Here's a bit of a challenge. I am working with the table ReportServer.Schedule and there is a column called DaysOfWeek. I may not be using the proper terminology here, but this is an integer from ...
2
votes
1answer
1k views

How to store GPS coordinate and search places in a radius from a NoSQL DBMS (like DynamoDB) [closed]

My team need a DBMS like DynamoDB to store large amount of data, principally places and coordinates. I've considered to use some GIS-based DBMS (like PostGIS) with an index on the POINT, but DynamoDB ...
0
votes
1answer
15k views

Returning Row Count in a Stored Procedure in Oracle

I'm mostly SQL Server person, so forgive me if this is too close to SQL Server, but in a nutshell using Oracle 10 I'm trying to build a procedure something like this: PROCEDURE SP_INFO_EX_S( ...
6
votes
1answer
275 views

Is it recommended to clear the query plan cache

Pretty much as the title describes. I have just checked a SQL Server and noticed there is a lot of query plan bloat that can be fixed by proper parametrisation. After making the changes to the code, ...
3
votes
2answers
2k views

php/mysql database redesign and migration: changing databases to tables

I wrongly designed my application to have one database to each user. each user had 3 similar tables. I now want to have one database and 3 tables only; where i will use the database name in the old ...
12
votes
1answer
12k views

Named Parameters in MySQL Workbench Queries?

In OpenOffice / LibreOffice I'm used to added :prefixed-parameter-names to my queries. For example: SELECT name FROM table1 WHERE id = :id Is there a similar functionality in MySQL Workbench?
-3
votes
3answers
663 views

Which tools can be used to clean CSV files prior to bulk insert? [closed]

Which tools and programming libraries are you aware of that can help accelerate CSV manual correction process when column separator characters are encountered within data elements? I'm currently not ...
1
vote
1answer
2k views

Failure to detach database

I used sp_detach_db to detach SQL Server 2005 databases. This works properly in Windows XP and Windows 7. However, the same fails in Windows Server 2008. The error message states: The process ...
5
votes
1answer
1k views

MySQL Server Backup

I was wondering if there was any way of making a backup of an entire MySQL Server at regular intervals to a specific location. (If the version is required I can get it easily). If there is, I must ...
3
votes
1answer
133 views

Complex MySQL Query returning almost all the correct rows

I've created a SQLFiddle with my schema and some test data. The calculated columns aren't working for some reason in SQLFiddle, but they come out fine in my MYSQL Workbench. Assume they work correctly....
2
votes
2answers
27k views

Return many rows on a plsql Oracle10g

I'm doing a little project and I need to do a plsql to return many rows. I have someting like: Table(id, data1, data2, from) And the user gives me the value of from and I have to return all that. ...
2
votes
1answer
282 views

Changing to InnoDB increases iostat

I have changed my MyISAM tables to InnoDB and from that day, iostat is increasing continuously. My findings on the server say that mysqld is the one who is increasing iostat. But how can it increase ...
0
votes
1answer
52 views

All manual settings get wiped out when saved in My.cnf, why? [closed]

When I open my.cnf to enter manual setting like: innodb_buffer_pool_size = 50M innodb_log_file_size = 15M bulk_insert_buffer_size=25M log-slow-queries = mysql-inja-slow.log All of my settings get ...
5
votes
1answer
752 views

Upgrade Postgres without doing a pg_dumpall

I'm upgrading from postgres 8.4 to 9.0 and looking at the manual it looks like this is my only choice: pg_dumpall -p 5432 | psql -d postgres -p 6543 Which means I'll need to stop any writes to the ...
2
votes
1answer
7k views

Default values in SQLite3

When I created the table structure of my SQLite database, I provided a DEFAULT value which is used when no value is provided by the user. Now, because the application code changed, I need to modify ...
1
vote
5answers
5k views

How should I save apache logs into a mysql table?

This is a php script to view apache logs. I want to save apache logs into a mysql database. Then add some rules for tagging urls using mysql REGEXP search, like: SET tag='some tag' WHERE url REGEXP '...
12
votes
2answers
81k views

Using Same CASE WHEN Conditions For Multiple Query Columns

Is there a "better" way to rewrite a SELECT clause where multiple columns use the same CASE WHEN conditions so that the conditions are only checked once? See the example below. SELECT CASE ...
4
votes
2answers
5k views

Replace cursor with set-based approach

I am looking to replace my cursor-based solution if possible in a particular stored procedure. If it makes any difference, this is running on SQL Server 2008 R2. I am looking more for an algorithm ...
9
votes
1answer
371 views

Variable for element name

I have this tSQL code which works OK: SELECT c.logguid, a.b.value('./PropertyValue', 'varchar(max)') asd FROM [dnn].[dbo].[EventLog2] c cross apply sss.nodes('/LogProperties/LogProperty[...
1
vote
1answer
271 views

ssis delete database on error

I'm writing an ssis package that imports a number of access databases nightly. Each database has the potential to have a slightly different schema. Since I'm creating the tables than doing a direct ...
2
votes
2answers
5k views

Connection to localhost dramatically slower than to network server

I have an Excel VBA application that connects to a SQL Server 2008 R2 database through ADODB. When I'm on the network at work, the connection is almost instantaneous. When I am at home working with ...
5
votes
1answer
3k views

Export multiple tables among servers

We currently have an SSIS package that exports about 70 large tables nightly, with truncate and load at the destination. Our tables keep changing, we sometimes add some tables and remove some and ...
1
vote
1answer
648 views

Need help optimizing mysql on a busy server

I am managing a server for a very busy news website with lots of select queries (read-heavy), concurrent about 4000 users online at peak time. Around 1.4Mil pages views / day The server has 42G RAM, ...
6
votes
1answer
2k views

Transaction log growing on a mirrored principal

I have a pair of SQL Server 2008 R2 servers hosting a synchronously mirrored database with no witness. This weekend, we had to do some network maintenance so I paused the mirroring. Upon resuming, the ...
3
votes
2answers
210 views

How can I mimic functionality of SQL Server `TYPE` in Oracle?

I apologize if question title is vague, but I was not able to formulate it better. What I'd like to have is an alternative to TSQL CREATE TYPE, so I can use it in column definition. For instance, I ...
3
votes
2answers
207 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....
4
votes
1answer
12k views

Full and differential restore with two backup files - SQL Server 2008

We are trying to establish a maintenance plan with 2 separate backups. One full backup over the weekend and differential backups through the week. [the differential backup has a "_diff" appended to ...
7
votes
1answer
5k views

How large will a MySQL database be relative to the dump file?

I'm restoring a ~52GB dump to a MySQL database. The ibdata1 file has already exceeded the size of the dump file and the restore is still incomplete. Is there any way to estimate the final size of the ...
1
vote
2answers
2k views

Better diagnostics when starting ndb nodes?

I have an ubuntu linux server that uses mysql cluster 7.2.5 x64. Whenever I start an ndb node and check with ndb_mgm -e show, it stays in "starting" state for a long time. When I use top to check the ...
13
votes
5answers
108k views

Update existing rows with squence number/char or any unique data

I added a new column in the Table X This column "cn" has to be unique and mandatory, but old data don't have any value. How to update the existing records with sequecely or random unique data? ...
1
vote
1answer
896 views

Restore the data from Snapshot Backup when the data spans over multiple directories?

Problem : I have one master and various slave on EC2, all running with the innodb_file_per_table as OFF. We have done some testing work on one of the slave say server A.and it takes a huge amount of ...
0
votes
1answer
1k views

Centos 6.2 mysql configuration file help

I have a new centos 6.2 setup. Below is the configuration file. The machine is going to be fully innodb and it had 8Gb ram. What else must I include in the .cnf? [mysqld] datadir=/var/lib/mysql ...
8
votes
3answers
2k views

Creating an index in both asc and desc directions

Over the past few weeks I've been raging against an old Firebird database. This database is crappy for all sorts of reasons, but one thing I noticed was that every single field of every single table ...
3
votes
1answer
2k views

MySQL - Installing InnoDB Plugin

I have a Master/Slave Replication Setup, both servers run MySQL 5.1.61. I want to upgrade the master server to a stronger machine with the following: 2 processors - 6 cores each 48GB of RAM To ...
2
votes
1answer
4k views

Can RMAN duplicate be used to “replace” an existing database?

I have an unused database B, not valuable. I'd like to make a copy of database A, but do not want to go through all the manual steps RMAN requires to set up the auxiliary database. Can I use RMAN ...
2
votes
2answers
3k views

Rule of thumb: AUTOALLOCATE or UNIFORM size for tablespaces

Is there a rule of thumb for creating a tablespace with extent management AUTOALLOCATE or UNIFORM? If the latter applies, how to estimate a reasonable extent size? Even more, what should apply for ...
4
votes
1answer
3k views

Where do I find the meaning of TdsInputBufferError numbers?

We are having some sporadic connection errors on some of our SQL servers. I did some searching and found out about the Ring Buffer in SQL 2008 R2 and found some information, but I am not entirely sure ...
0
votes
1answer
7k views

Slave start to generate relay log files but not master server

I am settings up two new servers. One is the master and the other is the slave. Below is the config file for both. Master DB [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=...
0
votes
1answer
85 views

Second instance of query designer for a single table in SSMS (Express)?

Forgive me if this is the wrong exchange site for this question. It seems like the right one. I have been a fan of writing queries manually for a long time, but recently I've got into the habit of ...
2
votes
1answer
109 views

Updating SQL Server 2008 R2 using slipstreamed source

I have a requirement to create a SQL Server 2008 R2 SP1 setup media. I have done this using slipstream method as recommended by Microsoft. I can only use this to create new installation. But is there ...

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