0
votes
2answers
133 views

How can I in Oracle discover the average number of rows affected per transaction? [closed]

Our Oracle server is a big cluster of three very large individual instances. I want to try to understand the average number of rows per transaction. How can I go about doing this?
1
vote
0answers
197 views

Materialise row-number column

On Microsoft SQL Server 2012, I would like to materialise the result of the row_number function, because I hope it makes queries running faster. I considered to make a view index, or to add a ...
0
votes
1answer
71 views

Any recommendation on my.cnf on aws.large instance?

Any best recommendation variables for my.cnf on percona server on a high 256GB RAM and 32 CPU with 4000 IOPS? How about below ones? > innodb_buffer_pool_size=180G > ...
5
votes
1answer
2k views

Scaling PostgreSQL TRIGGER(s)

How Postgres triggers mechanism scales ? We have a large PostgreSQL installation and we are trying to implement an event based system using log tables and TRIGGER(s). Basically we would like to ...
0
votes
1answer
306 views

TokuDB + MariaDB 10: should I use a clustered index

I have a large table (200 Columns.. I know, but it wasn't my design) that will grow fast and I will have a lot of useless rows in it, identified by an IP (a varchar 32 column). The table will get ...
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 ...
2
votes
1answer
215 views

MongoDB - real disk usage is LOWER than dbStats.storageFile

I'm a bit surprised by what I observe in my mongo server, so I would like to know if anybody understand how this is possible. I have one collection of around 15K documents. For each of them, I store ...
0
votes
0answers
253 views

MySQL explain query: Using temporary table vs more rows examined

EDITED: Can you tell me which explain plan is better?! First: explain SELECT SQL_NO_CACHE count(*) FROM a force index(uni) WHERE a.date BETWEEN 20141001 AND 20141031 AND ((a.cid = 157 AND a.tid IN ( ...
3
votes
2answers
361 views

Is there a way to “SELECT and TRUNCATE” without losing new data?

I have an application that writes raw log files to a table called new in a PostgreSQL database -- lots of rows and lots of duplicate data. Via a cron job running every minute, I normalize the raw data ...
0
votes
0answers
75 views

Mongodb instances and oplog

I would like to ask a couple of things about mongodb and replica sets: I have different meteor applications running on my private server; each one of them uses a different meteor database (and does ...
0
votes
2answers
62 views

Count values of a column

I've got two database tables: Persons id user product 1 1 3 2 1 5 3 1 7 products id kilo 3 8 5 15 7 3 I'm wondering how to count values from a ...
1
vote
1answer
492 views

Why is there a difference in the character limit for VARCHAR2 in SQL and PL/SQL?

While working with some large scripts I encountered errors related with the 4000 character limit that VARCHAR2 has in SQL but not in PL/SQL. As explained here the VARCHAR2 datatype has a 4000 ...
2
votes
0answers
2k views

SQL Agent After installation not able to start

SQL Server 2012 SQL Agent will not start after installation. Checked permissions, on surface configurations, all OK, have tried to run it as another account no Joy. The error i am receiving is the ...
0
votes
1answer
1k views

How to create script file with PL/SQL?

I have to update several objects in many instances. In order to achieve that I am using DBMS_METADATA to create the DDL statements. So far I have the DDL statements and I save them in a TABLE. I ...
0
votes
1answer
3k views

Behaviour of RAISERROR within a TRY/CATCH within a loop

I have just encountered a section of SQL that is behaving not as I would expect (See below for a distilled version of the SQL in question that demonstrates the problem pattern). (This is on SQL ...
1
vote
0answers
134 views

Can MySql cause a Windows server to shutdown unexpectedly?

For the 3rd time, my server where my MySQL instance is running simply shutdown unexpectedly, this time, causing my tables to be corrupt as I had ALTER statements running. While in contact with my ...
1
vote
1answer
225 views

Correct way to uninstall SQL Server 2008 ( or above )

Since University I've been facing this problem... How do I uninstall SQL Server? What I've done is delete everything in "control panel" related to SQL Server. But, is there a right way to uninstall ...
6
votes
2answers
6k views

How do you find where a stored procedure is used (in other stored procedures)

I have a stored procedure which I want to refactor, in a database which has thousands of SPs. Is there a quick way of finding references to that stored procedure in other SPs so I can be sure that I'm ...
1
vote
1answer
76 views

MySql pivot table for scatter chart [closed]

I would like to transform the following sql (e.g. select Name,X,Y from mytable) result: Name | X | Y bla1 | 0.1 | 0.2 bla2 | 0.3 | 0.4 Into the following form that is displayed correctly in an ...
0
votes
0answers
29 views

Creating separate small table from big based on access frequency for “select” performance

I have table with several millions of rows which are selected a lot (many times in a second in average). It is indexed and everything is ok for now. But performance is always a question (sometimes ...
1
vote
1answer
160 views

Check for table lock in conditional statement [closed]

How can I make this work? IF( EXISTS (SHOW OPEN TABLES WHERE In_use < 2 and `Database` like 'MYDB' ) ) THEN -- DO SOMETHING END IF Context I want to run some sql statements inside a procedure, ...
0
votes
1answer
98 views

Order to restore system and user databases

We are going to move an sql instance to a new physical server (SQL SERVER 2008 r2). The answer to this question explains how Agent jobs and ssis-packages will be moved by restoring the master and msdb-...
7
votes
2answers
2k views

Finding the query causing the missing index DMVs

How can I find the query causing the missing index DMVs suggesting to create a particular index? Thank you.
1
vote
1answer
105 views

“No Loop” Constraint for hierarchical data in postgresql

I've got table like this in postgres: id primary key parent_id foreign key on id some data columns I need no a constrain which prevents cycles on the parent relations. There might be more tree in ...
0
votes
2answers
673 views

SQL Server Express to SQL Server Standard upgrade?

The database size on our SQL Server Express database is around 10GB. I checked our database size and it said 38GB. Do I need to upgrade to SQL Server Standard edition? Is it expensive to upgrade? ...
-4
votes
1answer
38 views

I cant connect to PosgreSQl throgh PG Admin

While i try to connect throgh PGAdmin this error message displayed " Error connecting to the server: FATAL: Peer authentication failed for user "postgres" "
0
votes
1answer
95 views

Rows to columns

I am new to Oracle. I know MySQL. I wrote below query in MySQL: Tables: CREATE TABLE Ass ( asset_id BIGINT(20) NOT NULL, caption VARCHAR(64) DEFAULT NULL, description VARCHAR(4000) DEFAULT ...
0
votes
0answers
160 views

Mongo Chunk 250000 document limit is creating problem in chunk migration

We can set chunk size limit for a DB. But chunk has a limit of 250000 documents per chunk. My chunk size is 250 MB which varies the number of document in each collections. So normally some of my ...
2
votes
2answers
2k views

Flush/Clean MySql ib_logfile0 ib_logfile1

Is there a way to flush ib_logfile0 and ib_logfile1 without dumping the tables to a .sql file, deleting, then re-inserting? Somebody entered a couple plain text credit card numbers into the customer ...
3
votes
2answers
970 views

Uniquifier on Non-Unique Clustered Index vs Unique Clustered Index

Lets say for example that I have a table structured this way: ID1 int ID2 int ID3 int DTM datetime I'm only able to create a unique clustered index on the table if I include ID1, ID2, and ID3 (a ...
3
votes
1answer
5k views

AlwaysOn Availability Groups go to Resolving status

We have a two-node cluster set up running SQL Server 2012 on Windows Server 2012 R2. The base cluster consists of only those two nodes. The quorum is set up as node + disk majority, with a shared ...
0
votes
1answer
138 views

How to become an administrator for SQL Server

Here is the situation: I Installed VS2013 That comes with SQL Server Express I am not able to create a DB from VS2013 thinking that it's because of user privilege issues, I Installed SQL Server ...
10
votes
2answers
927 views

SQL Server Index Update Deadlock

I have 2 queries which when run at the same time are causing a deadlock. Query 1 - update a column which is included in an index (index1): update table1 set column1 = value1 where id = @Id Takes X-...
2
votes
1answer
62 views

Slow query on mid-size tables with good index coverage

I'm running a query that touches 2 moderately sized tables (1-5 million rows). EXPLAIN shows it touches only indexes and very few rows, however it takes very long to complete (~8 seconds). The only ...
2
votes
1answer
628 views

Replication monitoring refresher for distribution job affecting performance

I have a performance problem due to a sql agent job executing dbo.sp_replmonitorrefreshjob. The environment is a 2 node Cluster with SQL Server 2005 SP2 and with transaction replication. The OS ...
1
vote
2answers
2k views

Load Balancer for MySQL MASTER MASTER Replication

We are having typical requirement. We are having MySQL MASTER-MASTER Replication setup in place. We require to setup Load Balancer between these 2 MySQL servers. I am aware of setting up WEB based ...
1
vote
1answer
98 views

dedicated SQL instance for SQL agent

Have an environment that has dozens of SQL instances all running SQL agent jobs for their own maintenance as well as other processes (etl, etc.) but considering a change to consolidate the non-...
1
vote
1answer
238 views

Full table scan - high water mark

When doing a full-table scan, why does Oracle scan all the rows beneath the high-water mark? Doesn't it know that some of the rows have been deleted and that they shouldn't be scanned?
0
votes
1answer
45 views

Will canceling InnoDB compression that's already in progress corrupt data?

I have a 155GB table that is in the process of being compressed. ALTER TABLE $table_name ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8; This compression has been running for a long time and is impeding my ...
2
votes
3answers
197 views

Transaction log reported full but is not

Batch jobs error emails report: The transaction log for database 'WebDB' is full. No, it isn't. Its 90% free. The transaction log backups run normally. My hardware guy tells me the hardware is ...
1
vote
0answers
243 views

Failed to notify 'DBA Team' via email

I setup a test job to test out my failure notifications and now I'm getting the following stating it did not notify my operator via email. The strange thing is I ran the same exact setup script on ...
2
votes
0answers
36 views

SQL Server transaction log reported full when it isn't [duplicate]

The transaction log for database 'WebDB' is full. No, it isn't. Its 90% free. The transaction log backups run normally. My hardware guy tells me the hardware is running perfectly, with plenty of ...
1
vote
0answers
299 views

SQL Server transaction replication agent error

We are running transaction replication on SQL Server 2008 R2 SP3. Distribution agents are reporting : "Agent is retrying after an error. 3 retries attempted" every 10 minutes. Tried changing ...
1
vote
0answers
418 views

Renaming a column with sp_rename hangs SQL Server 2012

I was attempting to remove a column from a table within SQL Server 2012 for one of our developers. As a precaution, before dropping the column, we rename them to make sure that everything continues ...
0
votes
0answers
76 views

Split and Concatenate data

I have a group of fixed width text files that come in daily. These files contain thousands of records each.Each record has an (01) as Header (02) as Detail 1 (03) as Detail 2 I would like to ...
0
votes
0answers
92 views

move mySQL 5.6/InnoDB tables to a different physical location

I was wondering if this is possible with mysql 5.6. I have a Database with several tables separated by Month (eg TonsOfRows_201411). I don't need access over the whole data so I decided to separate ...
0
votes
1answer
231 views

Restoring a database using Postgres data files instead of .sql files

I backed up my Ubuntu 14.04 system using rsync to a USB stick, but apparently it wasn't formatted for booting. The original disk has been erased and I put a fresh install of Ubuntu on it. In migrating ...
1
vote
0answers
39 views

Replication / Bulk Update between Servers

I'm looking to update several tables between two servers daily to have a replica of the data available. My question is, what is the least resource heavy and most effective method to implement this? ...
4
votes
1answer
853 views

Monitoring Amazon RDS with pgtop

I recently migrated a Postgres database to Amazon RDS and I am lacking a good live monitoring tool. I tried pgtop, but I can't get it to work on Amazon. I can see the header with the DB statistics (...
-6
votes
1answer
1k views

How do i convert bigint to int in postgreSQL [closed]

I wanted to find out negative values in one of the columns of type bigint. so when i do select *from tablename where columname(bigint) <0 ... its throwing me an error. SQL Error [42883]: ERROR: ...

15 30 50 per page