All Questions

1
vote
1answer
26 views

MySQL no query cache hits

My database have been up and running for a while with query cache enabled, but there are 0 hits. I have tried to check the settings but I am not sure what the problem is. Using InnoDB. mysql> SHOW ...
0
votes
0answers
7 views

How to handle filenotfound condition in java agent running and reading files 24*7 [migrated]

I am having application which runs 24*7 Its java standalone application. it reads log file line by line from configured location. When it doesn't find log file, then it just put exception statck ...
1
vote
0answers
30 views

Allowing users access to SQLPLUS and to compile PLSQL [duplicate]

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 ...
1
vote
3answers
10 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 ...
2
votes
0answers
20 views

Postgresql dynamic execute with arguments values in array

I'm wondering if this is possible in Postgres: Best explained using a contrived example: create or replace function test_function(filter_param1 varchar default null ...
1
vote
2answers
26 views

Schema/Structure to handle secondary computed data

I'm trying to design a LAMP-based website for my pinball league, which plays competitive pinball every week in match play. One of the features of our league is that we convert raw scores to ...
1
vote
0answers
17 views

How to replace empty, multi-column result with single 'none'

If it is possible to make query in Oracle which will return single column/row with value "none" instead of empty, multi-column result? Otherwise return proper amount of columns with result. This is ...
1
vote
0answers
14 views

Convert a list into one row with dynamic column in MySQL [duplicate]

I have a list of row to be converted into a dynamic column that depends on the record in one particular column. From this statement FID |Steps | Action ---- |------|-------- 1416 | 1 | Sit ...
1
vote
1answer
10 views

Replication on same physical server

I am new to DB. We have galera cluster on Test environment where mariaDB is replicated in 3 servers. Now customer want us to work with only 1 server. they cant provide 3. Can we do replication on ...
2
votes
0answers
29 views

ST_GeomFromGeoJSON() Causes postgres to crash

I'm running into a strange problem which I can't solve. The server crashes when executing some postgis related queries. After some debugging, using the examples provided by postgis, it appears the ...
3
votes
2answers
16 views

Do Postgres GIN indexes need to be rebuilt periodically?

Do they get bloated like btree indexes? If so how can the bloat be measured e.g. by an automated reindexing script. I am interested in improving query performance and saving space.
2
votes
0answers
18 views

Wich is the most efficient/easy way for end-user to get data from Analysis database?

I know that you can quey a cube by connecting from excel to Analysis database and using formulas like cubevalue() or cubemember(). I also know that after converting the power pivot to formulas you can ...
1
vote
2answers
15 views

Query to Secondary on Sharded Cluster

How to specify query from mongos shell which is inteded to query data from secondary? The goal is not to bother primary load on write and use data in secondary shards instead.
2
votes
1answer
29 views

SQL Statements truncated in log files

Does PostgreSQL cut statements if there is a subselect in it? We use log_min_duration_statement = 20ms to find statements which need a long time. But unfortunately the statements are truncated: ...
7
votes
2answers
266 views

How can I check for stored procedure consistency across multiples servers

I've got a stored procedure on 10 distinct servers, how can I check across all servers for stored procedure consistency? I'm currently pulling the definition for each server manually, and comparing ...
1
vote
1answer
17 views

Is there any way to use “like” operator during oracle table partitioning

I am using Oracle 11g database and I have 45 million records. I want to partition the table, but if it's possible for partitioning to support the like operator then it will be much helpful for me. In ...
1
vote
2answers
25 views

Outer Joins to find records with no matching associated entries

I'm trying to find all foo records which do not have any bar records that match a given criteria. create table foo ( id integer ); create table bar ( foo_id integer, name varchar(255) ); ...
0
votes
1answer
17 views

WordPress MySQL writes during “Flush Tables With Read Lock” are rejected instead of being queued

I'm running into an odd issue when setting MySQL into a brief read-only mode for backup. Reads continue fine during that "read only" minute, but writes are just rejected instead of being queued to ...
1
vote
0answers
16 views

Migration error: “Invalid date literal detected” when reading decimal

I'm attempting a migration from MSSQL to MySQL and keep coming across a "Invalid date literal detected" error when reading certain decimal columns. I'm running the following (all up-to-date as of ...
1
vote
1answer
16 views

How to design tables for airbnb style booking system

all. My English is not very good, but I will try to describe my question as clear as possible. I want to design a airbnb(https://www.airbnb.com) style booking system, this kind of booking system ...
1
vote
0answers
32 views

How to query sum all the wins of each team

Matches ID| radiant_name | dire_name | radiant_win 1 | LV | LGD | true 2 | LGD | LV | false 3 | LV | LGD | false 4 | LV | LGD | false ...
1
vote
0answers
7 views

phpmyadmin Password reset probleme

I restored my website from an internal automatic backup provided by the host in apache (Cpanel) server. Since i cant access my phpmyadmin and when i try to reset the password i get this error: ...
1
vote
1answer
37 views

Taking the difference in timestamps between successive entries

This is my first foray into DBA.stackexchange, so I'll say up front: this is a query optimization question. If this is not an appropriate question for DBA, let me know and I'll skulk away quietly... ...
1
vote
1answer
12 views

75% of RAM for Innodb_buffer_pool size

I have read many documentation including percona and MariaDB documentation where they recommend setting innodb_buffer_pool_size to 70-80% of RAM. My question is, is that total RAM or available RAM? ...
0
votes
2answers
57 views

How to update a column with values from the same newly inserted row on a SQL Server 2014 trigger?

Using SQL Server 2014, I have this: Table1 Tab1_id int identity(1,1) primary key Tab1_val1 smallint Tab1_val2 smallint Tab1_valInfo varchar(10) -- not yet implemented, will be used ...
2
votes
0answers
31 views
+50

Is this update, select combination query thread safe?

I have a table called seats, which has a schema like this id,taken For each user, I take a random untaken id and assign to that user, here for simplicity say, I make taken =1. The query I am ...
2
votes
3answers
55 views

Running two DELETE statements causes a syntax error

DELETE `member` FROM `member` WHERE `member`.`type_id` = 1; DELETE `subscriptions` FROM `subscriptions` WHERE `subscriptions`.`type_id` = 1; Table: subscriptions ...
2
votes
1answer
35 views

Marking duplicate records

I have a list of things, some of which are duplicates. create table things ( id int primary key, title text not null, author text not null, duplicate_of int null references things(id) ); ...
1
vote
0answers
27 views

SQL Server spending a lot of time creating sp_dbmmonitorupdate

I have an SQL Server 2008 R2 Standard with around 80 databases, 18 of which are a synchronous mirror primary. I'm having a lot of complaints about database speed lately, so I've started digging with ...
1
vote
0answers
6 views

SCD2 loading With Merge but without delete (multiple if matched)

Hoping someone can solve an issue for me. I'm very new to sql in general but with some research I've completed nearly 75% of the task. Basically, I need to compare an incoming file against my fact ...
3
votes
1answer
153 views

Why do nonclustered Indexes use clustered indexes instead of the table data pages directly?

From a Microsoft Course (presented by a third party) I learned that when a table has a clustered index even non-clustered indexes hit the clustered index. When there is not a clustered index (Heap) ...
1
vote
1answer
23 views

How to restrict access to current user record and its rights in postgres

Postgres 9 database contains additional information about postgres users: create table public.user ( user char(10) primary key, -- CURRENT_USER in postgres name char(30) ); and user roles; ...
0
votes
0answers
13 views

MySQL Remote Database Failover: Need Advice

I run a network of sites all on 1 server. To improve performance, I'm (finally) moving the MySQL database to a remote machine. I'd love anyone's advice on how to appropriately approach failover. ...
1
vote
0answers
16 views

How to UPDATE/DELETE/INSERT with Microsoft.ACE.OLEDB.12.0 as Linked Server in SQL Server 2012?

I need to update an Access 2003 database from SQL Server 2012 with the Microsoft.ACE.OLEDB.12.0 provider. As an administrator, everything works great. I can do Select, Insert, Update and Delete ...
1
vote
0answers
9 views

DB2 zOS increasing DSSIZE vs adding partition?

I'm trying to load data into a DB2 table. The tablespace has 3 partitions with about 60M,60M,70M rows. The 3rd partition is failing to load. It gives me a warning that loading this partition's dataset ...
0
votes
1answer
11 views

MongoDB Tag-Aware Sharding Workflow

I wonder the work flow of sharding cluster in Tag-Aware Sharding. --- Sharding Status --- sharding version: { "_id" : 1, "version" : 3, "minCompatibleVersion" : 3, "currentVersion" ...
0
votes
0answers
20 views

View Constraints in SSMS

I am new to working with SSMS. How do I view Constraints on a table. I tried right clicking on the table and selecting Design. Then clicking on Table Designer menu and Check Constraints. When I go ...
1
vote
2answers
75 views

Using sp_BlitzIndex - Diagnosed as “Index Hoarder: Addicted to nulls” [duplicate]

Context: MS SQL Server 2012 In using Kendra Little's awesome tool, sp_BlitzIndex, a number of tables were diagnosed as "Index Hoarder: Addicted to nulls". I'm not looking for a debate over NULLs and ...
1
vote
0answers
21 views

Migrate from SQLite to MySQL (then back)

For various reasons, I must use a SQLite database with a local application. However, I wrote a Flask app that enables users to more easily classify items in the database, and it runs very slow on ...
0
votes
0answers
22 views

MySQL 5.6.19a InnoDB Concurrent Insert

I've looked through most of the threads on this topic but still had question I was hoping someone would be gracious enough to help with. I am seeing low CPU usage and write latency but transaction ...
2
votes
1answer
26 views

How can one select a static value as a column based when using UNPIVOT?

I'm trying to unpivot a few columns in a table. This is for a reporting tool. The source data is already normalized. I am able to get my desired results with a series of UNION ALL statements. I can ...
0
votes
0answers
35 views

Availability Groups, Log File Backups and Recovering the Secondary

I am currently working on ironing out some kinks in a testing setup for our large (1.5TB+) database in an Availability group and have a few things I need some help with. Setup I have a two node ...
1
vote
0answers
21 views

Need advice on optimizing database on a recurring basis

I have a search engine with approx 3.5 million rows in the searchable table. There are many suppliers that feed into the table each day, so primary keys are constantly being removed and added and the ...
3
votes
2answers
409 views

Can anybody tell me what's wrong with this query?

CREATE PROCEDURE Click( in ipaddress varchar(45)) BEGIN DECLARE ex int; SELECT COUNT(*) INTO ex FROM clickactivity WHERE IP = ipaddress; IF ex = 0 THEN INSERT INTO clickactivity (IP, ...
0
votes
1answer
38 views

MySQL-How to find that value in a column is subset with all other values in same column multiple time

I have a table named as Team where table contain 3 column (ID,Team,Task). Its datatypes are (INT,VARCHAR(255),INT). Below you will find a sample table where I would like to perform the query on column ...
0
votes
0answers
19 views

Where's my missing Sql Server Express 2005 Database space? Size and space available dont add up to SQL express size 4G? [duplicate]

I recently deleted some data from a table that was not needed and growing to too big a size with this query which provided to me by a support tech... declare @mdate datetime set @mdate='04/04/2014' ...
1
vote
2answers
54 views

Create SQL Script Repository [on hold]

I need to get all my SQL scripts in some kind of script repository. I have searched the web but no luck so far. I thought of creating a repository in a SQL database, my problem so far is to properly ...
0
votes
1answer
40 views

Where's my missing Sql Server Express 2005 Database space? Size and space available dont add up to 4G?

I recently deleted some data from a table that was not needed and growing to too big a size with this query which provided to me by a support tech... declare @mdate datetime set ...
0
votes
1answer
20 views

What determines if a bytea has 1 or 4 extra bytes?

When inserting a BYTEA string in PostgreSQL the documentation says that such a string will occupy 1 or 4 bytes plus byte string length. The question that I can't seem to find the answer to is what ...
1
vote
1answer
30 views

How many rows will be locked by SELECT … ORDER BY xxx LIMIT 1 FOR UPDATE?

As was asked on stackoverflow but then for MySQL, I was wondering how this works in PostgreSQL. How many rows get locked when I do a "FOR UPDATE" in combination with a "LIMIT", a "ORDER BY" and some ...

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