Database Design-room Availability
Jan 24, 2008
Hi,
I am developing a .Net application for a Guest house for my final year project. I'm using C# and SQL Server. I want a way to look up if a room is available or not on a particular date.
First I came up with...
Room: Room_id(PK), Room_type, Room_rate_pp, Room_availability
but how can I distinguish whether a room is available on a particular date? I think Room_availability is useless in this table because it can't do this. Do I need some sort of calendar table or something?
Your help with this would be greatly appreciated. it's annoying me so much, and I can't move on with the project until I have my database finalised :eek:
Thanks,
Sean
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Nov 23, 2005
My problem is trying to calcuate whether a room is booked during a dateperiod.I have a table with two columns (Start and End date).I need some SQL code to calculate whether a room is booked during a daterange.e.g.The booking entry is:Start21/11/2005End25/11/2005Any help on this would be appreciated.The End Date indicates the last night of the stay.Regards,Steven*** Sent via Developersdex http://www.developersdex.com ***
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May 13, 2015
I have a scenario like below
Product1
Product2 Product3
Product4 Product5
Product1 1
1 0 0
1
Product2 1
1 0 0
1
Product3 0
0 1 1
0
Product4 0
0 1 1
0
Product5 1
1 0 0
1
How to design tables in SQL Server for the above.
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Aug 22, 2005
i need a script that:
select all records from a room, if the records in that room have a recordcount less then 100 records continue with next room until
we have 100 records, the next time i run this script, i must give me other rooms (random)
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May 16, 2000
I am trying to reindex a large table, and cannot because there isn't enough room on the the primary filegroup. the database consistes of one physical file in the primary filegroup. the table is over 50% of the size of the database. When the table is less than 50% of the size of the database, I do not see this problem.
BTW, the only index on the table is the primary key which consists of two columns, one is an integer and the other datetime.
It seems as if SQL server needs 1x the current size of the table to be free in order to reindex? Is this the case?
It is not an option for me to allow the database to autogrow. Is there anything else I can do?
Thanks for your help!
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Feb 7, 2006
I downloaded the 800 mb file (32bit) on my XP (SP2) box and it comes up with a message that I do not have enough disk space on c: drive. Well I have 180GB of space, so that cant be it. Is it because it requires an NTSF drive ad not a FAT32 drive?
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Oct 24, 2007
I have a large db that goes through regular maintenance
every week. The problem seems to be that while the db is re-indexing some of my
key tables I get time out errors. Are there any suggestions on how I can combat
this problem. Management has tasked me
with having 24 hour access to the db because if people aren’t completing there
transactions we don’t get paid. I have
also noticed the timeout issue when we are running in files that create new
records. Is this a basic problem with
the way the db is structured? Are they
any tools that I can use to change our process so that we can maintain the 24
hour access to the db. How are other
companies maintaining 24 hour access to there db?
Thanks in advance.
Don
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Sep 20, 2005
Hi my data files sit in the default directories and I think they are causing my partition to run out of space. I mainly use one db that I created but don't use the others (ie master, model, tempdb, etc). Yet I see their MDF and LDF files are growing. What can I do to shrink them down or perhaps move them off to a larger partition after shrinking?
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Nov 30, 2006
this is what i am looking for,
A client with an email address that does not end in uk cannot make a room booking
Any ideas
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Jun 3, 2008
i want to check the new username check availability from database in a same page ,i did in normal coding
i need ajax or java scripts method because this page look and feel is not good
thanks,
@mbi
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Nov 4, 2003
Are there any other products out there to monitor database availability
in SQL server 2000 beside Tivoli by IBM?
Thanks;
Lava
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Jun 30, 2014
I been trying to learn availability groups since I have not implemented it.
From my understanding you can have more than one group.
Lets pretend we have two groups in one instance:
1. Accounting
2. Engineering
From my understanding you can't make a database in two AG because it wouldn't make sense.
But lets pretending there is one database that both are used by accounting and engineering.
Would you have to make a third AG for future fail overs so that other databases in the other two group don't failover when not needed because when you fail over an AG all the databases inside it fail over.
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May 23, 2008
Hello
I'm working on an application which is mainly used to look up compressors and their data which are held in documents.
This is a simplified representation of the tables of importance:
Document
--------
Id (int, identity) (PK)
Number (nvarchar(50))
Compressor
----------
DocumentId (int) (PK, FK)
Id (int, identity) (PK)
Name (nvarchar(50))
CompressorData
--------------
CompressorId (int) (PK, FK))
Id (int, identity) (PK)
Value (nvarchar(50))
The tables are linked as follows:
Document -> Compressor -> CompressorData
Non clustered indexes are created on Document.Number and Compresor.Name because these fields are used for querying.
At certain points corrections will be released on compressors which
will result in:
- Creating new documents with new document numbers (note that a non clusterd index exists on Document.Number).
- Copying affected compressors of existing documents into the new documents (note that a non clusterd index exists on Compressor.Name).
- Copying the data of the affected compressors into the new documents.
This can result in creating ten's of new documents and copying hundreds compressors and thousands compressor data records.
My question:
Will the users still be able to query for compressors while corrections are released (thinking about indexes which need to be modified) or will their be so many locks held that the database becomes unusable?
Thanks in advance,
Alain
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Nov 9, 2015
SQL 2012 EnterprisePrimary server and 2 x secondary serversWindows 2012 R2
I have removed one of the database from availability group by mistake. Luckily I am still operational with primary server. database on secondary servers are on restoring mode.
I have done full backup of database from primary (prod) server and restored on secondary servers with no recovery when I add database into availability group I get an error message log missing what is the best method to achieve and add database again into availability group.
Note I cannot restore database on primary server as it is on production
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Oct 30, 2006
Hello,
I would like implementing a database mirroring architecture with SQL server 2005 but i have questions.
If i don't use a cluster architecture, i would like knowing if there's any solution to move the alias SQL server from the primary to the secondary by script.
Anyone got a pb like me? or any solution?...
Thanks for your help...
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Jul 29, 2014
I've got an availability group with multiple databases, replicating to multiple secondary servers. On one of the secondary servers, some of the databases are not synchronising, and when we try re-establish the sync we get an LSN error. I can't see any obvious way to re-establish only one database on one secondary without affecting all databases on that secondary or affecting that database on all secondary nodes.
The options I seem to have are to either remove the database and then re-add it, in which case this affects all secondary replicas, or to remove the secondary replica and add it, in which case all the DBs are added.
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Jun 26, 2015
We are planning to upgrade our production servers from mirroring to alwayson. Our current mirror setup gives the advantage that it can failover a single database.To have a similar setup in alwayson we are probably going to create an availability group per database. Any other disadvantage in this except for the extra initial configuration work?
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May 26, 2008
Hello
I'm working on an application which is mainly used to look up compressors and their data which are held in documents.
This is a simplified representation of the tables of importance:
Document
--------
Id (int, identity) (PK)
Number (nvarchar(50))
Compressor
----------
DocumentId (int) (PK, FK)
Id (int, identity) (PK)
Name (nvarchar(50))
CompressorData
--------------
CompressorId (int) (PK, FK))
Id (int, identity) (PK)
Value (nvarchar(50))
The tables are linked as follows:
Document -> Compressor -> CompressorData
Non clustered indexes are created on Document.Number and Compresor.Name because these fields are used for querying.
At certain points corrections will be released on compressors which
will result in:
- Creating new documents with new document numbers (note that a non clusterd index exists on Document.Number).
- Copying affected compressors of existing documents into the new documents (note that a non clusterd index exists on Compressor.Name).
- Copying the data of the affected compressors into the new documents.
This can result in creating ten's of new documents and copying hundreds compressors and thousands compressor data records.
My question:
Will the users still be able to query for compressors while corrections are released (thinking about indexes which need to be modified) or will their be so many locks held that the database becomes unusable?
Thanks in advance,
Alain
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Feb 13, 2002
Ok, I'm doing a football database for fixtures and stuff. The problem I am having is that in a fixture, there is both a home, and an away team. The tables as a result are something like this:
-------
Fixture
-------
fix_id
fix_date
fix_played
----
Team
----
tem_id
tem_name
-----------
TeamFixture
-----------
fix_id
tem_id
homeorawayteam
goals
It's not exactly like that, but you get the point. The question is, can I do a fixture query which results in one record per fixture, showing both teams details. The first in a hometeam field and the second in an away team field.
Fixture contains the details about the fixture like date and fixture id and has it been played
Team contains team info like team id, name, associated graphic
TeamFixture is the table which links the fixture to it's home and away team.
TeamFixture exists to prevent a many to many type relationship.
Make sense? Sorry if this turns out to be really easy, just can't get my head around it at the mo!
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May 15, 2015
one of my database is configured in availability group , I need to add another datafile to that database , how can I do this?
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Sep 17, 2015
I need to move files for a lot of databases that are all part of an AG. I've used the method at the bottom of this link with success on a small test DB.
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May 19, 2015
Discovered that a geo-spatial AlwaysOn HA database (1 of 4) was not synchronizing as at a point in time earlier in the day. Suspend Data Movement appears to be working perpetually without finishing. The SQL Server services is in a Pending Changes state after an attempt to restart it from SQL Configuration Manager. The Cluster Dashboard says it is in a Not Synchronizing state, with only the one database in question having a yellow triangle, all 3 others show green.
The warning for the cluster is:At least one availability database on this availability replica has an unhealthy data synchronization state. If this is an asynchronous-commit availability replica, all availability databases should be in the SYNCHRONIZING state. If this is a synchronous-commit availability replica, all availability databases should be in the SYNCHRONIZED state. There is no abnormal data movement from the primary to the seconday.The warnings for the unhealthy database are:
The data synchronization state of this availability database is unhealthy. On an asynchronous-commit availability replica, every availability database should be in the SYNCHRONIZING state. On a synchronous-commit replica, every availability database should be in the SYNCHRONIZED state.Either a database administrator or the system has suspended data synchronization on this availability database.So how to get this database back to synchronizing state?
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May 19, 2015
Backing up all databases on a sql server that hosts secondary high availability databases as well as other databases. The other databases back up fine, but the high availability secondaries all get the same error:
BackupDiskFile::OpenMedia: Backup device 'F:MSSQLBackupdbnamedbname_backup_2015_MM_DD_tttttt_ttttttt.bak' failed to open. Operating system error 2(The system cannot find the file specified.)
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Jan 15, 2004
Hi!
Want 2 store Multiple room numbers of a hotel in a single column using SQL Server2k.
Can anybody tell me how to do it??
Thanx.
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Jul 11, 2014
I have a situation where I have two servers in SQL Server 2012 R2 AlwaysOn Availability Group. One is primary and the other one being secondary. I am only running SharePoint Database on it.I have run out of space on the primary server and about to run out of space at the secondary server. I have tried shrinking database transaction log files, but it returns an error that it cannot be shrunk as the database is in the AlwaysOn Availability Group.
Questions:
1. Several forums suggest that databases need to taken out of AlwaysOn Availability Group in order for the shrinking to work properply?
2. Would it have any impact on the database if it is taken out of availability group and then added back?
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Dec 1, 2015
I have configured replication between Always ON Availability Groups (Listener) (PUBLISHER), remote distributor to XYZ SUBSCRIBER...with above link ...
Now, I want to know how to replicate Data from XYZ SERVER a PUBLISHER to Always ON Availability Groups (Listener) (SUBSCRIBER)? Distributor Database being on XYZEX:
XYZ SQL SERVER as PUBLISHER, and DISTRIBUTOR
to
Always ON Availability Groups (Listener) SUBSCRIBER...
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Nov 20, 2015
need to migrate a cluster with an AG dtabases to new data center cluster with AG.
I was wondering if is possible to do mirroring on top of the AG configuration? or what other options could be to migrate a cluster that has 3 nodes and setup the ag databases to a new datacenter.
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Oct 16, 2014
This is my first deployment of an always on availability group for SQL 2014 and I'm trying to get my custom backup procedure to handle all databases appropriately depending on the primary group. Basiscally I want the system databases and all databases that don't participate in the availability group to be backed up on both nodes and those that do participate backed up ONLY on the primary server. I've looked at the sys.fn_hadr_backup_is_preferred_replica funcation, but would like to only have to test for a single databases existance in the availability group. If the one database is in the group, only backup the system databases and those that don't participate, otherwise backup everydatabase. This would be the case for both full backups and transaction logs.
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Jan 27, 2015
I Create an availibility Group with a primary and a secondary. (For test)
Then run Planed Failover.
Switched to secondary. That's ok.
After that I update some tables on secondary (That now is primary)
I Run Again Planed Failover on server 2.
Switched. OK
But primary database Get (Not synchronizing) Status.
And in primary I don't have that updates.
How to sync these databases and exit from Not synchronizing.
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May 2, 2008
Hi,
can I assign a NAS(Network Attached Storage) server to store the database file(readable and writable) and assign other several MS SQL database servers which will use the same database file in NAS to achieve the objective of high availability?
If it can, how can I set it up in MS SQL Server or it requires another 3rd patry software to set it up?
Thanks.
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Oct 29, 2015
I actually work in an organisation and we have to find a solution about the data consistancy in the database. our partners use to send details to the organisation and inserted directly in the database, so we want to create a new database as a buffer database to insert informations from the partners then make an update to the main database. is there a better solution instead of that?
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Feb 24, 2006
Hello everyone,I have a webcontrol that uses database-structures alot, it uses the system tables in SQL to read column information from tables. To ease the load of the SQL server I have a property that stores this information in a cache and everything works fine.I am doing some research to find if there are anyway to get information from the SQL server that the structure from a table has changed.I want to know if a column or table has changed any values, like datatype, name, properties, etc.Any suggestions out there ?!
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Jul 23, 2005
I have a system that basically stores a database within a database (I'msure lots have you have done this before in some form or another).At the end of the day, I'm storing the actual data generically in acolumn of type nvarchar(4000), but I want to add support for unlimitedtext. I want to do this in a smart fashion. Right now I am leaningtowards putting 2 nullable Value fields:ValueLong ntext nullableValueShort nvarchar(4000) nullableand dynamically storing the info in one or the other depending on thesize. ASP.NET does this exact very thing in it's Session State model;look at the ASPStateTempSessions table. This table has both aSessionItemShort of type varbinary (7000) and a SessionItemLong of typeImage.My question is, is it better to user varbinary (7000) and Image? I'mthinking maybe I should go down this path, simply because ASP.NET does,but I don't really know why. Does anyone know what would be the benifitof using varbinary and Image datatypes? If it's just to allow saving ofbinary data, then I don't really need that right now (and I don't thinkASP.NET does either). Are there any other reasons?thanks,dave
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