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  • How to access functions in extended classes efficiently?

    - by nischayn22
    In PHP I have classes as below class Animal { //some vars public function printname(){ echo $this->name; } } class AnimalMySql extends Animal { static public function getTableFields(){ return array(); } } class AnimalPostgreSql extends Animal { static public function getTableFields(){ return array(); } } Now I have an object $lion = new Animal(); and I want to do if($store == mysql) //getTableFields from class AnimalMySql else //getTableFields form class AnimalPostgreSql I am new to OOP and not sure what is the best way to call the method from the specific class P.S. Please leave a note with the answer to explain the efficiency of the approach

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  • Warning and error information in stored procedures revisited

    - by user13334359
    Originally way to handle warnings and errors in MySQL stored routine was designed as follows: if warning was generated during stored routine execution which has a handler for such a warning/error, MySQL remembered the handler, ignored the warning and continued execution after routine is executed MySQL checked if there is a remembered handler and activated if any This logic was not ideal and causes several problems, particularly: it was not possible to choose right handler for an instruction which generated several warnings or errors, because only first one was chosen handling conditions in current scope messed with conditions in different there were no generated warning/errors in Diagnostic Area that is against SQL Standard. First try to fix this was done in version 5.5. Patch left Diagnostic Area intact after stored routine execution, but cleared it in the beginning of each statement which can generate warnings or to work with tables. Diagnostic Area checked after stored routine execution.This patch solved issue with order of condition handlers, but lead to new issues. Most popular was that outer stored routine could see warnings which should be already handled by handler inside inner stored routine, although latest has handler. I even had to wrote a blog post about it.And now I am happy to announce this behaviour changed third time.Since version 5.6 Diagnostic Area cleared after instruction leaves its handler.This lead to that only one handler will see condition it is supposed to proceed and in proper order. All past problems are solved.I am happy that my old blog post describing weird behaviour in version 5.5 is not true any more.

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  • Extended service set help [closed]

    - by Cygnus X
    Sorry, this is going to be long and rambly. So, at home my network is set up as such: I have a "master router" that handles DHCP, from there I have a basic 5 port switch, and coming off that, I have a second router that I put in access point mode so that I could have better wireless coverage in my house. I cant seem to access it through a web browser since the master router kicked in and assigned it an ip address. But, i told you all that story, so that i could tell you this story. At the company I work for, they are trying to set up wireless cameras, according to the manual for these, in order to connect these cameras to our network, we need to get into the wireless router and associate the router with the cameras, but the problem is, the network is setup like my home network. Theres a "master router" which is a windows 2003 server, and then a wireless router in AP mode dishing out wireless access. I cant get into the router (by the way I'm not the system admin for the company, nor do i know jack squat about windows server , nor can I easily get in contact with the system admin. (quite the cluster f*k, eh?)) I've tried using wireshark to find the routers ip, dug through arp tables, tried plugging straight into the router, but I cant seem to get into the damn thing. Any ideas/suggestions would be greatly appreciated.

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  • Verify SQL Server Stored Procedures are the same on multiple servers

    I have a stored procedure I push down to all of my servers that does a custom backup job and I want to make sure all servers have the same stored procedure. Is there some way to check without going to each server and reviewing the stored procedure? Check out this to find out. New! SQL Monitor 3.0 Red Gate's multi-server performance monitoring and alerting tool gets results from Day One.Simple to install and easy to use – download a free trial today.

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  • Coping with infrastructure upgrades

    - by Fatherjack
    A common topic for questions on SQL Server forums is how to plan and implement upgrades to SQL Server. Moving from old to new hardware or moving from one version of SQL Server to another. There are other circumstances where upgrades of other systems affect SQL Server DBAs. For example, where I work at the moment there is an Microsoft Exchange (email) server upgrade in progress. It it being handled by a different team so I’m not wholly sure on the details but we are in a situation where there are currently 2 Exchange email servers – the old one and the new one. Users mail boxes are being transferred in a planned process but as we approach the old server being turned off we have to also make sure that our SQL Servers get updated to use the new SMTP server for all of the SQL Agent notifications, SSIS packages etc. My servers have a number of profiles so that various jobs can send emails on behalf of various departments and different systems. This means there are lots of places that the old server name needs to be replaced by the new one. Anyone who has set up DBMail and enjoyed the click-tastic odyssey of screens to create Profiles and Accounts and so on and so forth ought to seek some professional help in my opinion. It’s a nightmare of back and forth settings changes and it stinks. I wasn’t looking forward to heading into this mess of a UI and changing the old Exchange server name for the new one on all my SQL Instances for all of the accounts I have set up. So I did what any Englishmen with a shed would do, I decided to take it apart and see if I can fix it another way. I took a guess that we are going to be working in MSDB and Books OnLine was remarkably helpful and amongst a lot of information told me about a couple of procedures that can be used to interrogate DBMail settings. USE [msdb] -- It's where all the good stuff is kept GO EXEC dbo.sysmail_help_profile_sp; EXEC dbo.sysmail_help_account_sp; Both of these procedures take optional parameters with the same name – ID and Name. If you provide an ID or a name then the results you get back are for that specific Profile or Account. Otherwise you get details of all Profiles and Accounts on the server you are connected to. As you can see (click for a bigger image), the Account has the SMTP server information in the servername column. We want to change that value to NewSMTP.Contoso.com. Now it appears that the procedure we are looking at gets it’s data from the sysmail_account and sysmail_server tables, you can get the results the stored procedure provides if you run the code below. SELECT [account_id] , [name] , [description] , [email_address] , [display_name] , [replyto_address] , [last_mod_datetime] , [last_mod_user] FROM dbo.sysmail_account AS sa; SELECT [account_id] , [servertype] , [servername] , [port] , [username] , [credential_id] , [use_default_credentials] , [enable_ssl] , [flags] , [last_mod_datetime] , [last_mod_user] , [timeout] FROM dbo.sysmail_server AS sms Now, we have no real idea how these tables are linked and whether making an update direct to one or other of them is going to do what we want or whether it will entirely cripple our ability to send email from SQL Server so we wont touch those tables with any UPDATE TSQL. So, back to Books OnLine then and we find sysmail_update_account_sp. It’s exactly what we need. The examples in BOL take the form (as below) of having every parameter explicitly defined. Not wanting to totally obliterate the existing values by not passing values in all of the parameters I set to writing some code to gather the existing data from the tables and re-write the SMTP server name and then execute the resulting TSQL. IF OBJECT_ID('tempdb..#sysmailprofiles') IS NOT NULL DROP TABLE #sysmailprofiles GO CREATE TABLE #sysmailprofiles ( account_id INT , [name] VARCHAR(50) , [description] VARCHAR(500) , email_address VARCHAR(500) , display_name VARCHAR(500) , replyto_address VARCHAR(500) , servertype VARCHAR(10) , servername VARCHAR(100) , port INT , username VARCHAR(100) , use_default_credentials VARCHAR(1) , ENABLE_ssl VARCHAR(1) ) INSERT [#sysmailprofiles] ( [account_id] , [name] , [description] , [email_address] , [display_name] , [replyto_address] , [servertype] , [servername] , [port] , [username] , [use_default_credentials] , [ENABLE_ssl] ) EXEC [dbo].[sysmail_help_account_sp] DECLARE @TSQL NVARCHAR(1000) SELECT TOP 1 @TSQL = 'EXEC [dbo].[sysmail_update_account_sp] @account_id = ' + CAST([s].[account_id] AS VARCHAR(20)) + ', @account_name = ''' + [s].[name] + '''' + ', @email_address = N''' + [s].[email_address] + '''' + ', @display_name = N''' + [s].[display_name] + '''' + ', @replyto_address = N''' + s.replyto_address + '''' + ', @description = N''' + [s].[description] + '''' + ', @mailserver_name = ''NEWSMTP.contoso.com''' + +', @mailserver_type = ' + [s].[servertype] + ', @port = ' + CAST([s].[port] AS VARCHAR(20)) + ', @username = ' + COALESCE([s].[username], '''''') + ', @use_default_credentials =' + CAST(s.[use_default_credentials] AS VARCHAR(1)) + ', @enable_ssl =' + [s].[ENABLE_ssl] FROM [#sysmailprofiles] AS s WHERE [s].[servername] = 'SMTP.Contoso.com' SELECT @tsql EXEC [sys].[sp_executesql] @tsql This worked well for me and testing the email function EXEC dbo.sp_send_dbmail afterwards showed that the settings were indeed using our new Exchange server. It was only later in writing this blog that I tried running the sysmail_update_account_sp procedure with only the SMTP server name parameter value specified. Despite what Books OnLine might intimate, you can do this and only the values for parameters specified get changed. If a parameter is not specified in the execution of the procedure then the values remain unchanged. This renders most of the above script unnecessary as I could have simply specified the account_id that I want to amend and the new value for the parameter I want to update. EXEC sysmail_update_account_sp @account_id = 1, @mailserver_name = 'NEWSMTP.Contoso.com' This wasn’t going to be the main reason for this post, it was meant to describe how to capture values from a stored procedure and use them in dynamic TSQL but instead we are here and (re)learning the fact that Books Online is a little flawed in places. It is a fantastic resource for anyone working with SQL Server but the reader must adopt an enquiring frame of mind and use a little curiosity to try simple variations on examples to fully understand the code you are working with. I think the author(s) of this part of Books OnLine missed an opportunity to include a third example that had fewer than all parameters specified to give a lead to this method existing.

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  • How does SQL Server treat statements inside stored procedures with respect to transactions?

    - by Sleepless
    Hi All! Say I have a stored procedure consisting of several seperate SELECT, INSERT, UPDATE and DELETE statements. There is no explicit BEGIN TRANS / COMMIT TRANS / ROLLBACK TRANS logic. How will SQL Server handle this stored procedure transaction-wise? Will there be an implicit connection for each statement? Or will there be one transaction for the stored procedure? Also, how could I have found this out on my own using T-SQL and / or SQL Server Management Studio? Thanks!

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  • does mysql stored procedures support data types like array, hash,etc?

    - by Yang
    i am creating a mysql function which takes in a varchar and change it to a int based on a mapping table. select name, convert_to_code(country) from users where sex = 'male' here, the convert_to_code() function takes in a country name (e.g. Japan, Finland..) and change it to country code which is an integer (e.g. 1001, 2310..) based on a mapping table called country_maping like below: country_name (varchar) | country_code (int) Japan | 1001 Finland | 2310 Canada | 8756 currently, the stored function need to select country_code from country_mapping where country_name = country_name and return the query result. is that possible to create a hash data struct in SP to optimize the process so that it will not need to perform the query for each row matches the where clause. thanks in advance!

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  • Is this a valid benefit of using embedded SQL over stored procedures?

    - by George
    Here's an argument for SPs that I haven't heard. Flamers, be gentle with the down tick, Since there is overhead associated with each trip to the database server, I would suggest that a POSSIBLE reason for placing your SQL in SPs over embedded code is that you are more insulated to change without taking a performance hit. For example. Let's say you need to perform Query A that returns a scalar integer. Then, later, the requirements change and you decide that it the results of the scalar is x that then, and only then, you need to perform another query. If you performed the first query in a SP, you could easily check the result of the first query and conditionally execute the 2nd SQL in the same SP. How would you do this efficiently in embedded SQL w/o perform a separate query or an unnecessary query? Here's an example: --This SP may return 1 or two queries. SELECT @CustCount = COUNT(*) FROM CUSTOMER IF @CustCount 10 SELECT * FROM PRODUCT Can this/what is the best way to do this in embedded SQL?

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  • Pasting extended ACL contents into telnet session to Cisco Router SIM

    - by Kyle Brandt
    I have a telnet session to a dynamips router sim. When I try to paste the contents of an actually working ACL retrieved from 'show run' into the access list, only part of gets pasted. The session is something like: enable conf t ip access-list extended Internet <PASTE of Rules> It stops right in the middle of a line: permit tcp any host 123.123.123.123 gt 1 ! should be gt 1023 Anyone know what is happening? The source is an extended access list.

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  • An XEvent a Day (19 of 31) – Using Customizable Fields

    - by Jonathan Kehayias
    Today’s post will be somewhat short, but we’ll look at Customizable Fields on Events in Extended Events and how they are used to collect additional information.  Customizable Fields generally represent information of potential interest that may be expensive to collect, and is therefore made available for collection if specified by the Event Session.  In SQL Server 2008 and 2008 R2, there are 50 Events that have customizable columns in their payload.  In SQL Server Denali CTP1, there...(read more)

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  • An XEvent a Day (13 of 31) – The system_health Session

    - by Jonathan Kehayias
    Today’s post was originally planned for this coming weekend, but seems I’ve caught whatever bug my kids had over the weekend so I am changing up today’s blog post with one that is easier to cover and shorter.  If you’ve been running some of the queries from the posts in this series, you have no doubt come across an Event Session running on your server with the name of system_health.  In today’s post I’ll go over this session and provide links to references related to it. When Extended Events...(read more)

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  • An XEvent a Day (14 of 31) – A Closer Look at Predicates

    - by Jonathan Kehayias
    When working with SQL Trace, one of my biggest frustrations has been the limitations that exist in filtering.  Using sp_trace_setfilter to establish the filter criteria is a non-trivial task, and it falls short of being able to deliver complex filtering that is sometimes needed to simplify analysis.  Filtering of trace data was performed globally and applied to the trace affecting all of the events being collected.  Extended Events introduces a much better system of filtering using...(read more)

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  • An XEvent a Day (15 of 31) – Tracking Ghost Cleanup

    - by Jonathan Kehayias
    If you don’t know anything about Ghost Cleanup, I recommend highly that you go read Paul Randal’s blog posts Inside the Storage Engine: Ghost cleanup in depth , Ghost cleanup redux , and Turning off the ghost cleanup task for a performance gain .  To my knowledge Paul’s posts are the only things that cover Ghost Cleanup at any level online. In this post we’ll look at how you can use Extended Events to track the activity of Ghost Cleanup inside of your SQL Server.  To do this, we’ll first...(read more)

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  • An XEvent a Day (17 of 31) – A Look at Backup Internals and How to Track Backup and Restore Throughput (Part 1)

    - by Jonathan Kehayias
    Today’s post is a continuation of yesterday’s post How Many Checkpoints are Issued During a Full Backup? and the investigation of Database Engine Internals with Extended Events.  In today’s post we’ll look at how Backup’s work inside of SQL Server and how to track the throughput of Backup and Restore operations.  This post is not going to cover Backups in SQL Server as a topic; if that is what you are looking for see Paul Randal’s TechNet Article Understanding SQL Server Backups . Yesterday...(read more)

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  • An XEvent a Day (16 of 31) – How Many Checkpoints are Issued During a Full Backup?

    - by Jonathan Kehayias
    This wasn’t my intended blog post for today, but last night a question came across #SQLHelp on Twitter from Varun ( Twitter ). #sqlhelp how many checkpoints are issued during a full backup? The question was answered by Robert Davis (Blog|Twitter) as: Just 1, at the very start. RT @ 1sql : #sqlhelp how many checkpoints are issued during a full backup? This seemed like a great thing to test out with Extended Events so I ran through the available Events in SQL Server 2008, and the only Event related...(read more)

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  • A quick note about the end of SQL Server 2005 mainstream support

    - by AaronBertrand
    In a previous blog post about Service Pack 4 , I said the following: "...from this point forward all you're likely to see are cumulative updates to the SP3 and SP4 branches and, roughly a year from today, mainstream support will only need to maintain the SP4 branch. You can read more about this in the following blog post from the CSS blog: Mainstream vs Extended Support and SQL Server 2005 SP4: Can someone explain all of this? " In that post, I focused on these words in the product lifecycle chart:...(read more)

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  • An XEvent a Day (8 of 31) – Targets Week – synchronous_event_counter

    - by Jonathan Kehayias
    Yesterday’s post, Targets Week - Bucketizers , looked at the bucketizer Targets in Extended Events and how they can be used to simplify analysis and perform more targeted analysis based on their output.  Today’s post will be fairly short, by comparison to the previous posts, while we look at the synchronous_event_counter target, which can be used to test the impact of an Event Session without actually incurring the cost of Event collection. What is the synchronous_event_counter? The synchronous_event_count...(read more)

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  • An XEvent a Day (9 of 31) – Targets Week – pair_matching

    - by Jonathan Kehayias
    Yesterday’s post, Targets Week – synchronous_event_counter , looked at the counter Target in Extended Events and how it could be used to determine the number of Events a Event Session will generate without actually incurring the cost to collect and store the Events.  Today’s post is coming late, I know, but sometimes that’s just how the ball rolls.  My original planned demo’s for today’s post turned out to only work based on a fluke, though they were very consistent at working as expected,...(read more)

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  • An XEvent a Day (30 of 31) – Tracking Session and Statement Level Waits

    - by Jonathan Kehayias
    While attending PASS Summit this year, I got the opportunity to hang out with Brent Ozar ( Blog | Twitter ) one afternoon while he did some work for Yanni Robel ( Blog | Twitter ).  After looking at the wait stats information, Brent pointed out some potential problem points, and based on that information I pulled up my code for my PASS session the next day on Wait Statistics and Extended Events and made some changes to one of the demo’s so that the Event Session only focused on those potentially...(read more)

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