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Does enabling readable secondary in the availability group put any load on the primary server's tempdb?

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guilherme last edited by

Enabling readable secondary will result in addition of 14byte extra information to each row in the primary as well as secondary.

This will also automatically enable the snapshot isolation level on the secondary which will result in additional load on the secondary server's tempdb.

Is there any chance this will put any load on the primary server's tempdb?
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tahishae last edited by

The load on TempDB in an availability group will be determined by the work load happening on a given replica, plus the isolation level of the replica. With a secondary replica having read enabled, it’s now possible for workloads to occur on that replica, and impact TempDB. Additionally, RCSI is automatically enabled on readable secondaries, resulting in extra overhead on TempDB as different versions of rows are stored in TempDB as queries are running.

However, the primary will not take on this same isolation behavior, simply due to the secondary having reads enabled. Without RCSI being enabled on the primary, it will not see the additional overhead.

Now, if you choose to enable RCSI on the primary, then it’s TempDB usage would be impacted in the same manner as the readable secondary replicas.
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CLR Assemblies and SQL Server Availability Groups
SQL, Database Testing • sql server sql server 2012 availability groups sql c languagelr • • Jolied

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When you create a mirror of the database the "trustworthy" flag is set to false by default. And you need to sync the SID of the dbo on each side (I don't understand how this works for the SA user. Need to study more. To resolve the issue I failed the database over to the secondary node. Set Trustworthy to True. After that I attempted to run the Procedure and got a failure related to the SID not being registered (sorry forgot to capture the message). Since the database was owned by SA i decided to remove and readd the assemblies. After removing and readding the assemblies i was able to then run the assembly on the node. At that point I failed everything back to the primary node where I was able to run the assembly. So I failed back and forth a few times and the assembly works on both sides. While this worked for us I'm still not entirely certain how SIDs for the SA user work on both sides. To summarize: - You have to failover to the secondary to set Trustworthy to True - While the secondary was in read-write Drop and ReADD the assemblies on the second node (while acting as primary) - That seemed to enable the assembly to run on both sides. Thanks to Aaron and srutzky who guided me to a working solution. If anyone can better explain why what I did worked I'd be glad to know.
Cross Database transactions with Availability Groups
SQL, Database Testing • sql server 2012 availability groups msdtc language • • carriann

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The article isn't well worded but here's what I think it's saying Beginning scenario - DatabaseA is in an AG and is currently primary on Server1 and can run on Server2. DatabaseB can only run on Server1 T1 - Transaction begins T2 - Row inserted into DatabaseA (log not yet sent to Server2 though) T3 - Row inserted into DatabaseB T4 - Transaction commit called T5 - DatabaseB commits transaction (since the two DBs commit individually) T6 - DatabaseA fails over before log is sent Since the log was never sent DatabaseA wouldn't have the row but DatabaseB would. If synchronous mode is being used that can't happen because the commit can't be called until the log from the row is sent. However, it may be possible for the commit on DatabaseB to happen and DatabaseA to fail over before the commit happens there. This may lead to a rollback in DatabaseA instead of a commit. I can't say with certainly that you can get into the same situation with synchronous mode but if you can that's how it would likely happen.
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Updating a column name to be a concatenation based on the same table
SQL, Database Testing • sql server update • • Burma

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I am not quite sure if I understand your data model from your description, so please check the data to be updated before running it. You can break the update into two separate statements with a temp table or CTE, which will give you the benefit of seeing the records you want to update. (Use a select from the temp table or CTE beforehand to verify the records found.) Example -- Load a temp table with students to update DROP TABLE IF EXISTS #X SELECT student_id INTO #X FROM Grades GROUP BY student_id HAVING COUNT(DISTINCT profession) > 1 -- Assuming they could have multiple grades. UPDATE G SET profession = CONCAT(profession," + ",grade) SET FROM Grades G INNER JOIN #X X ON G.student_id = X.student_id WHERE X.student_id IS NOT NULL -- Always helpful to have WHERE clause to avoid any accidents.
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Show the last registration of each warranty type
Software Programming • sql server sql • • authera

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With a subconsult, you solve it. The subconsulta returns all the last guarantees, with the id and the date, maximum and with it we make a join with the headboard. SELECT * FROM TB_OBJETO_GARANTIA TOG INNER JOIN ( SELECT ID_GARANTIA, MAX(FECHA_INGRESO) AS fecha_max FROM TB_GARANTIA WHERE TG.ID_ESTADO='ACT' GROUP BY ID_GARANTIA ) TG ON TOG.ID_OBJETO_GARANTIA = TG.ID_GARANTIA
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Why we design distributed availability group?
SQL, Database Testing • sql server sql server 2016 availability groups high availability • • jonetta

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What is the distributed high availability benefit which we can not leverage with traditional AG? If you can explain one scenario of failover which we can not avail in traditional AG? Distributed availability groups are a new feature introduced in SQL Server 2016, as a variation of the existing Always On Availability Groups feature. No announcements have been made as to whether future versions of SQL Server will allow previous versions to participate in the same distributed availability group. If that scenario were enabled, it would allow distributed availability groups to be part of a SQL Server version upgrade plan. For your understanding I have just copy and paste the appropriate stanza articles from the documentation for Distributed availability groups: A distributed availability group is a special type of availability group that spans two separate availability groups. The underlying availability groups are configured on two different Windows Server Failover Clustering (WSFC) clusters. The availability groups that participate in a distributed availability group do not need to be in the same location. They can be physical, virtual, on-premises, in the public cloud, or anywhere that supports an availability-group deployment. As long as two availability groups can communicate, you can configure a distributed availability group with them. The following figure shows a high-level view of a distributed availability group that spans two availability groups (AG 1 and AG 2), each configured on its own WSFC cluster. The distributed availability group has a total of four replicas, with two in each availability group. Each availability group can support up to the maximum number of replicas, so a distributed availability group based on Standard Edition can have up to four replicas, and one based on Enterprise Edition can have up to 18 total replicas. The individual WSFC clusters and their corresponding availability groups follow traditional rules. That is, they can be joined to a domain or not joined to a domain (Windows Server 2016 or later). When two different availability groups are combined in a single distributed availability group, there are four scenarios: Both WSFC clusters are joined to the same domain. Each WSFC cluster is joined to a different domain. One WSFC cluster is joined to a domain, and one WSFC cluster is not joined to a domain. Neither WSFC cluster is joined to a domain. Your second question: In which scenario the design of distributed AG is preferable? Again, quoting from the same documentation: Here are the three main usage scenarios for a distributed availability group: Disaster recovery and easier multi-site configurations Migration to new hardware or configurations, which might include using new hardware or changing the underlying operating systems Increasing the number of readable replicas beyond eight in a single availability group by spanning multiple availability groups
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Internals of Windows-to-Windows SQL Server data transfer
SQL, Database Testing • mysql sql server windows • • jules

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There is a difference: An RDBMS is optimised for such bulk row operations A client app has to process row by row You have factors like: buffering of output while the client consumes it but for an RDBMS this doesn't matter SQL Server + Windows integration choice of engine in MySQL
SQL Server TempDB Growth issue
SQL, Database Testing • sql server 2008 r2 tempdb • • Marcee

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If you have the default trace configured, and if the change was recent enough, you might be able to find the change. The default trace only maintains a certain amount of trace, but I have found unexpected changes by examining its contents. See: http://msdn.microsoft.com/en-us/library/ms175513(v=sql.105).aspx This describes how to read the default trace so that you can research problems. There is no backward looking tool to find database growth and other changes. If you want to have a persisted history of changes you will need to periodically query the needed data and store it in a database table. With SQL Server 2012 Change Tracking can also answer questions like this.
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Taking Back up on Non readable Secondary Replica Availability group
SQL, Database Testing • sql server backup availability groups dbc languagec language c • • nishika

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Backups are only allowed in readable secondaries, so not really. Also you need to take in mind that running checkdb might be considered a production workload if you don't run it in production too. You should be running checkdb on all your databases regardless primary or secondary and also your backups, that way you wouldn't have to license the instance where you restore your backups and run checkdb on them (you are validating backups, not production databases), otherwise MS can make you pay for that, but I'm not a licensing expert, so better ask to confirm this point.
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See all sql tables
Software Programming • sql server sql mvc • • rosemadder

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Good, see this example:SELECT * FROM dbo.YourStudentTable FOR XML PATH('Student'), ROOT ('Students') taken from https://stackoverflow.com/questions/18654157/how-to-make-sql-query-result-to-xml-file
Does this regex reliably remove square brackets from T-SQL?
SQL, Database Testing • sql server t sql ssms identifier • • inna

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When I first answered this question the rules for what characters would determine valid or invalid were a bit hazy (the documentation isn't entirely clear on it, and is in some ways misleading). However, since that time I have done some research into the specific rules for valid regular identifiers (i.e. those that do not need to be delimited by either "name" or [name]) related to this DBA.SE question: How to create Unicode parameter and variable names and have discovered the exact rules. The research into getting those exact rules lead to finding a list of Unicode Categories (not blocks) that can be used in combination to determine both the "first" / "start" character and any possible "subsequent" / "continue" characters. That research is towards the end of this post (Steps 7 and 8): The Uni-Code: The Search for the True List of Valid Characters for T-SQL Regular Identifiers, Part 2 Reworking your pattern I came up with the following: (?![(?i:PRIMARY|GROUP)])[([\p{L}\p{Nl}\u0023\u005F\uFF3F][\p{L}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\p{Cf}\u0023\u0024\u0040]*)](?!]) Some notes: You don't need to "or" the separate items together with a | in a character class (i.e. the [stuff_here]) as it is already a list. In fact, including the pipe symbol actually means you were adding it to the list of allowed characters ;-). You need to separate out the exclusion list (i.e. PRIMARY|GROUP...) such that they can be wrapped in [ and ]. Otherwise you allow for something like [PRIMARYa] to get skipped and keep its delimiters. I added (?!]) to the end to account for embedded escaped end-delimiters: ]]. This pattern is 99.5% effective. The only thing it does not catch is if you have both: an embedded leading delimiter: [, AND no embedded escaped end-delimiter: ] Meaning, [Te[st] will erroneously un-delimit it to be [Test (oops), but both [Te[s]]t] and [Tes]]t] will remain delimited as expected. And really, how often are there embedded delimiters? And even then, how often is there just the beginning delimiter and not the ending delimiter? Very rare, I would think. Of course, I said it was 99.5% effective but it only catches 2 reserved words. Easy enough to fix since we can get the list of reserved words. Adding in all 185 reserved words (well, 184 as I left out "WITHIN GROUP" since it has a space in it and is thus naturally excluded) gives us the following: ( I made it a comment instead of a code block so that it would be readable since it is a single line [that can be copied and pasted into the "Find" box] ) (?![(?i:ADD|ALL|ALTER|AND|ANY|AS|ASC|AUTHORIZATION|BACKUP|BEGIN|BETWEEN|BREAK|BROWSE|BULK|BY|CASCADE|CASE|CHECK|CHECKPOINT|CLOSE|CLUSTERED|COALESCE|COLLATE|COLUMN|COMMIT|COMPUTE|CONSTRAINT|CONTAINS|CONTAINSTABLE|CONTINUE|CONVERT|CREATE|CROSS|CURRENT|CURRENT_DATE|CURRENT_TIME|CURRENT_TIMESTAMP|CURRENT_USER|CURSOR|DATABASE|DBCC|DEALLOCATE|DECLARE|DEFAULT|DELETE|DENY|DESC|DISK|DISTINCT|DISTRIBUTED|DOUBLE|DROP|DUMP|ELSE|END|ERRLVL|ESCAPE|EXCEPT|EXEC|EXECUTE|EXISTS|EXIT|EXTERNAL|FETCH|FILE|FILLFACTOR|FOR|FOREIGN|FREETEXT|FREETEXTTABLE|FROM|FULL|FUNCTION|GOTO|GRANT|GROUP|HAVING|HOLDLOCK|IDENTITY|IDENTITY_INSERT|IDENTITYCOL|IF|IN|INDEX|INNER|INSERT|INTERSECT|INTO|IS|JOIN|KEY|KILL|LEFT|LIKE|LINENO|LOAD|MERGE|NATIONAL|NOCHECK|NONCLUSTERED|NOT|NULL|NULLIF|OF|OFF|OFFSETS|ON|OPEN|OPENDATASOURCE|OPENQUERY|OPENROWSET|OPENXML|OPTION|OR|ORDER|OUTER|OVER|PERCENT|PIVOT|PLAN|PRECISION|PRIMARY|PRINT|PROC|PROCEDURE|PUBLIC|RAISERROR|READ|READTEXT|RECONFIGURE|REFERENCES|REPLICATION|RESTORE|RESTRICT|RETURN|REVERT|REVOKE|RIGHT|ROLLBACK|ROWCOUNT|ROWGUIDCOL|RULE|SAVE|SCHEMA|SECURITYAUDIT|SELECT|SEMANTICKEYPHRASETABLE|SEMANTICSIMILARITYDETAILSTABLE|SEMANTICSIMILARITYTABLE|SESSION_USER|SET|SETUSER|SHUTDOWN|SOME|STATISTICS|SYSTEM_USER|TABLE|TABLESAMPLE|TEXTSIZE|THEN|TO|TOP|TRAN|TRANSACTION|TRIGGER|TRUNCATE|TRY_CONVERT|TSEQUAL|UNION|UNIQUE|UNPIVOT|UPDATE|UPDATETEXT|USE|USER|VALUES|VARYING|VIEW|WAITFOR|WHEN|WHERE|WHILE|WITH|WRITETEXT)])[([\p{L}\p{Nl}\u0023\u005F\uFF3F][\p{L}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\p{Cf}\u0023\u0024\u0040]*)](?!]) Also, with the new pattern you will need to change the replacement to be $1 instead of $2. I tested with the following: SELECT [f], [p$o], -- match these [prImary], [12y], [a b], [g%g], [j^6], [f¾], [u²], [h⁊], [s|w] FROM dbo.[$a], dbo.[#a], dbo.[@d], dbo.[_a] -- match these WHERE f.[&col1] = N'it will also [match] That all being said, I will reiterate what I originally said in a comment on the question: Is making the script "look nicer" worth any amount of risk of potential errors? I would say "no". I used to remove square brackets for pretty much the same reason, but have gotten to the place where I now always add them because "guaranteed working" beats aesthetics. For me. I realize not for everyone. Of course, if you are more comfortable with .NET RegEx, then SQL# (which I wrote) has RegEx_Replace for free . Also, keep in mind that this is a global search and replace, so it will match strings of this pattern even if they are in comments or string literals. If you have such strings then this might not be desirable and you will either need to find a way to exclude those (especially string literals), or give up this fight ;).
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How can you make the union of several columns, of different tables to form a table in sql server?
Software Programming • sql server sql • • Avante

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The union is possible. Suppose the following data:create table productos ( id_producto int, nombre varchar(32) ) create table preguntas ( id_pregunta int, pregunta varchar(32) ) insert into productos values (1, 'Cervezas') insert into productos values (2, 'Pañales') insert into productos values (3, 'Gaseosas') insert into productos values (4, 'Lacteos') insert into productos values (5, 'Harinas') insert into preguntas values (1, 'Le gusta la opcion 1 o 2?') insert into preguntas values (2, 'Le gusta menos o mas?') insert into preguntas values (3, 'Que marca le gusta?') insert into preguntas values (4, 'Le gusta la opcion 3 o 4?') insert into preguntas values (5, 'Cual es su sabor favorito') The problem of joining the tables without a criterion is that we result in Cartesian product of both:select nombre, pregunta from productos, preguntas This is the result:nombre pregunta Cervezas Le gusta la opcion 1 o 2? Cervezas Le gusta menos o mas? Cervezas Que marca le gusta? Cervezas Le gusta la opcion 3 o 4? Cervezas Cual es su sabor favorito Pañales Le gusta la opcion 1 o 2? Pañales Le gusta menos o mas? Pañales Que marca le gusta? Pañales Le gusta la opcion 3 o 4? Pañales Cual es su sabor favorito Gaseosas Le gusta la opcion 1 o 2? Gaseosas Le gusta menos o mas? Gaseosas Que marca le gusta? Gaseosas Le gusta la opcion 3 o 4? Gaseosas Cual es su sabor favorito Lacteos Le gusta la opcion 1 o 2? Lacteos Le gusta menos o mas? Lacteos Que marca le gusta? Lacteos Le gusta la opcion 3 o 4? Lacteos Cual es su sabor favorito Harinas Le gusta la opcion 1 o 2? Harinas Le gusta menos o mas? Harinas Que marca le gusta? Harinas Le gusta la opcion 3 o 4? Harinas Cual es su sabor favorito (25 rows)Execution time: 0.029 seconds If we add a criterion that can relate both tables would be ideal. For example:select nombre, pregunta from productos, preguntas where id_producto = id_pregunta It returns us:nombre pregunta Cervezas Le gusta la opcion 1 o 2? Pañales Le gusta menos o mas? Gaseosas Que marca le gusta? Lacteos Le gusta la opcion 3 o 4? Harinas Cual es su sabor favorito (5 rows)Execution time: 0.037 seconds Now we use an instruction https://www.w3schools.com/sql/sql_select_into.asp to create a new table from these columns:select nombre, pregunta into productos_preguntas from productos, preguntas where id_producto = id_pregunta select * from productos_preguntas And we have our data:nombre pregunta Cervezas Le gusta la opcion 1 o 2? Pañales Le gusta menos o mas? Gaseosas Que marca le gusta? Lacteos Le gusta la opcion 3 o 4? Harinas Cual es su sabor favorito (5 rows)Execution time: 0.033 seconds If it doesn't matter that the data is repeated, you can ignore the criterion and leave it like this:select nombre, pregunta into productos_preguntas from productos, preguntas
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Secondary Clustered DTC will not work when Primary goes offline - SQL Server Issues
SQL, Database Testing • sql server msdtc language • • terrea

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I don't believe what you want to do is possible through Windows or SQL Server configuration. Per Microsoft's guidance here, SQL Server will choose an MSDTC instance when it starts and, if that MSDTC instance fails, distributed transactions will fail: What happens if the MSDTC Resource that was picked at SQL Service startup fails? If the MSDTC instance that is being used by a specific SQL Server Group fails, SQL Server does not automatically attempt to use the next available MSDTC Resource such as the default cluster instance or the local machine instance of MSDTC. You would need to completely remove the failed instance of MSDTC from the SQL Server group to use another instance of MSDTC. Likewise, if you create a mapping for SQL Server and the mapped instance of MSDTC fails, your distributed transactions will also fail. If you want SQL Server to use a different instance of MSDTC, you must either add an instance of MSDTC to the local cluster group of the SQL Server or delete the mapping. This matches the behavior you're seeing; SQL Server successfully opens DTC transactions through DTC1 but doesn't automatically switch to using DTC2 if DTC1 fails. In some cursory tests I found: DTC transactions resumed working when the failed MSDTC instance recovered. SQL Server was indeed able to automatically switch to using a different MSDTC resource without a restart after the MSDTC resource it was using was deleted (as opposed to just failed). The tests I ran weren't comprehensive and there might be scenarios where these findings aren't true. The more important point in the document is that you may not need to cluster MSDTC at all: What will SQL do if I do not Cluster MSDTC in Windows 2008 and above? If there is no MSDTC resource in the cluster then SQL Server will use the MSDTC service that is running locally on the node. What is the Simple recommendation for MSDTC with Windows 2008 and later? In Windows 2008 and later you either Create a clustered instance of the MSDTC resource for EVERY SQL Server instance /Group that requires its functionality or DO NOT CLUSTER MSDTC at all. Based on this, you should be able to achieve pretty good high availability by relying on local MSDTC resources (in which case you might need to configure them to restart automatically on failure) or through adding a clustered MSDTC resource to each SQL Server cluster group if you prefer for some reason. Windows can handle restarting the service on failure, and SQL Server appears to successfully resume creating DTC transactions once the MSDTC service recovers. If you're trying to protect against scenarios not covered here (e.g., what happens if the DTC resource fails and can't restart automatically?) you might be forced to deal with that manually or at the application layer. It will be interesting to see if Microsoft provides you with different advice.
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How can I recover the id from Table A and take it to Table B to release a record?
Software Programming • sql server sql • • rosemadder

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so you have to make an insert in Table A and then recover your id to insert it in table B$stmt = $dbh->prepare("INSERT INTO A(name, email) VALUES(?,?)"); $tmt->execute( array('user', 'user@example.com')); print $dbh->lastInsertId() $stmt = $dbh->prepare("INSERT INTO B(name, email) VALUES(?,?)"); $tmt->execute( array('user', 'user@example.com'));
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Always On availability group - Standard Edition
SQL, Database Testing • sql server sql server 2019 high availability • • derk

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is that even possible and if that makes sense to use that on production? Yes it's possible, but if it makes sense for your production environment really depends on your needs. As you've already noted, there's https://docs.microsoft.com/en-us/sql/database-engine/availability-groups/windows/basic-availability-groups-always-on-availability-groups?view=sql-server-ver15#limitations . One of the other big limitations is the fact it can't be used as a read replica (so it just sits dormant until you need to failover to it): Basic availability groups include the following limitations: Limit of two replicas (primary and secondary). Basic Availability Groups for SQL Server 2017 on Linux support an additional configuration only replica. No read access on secondary replica. No backups on secondary replica. No integrity checks on secondary replicas. No support for replicas hosted on servers running a version of SQL Server prior to SQL Server 2016 Community Technology Preview 3 (CTP3). Support for one availability database. Basic availability groups cannot be upgraded to advanced availability groups. The group must be dropped and re-added to a group that contains servers running only SQL Server 2016 Enterprise Edition. Basic availability groups are only supported for Standard Edition servers. Basic availability groups cannot be part of a distributed availability group. You may have multiple Basic availability groups connected to a single instance of SQL Server. If you don't need to use the secondary to read from, and your goal is strictly to have a copy of the database to failover to during a disaster event, and you can tolerate the other aforementioned limitations then Basic Availability Groups can work for you in production. Though if you have a large number of databases you want to add to an Availability Group, then you might find it unmanageable with just Basic Availability Groups, and you may prefer regular AlwaysOn Availability Groups instead which allow multiple databases to be added to a single Availability Group. That's for you to decide though. Lastly, do I have to license server B as a passive replica? We don't normally answer specific licensing questions, but this one is simple enough to say yes, whenever you're doing production work on a SQL Server instance (even a dormant Basic Availability Group secondary replica), you need to adhere to all normal licensing rules for that instance. As AMTwo and Marcin point out, it's possible those rules are already adhered to via SA (Software Assurance) but we wouldn't be able to answer that, only your licensing vendor could. To find out more specific information on licensing, please see https://www.microsoft.com/en-us/licensing/product-licensing/sql-server and / or discuss with your vendor. All of the aforementioned information on licensing is not guaranteed fact, and should be discussed with your vendor regardless. Neither I nor StackExchange take any responsibility legally or otherwise, to how it's interpreted or used.
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Temporarily Archive Databases on SQL Server 2008 R2
SQL, Database Testing • sql server sql server 2008 r2 • • terrea

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To answer your questions first: What are the potential pitfalls with temporarily renaming a database? At this scale, it'd be bothersome and just potentially messy to be renaming this many databases multiple times in the case some are needed. It may be a pain cutting off all connections when re-naming and could confuse other users as well. Does MSSQL remove any logins or authentication information when a database is renamed and then renamed back? Nope! Not an issue. Does anyone have a more standardized recommendation for this process, or a direction to point me to get me researching further? In this case, I'd probably just take the databases OFFLINE temporarily to see if they are needed. You can do this via the GUI by right-clicking a database, Task -> Take Offline, or via TSQL: ALTER DATABASE [dbname] SET OFFLINE; When a database is offline, all connections are closed and no new connections can be made to it. It's quick to bring it back online if required: ALTER DATABASE [dbname] SET ONLINE; Plus, when the database is offline it's using less resources than an online database, so it may be better for performance in the mean time as well.

Does enabling readable secondary in the availability group put any load on the primary server's tempdb?

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