Sometimes, when all else fails, it is necessary to add hints to a piece of SQL in order to make the optimizer use a particular execution plan. Three critical SQL injections vulnerabilities in Oracle's popular E-Business Suite make up a total of 250 bugs patched for the company's quarterly Critical.
Одной из таких очередей может оказаться очередь заданий утилиты datapump. Oracle Database 10g Enterprise Edition Release 10. SQL> exec dbms_aqadm. Drop_queue_table(queue_table =>'SYS. PL/SQL procedure successfully completed.
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SQL> BEGIN dbms_aqadm. Create_queue_table(queue_table => 'SYS. KUPC$DATAPUMP_QUETAB', multiple_consumers => TRUE, queue_payload_type =>'SYS. KUPC$_MESSAGE', comment => 'DataPump Queue Table', compatible=>'8. PL/SQL procedure successfully completed. Далее, необходимо снова запустить на выполнение скрипт utlrp. PL/SQL procedure successfully completed. Повторная перекомпиляция занимает незначительное время, т. Перекомпилируются только объекты в состоянии INVALID. В результате всех проделанных шагов вы будете иметь в своем распоряжение базу данных Oracle Database полностью готовую для работы в качестве СУБД под управлением 1С:Предприятия версии 8.
Пожалуйста, обратите внимание, что вышеприведенная инструкция приведена для простой конфигурации БД (режим некластерной БД, с отсутствием опции DataVault). Если используете кластерную БД или же используете опцию DataVault, то процедура установке патчей будет выглядеть сложнее, - в этом случае дополнительные шаги описаны в документации к патчам (файл README. From Oracle Database 12c Release 2 onwards there's a public API call to create SQL patches using DBMS_SQLDIAG. If you're using this release you should check out too.
Mohamed HourisOracle Notes
In the, I showed how you can use the BIND_AWARE hint to skip the monitoring phase of adaptive cursor sharing. If you have a packaged application, you might be wondering how you can use this hint if you can't edit a query directly. In this post I'll who you how to do just that, for any hint (or set of hints). In order to do this, we will create a SQL patch for a query. We haven't said much, if anything, about SQL patches here on the blog before. A SQL patch is a SQL manageability object that can be generated by the SQL Repair Advisor, in order to circumvent a plan which causes a failure. In essence, a SQL patch tells the optimizer to change the plan in some way or avoid an optimization so that the failure does not occur.
For instance, if a failure happens during index access, then generating a plan without that index (or without any index) may work around the failure.
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You can read more about this in the documentation. What we don't tell you in the documentation is that you can create your own SQL patch, which will tell the optimizer to use a set of hints when it optimizes a particular query. You can use this trick to essentially insert hints into a query whose text you cannot edit. You can do this with the function dbms_sqldiag_internal. This function lets you specify a query text and a set of hints to apply to the query. I'll start with an example using the same query from the BIND_AWARE hint post. Recall from the, we saw that if we ran the query without the BIND_AWARE hint, the first child cursor to be generated would not be bind aware.
Now let's create the patch for this query. The hint that we want to apply is simply "BIND_AWARE". And then see what happens when we run the original query, without the hint. I cleared the cursor cache before that last step, to make it easier to read. If I hadn't done that, you should still see a new cursor, due to. The BIND_AWARE hint is pretty simple, but you can use all kinds of hint text with this function. The hint text just needs to work at the top level of the query.
So, for instance, if you want to hint an access path inside of a view, you can use global query block names to do this. Let's say for some crazy reason you want to use an index instead. And we even include a note in the plan that tells you that the SQL patch was used. So now you have enough rope to hang yourself. As you may have noticed, we generally aren't proponents of hinting your queries; we've talked about some of the perils of hints here. But we know there are legitimate cases where you need to add hints, and now you can do this even with a packaged application in which you cannot edit the queries directly.
You can get a copy of the script I used to generate this post. Thanks for sharing, awesome tip, I did not find any option to pass as sqlid, might be difficult for long sqls with literals. Now, as you mentioned, the SQL Patch exists primarily for the SQL Repair Advisor. But here you have used it to inject some hints into an application much like you might use a SQL Plan Baseline. Are there any reasons why you would pick a SQL Patch over a baseline?
Thank you for sharing the usage of the procedure SYS. We tested the procedure and it works as expected. How have "SQL Patch" to interact with other STB object - SQL Plan Baseline? I mean, if I try to add some hints (using method described above) to a particular query with already allowed SQL Plan Baseline, have this to modify or to disallow the existent Baseline? And if we add some access path hints to query, have this to prevent the execution plan evolution by Cardinality Feedback / Adaptive Cursor Sharing technologies?
Is that a free feature or does the use of the dbms_sqldiag_internal function require the diagnostic pack license? Is there a way to make it do force matching when literals are used rather than bind variables? I would also prefer an interface with SQL_Id, but a simple wrapper accessing the full SQL text in V$SQL via SQL_ID would do the job.
I found out the way using SQL patch to add hint text is bit different from adding hints into the SQLs themselves. 'full(t1)' will make a FTS against the table t1. However, if just simply put 'full(t1)' into the hint text parameter in I_CREATE_PATCH, it won't work though Oracle tell you the patch is being used. To make the patch work, 'full(@sel$1 t1)' must be placed instead. Name Please enter your name. Email Please provide a valid email address.
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If you’re a DBA, it’s likely that you’ve encountered systems where a lot of SQL statements have been hinted almost as a matter of policy. Perhaps you’d like to figure out if these hints are actually helping.
You might like to demonstrate to a development team that they should probably dial down their enthusiasm for micro-managing the Oracle Optimizer. Sometimes, you might want to apply a hints on-the-fly. A while ago, Maria Colgan wrote a couple of posts (and) on SQL Patch and how you can add hints to SQL in a packaged application. In other words you can apply hints to SQL statements without having to change any application code.
From Oracle Database 12c Release 2, the interface to SQL Patch is greatly improved and easier to use. In particular, it’s now part of the public API and the hint text is a CLOB (because VARCHAR2 can be too limiting if you want to specify a complete query outline). The API includes a new SQL_ID parameter too. Patch_name:= dbms_sqldiag. For the rest of this post I’ll use the new DBMS_SQLDIAG API, but everything here will work in Oracle Database 11g and Oracle Database 12c Release 1 if you use the internal DBMS_SQLDIAG API documented in.
Take a look at the following example. The query really should use indexes I1 and I2 on T1. V, but I’ve hinted it to use a FULL scan or T2.
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Select /* QUERY2 */ /*+ FULL(t2) */ sum(t1. If you create a SQL patch with an additional hint for a FULL scan on T1 (using the create_sql_patch example above) the new plan will include the FULL hints for both T1 and T2. SELECT * FROM table(DBMS_XPLAN. Hints specified using SQL patch must include query block names (such as @"SEL$1"). If you’ve not done this before it can appear quite difficult, but if you use example queries and display the SQL execution plans using the OUTLINE format (see above), it becomes pretty easy to figure out what you need to do.
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What if you want to disable hints for an individual SQL statement? Well, there’s a neat trick to do this. If you look closely, you’ll see it in the OUTLINE above. Patch_name:= dbms_sqldiag.
You can even disable all existing hints and supply new ones. In common with using hints in general, if you supply invalid hints via SQL patch then the effects can be confusing if you fail to notice your error – so take care. Patch #17203284 is currently available for Oracle Database 12. If you want to make the new public interface available in this release. There a way to find out what hints to apply? Is there an advisor, like SQL Tuning Advisor or a way to figure out which ones apply a patch for better performance?