Oracle result cache not working. Symptoms On : 12.

Oracle result cache not working. 8. If another query can use those results, then all database processing for that query is eliminated. Sep 13, 2014 · Result Cache is used as a buffer in SGA for keeping the most recent result of the queries when they fetch again by user then it return result directly from Result cache buffer area. Symptoms On : 12. 2 and later: Active Data Guard (ADG) RESULT_CACHE Query Hint Not Working On Primary After Switchover Jun 23, 2015 · Hi, I'm using the Oracle 12 manged ODP. and if i use the result_cache_mode=force then the result cache is being used. Home » RDBMS Server » Performance Tuning » Oracle 11g r2 result_cache is Not working (linux centos 5 ) Show: Today's Messages:: Polls:: Message Navigator E-mail to friend Oracle 11g r2 result_cache is Not working [message #480500] Mon, 25 October 2010 05:45 oravijay Messages: 43 Registered: March 2010 Member Hi Oracle Experts, Jun 13, 2016 · The materialize hint forces Oracle Database to process and store the results of the query. And then, of course, there are the other key advantages of the function result cache: automatic invalidation of cache contents when a dependent table is changed, the fact that the cache is shared across sessions, and the application of the least recently used algorithm to the memory in the cache. 0 version, Service Bus cache validation script is not working for 12c. I'm using the jdbc drivers from 11. Enabling the result cache in such a broad-based manner can also impact performance in mixed workload environments, where the same tables are continuously updated and retrieved. no rows selected sokrates > Why doesn't client result cache work here ? How can I see "0 SQL*Net roundtrips to/from client" ? Or is this feature not supported by sqlplus ? note: I have OCI_RESULT_CACHE_MAX_SIZE=1G OCI_RESULT_CACHE_MAX_RSET_SIZE=10M OCI_RESULT_CACHE_MAX_RSET_ROWS=20M in my client-sqlnet. I am getting the below exception while OSB managed server start u Result Cache enables caching SQL query and PL/SQL function results to be stored in memory. Jul 20, 2024 · Oracle Database - Enterprise Edition - Version 19. Sep 9, 2024 · Trying to set result_cache_max_size parameter and no success with that, the parameter is still = 0 Restarting the instance after making changes to result_cache_max_size does not help. Feb 24, 2025 · The result_cache hint did not produce the expected result cache operation in one specific SQL statement, for example. Does oracle automatically flush/age out RESULT CACHE memory as it would do other SGA areas? Meaning if the result cache size When a PL/SQL function has the RESULT_CACHE option, its results are cached so sessions can reuse these results when available. You can get this by doing something like: set serveroutput off select /*+ result_cache */ * from <your query>; select * from dbms_xplan. 0 on Windows. 0. This technique can be especially effective for SQL queries and PL/SQL functions that are executed frequently. Sep 1, 2007 · The PL/SQL function result cache minimizes the amount of memory needed to cache and share this data across all sessions. Mar 6, 2025 · When trying to use result cache by setting the parameter result_cache_max_size and explicitly using the result_cache hint in a query, the result cache is not being used as per the explain plan output. 6 and later: Result Cache Does not Work After Switching From Standby Back to Active Database Purpose This tutorial describes how Result Cache improves query execution time and application performance in Oracle Database 11g. is the result cache feature is work same as qsel. When a PL/SQL function has the RESULT_CACHE option, its results are cached in the shared global area (SGA) so sessions connected to the same instance can reuse these results when available. Jul 12, 2023 · Home » RDBMS Server » Performance Tuning » Oracle 11g r2 result_cache is Not working (linux centos 5 ) Show: Today's Messages:: Polls:: Message Navigator E-mail to friend Oracle 11g r2 result_cache is Not working [message #480500] Mon, 25 October 2010 05:45 oravijay Messages: 43 Registered: March 2010 Member Hi Oracle Experts, Mar 7, 2011 · I am using Oracle Database 11g Release 11. So Why Should You Care Now? A result cache is an area of memory, either in the Shared Global Area (SGA) or client application memory, that stores the results of a database query or query block for reuse. 0 and later: Result Cache Fails To Start May 26, 2025 · In 11. display_cursor( format => 'BASIC LAST +HINT_REPORT'); At the bottom of the plan im using below query using hint rsult_cache but its not using. The DBMS_RESULT_CACHE package defines several constants for specifying parameter values. Oracle Database Jan 28, 2014 · This way Oracle will cache the results of your function, not only for you session, but across sessions. 3 cache invalidation capabilities does not work 308ce45e-8c6a-4f39-95a2-1f9abcb780b1 Nov 11 2014 — edited Nov 11 2014 I am dealing with a situation where ,overnight, a series of batch processes update database tables, leaving my Toplink cache with potentially hundreds of stale objects. Added the same parameters for OSB Weblogic server startup. Aug 4, 2018 · Oracle Database - Enterprise Edition - Version 12. Another great thing about this is when your function is dependent on a database table and the underlying data changes (either in your session or in another session) then the cache will be invalidated and it will be repopulated. put_line( 'Called' ); RETURN 0; My example prints Called every time, though. If the information is not present, it will cache the results of the query provided there is enough room in the result cache. You can use OCI to access Oracle TimesTen In-Memory Database and Oracle TimesTen Application-Tier Database Cache. Mar 25, 2021 · and see a non-zero value for row_count. Note that resultset caching over inCache functions independently of page and asset caching over inCache. 4 and later Information in this document applies to any platform. 1) Last updated on JULY 20, 2024 Applies to: Oracle Database - Enterprise Edition - Version 11. Environment: Oracle 18c XE Params: result_cache_mode MANUAL result_cache_max_size 8060928 result_cache_max_result 5 result_cache_remote_expiration 0 I think that row_count equal to non-zero is very significant to make me believe that RESULT_CACHE is works. On production, result cache is working fine, in development it is not. The cached rows are shared across SQL statements and sessions unless they become stale. Using /*+ RESULT_CACHE */ hint explicitly for the SQL statements involved in the PL/SQL function does workaround the problem. However, when running reports in OBIEE, it's clear that the cache is being used. Jul 20, 2024 · Result_cache is Disabled with Active Dataguard (Doc ID 2494295. I'd have thought if the query was cached in the client it wouldn't show. Oracle Database automatically detects all data sources (tables and views) that are queried while a result-cached function is running. Feb 7, 2012 · The result cache is not being used or the results of the SQL statements are not being cached at all despite using the result_cache hint and the table being not used at all. May 10, 2025 · Result Cache does not work. With Oracle Database Cache, your applications can process several times as many requests as their original capacity. I've tested this from different sessions as well, we can see result_cache inside the execution plan. Symptoms Result_cache is not enabled even through all of the parameters are set and have not changed: Even setting result_cache_mode=FORCE as dynamic SQL inside PL/SQL function does not use result cache. The Result Cache came with the Oracle Database 11g Release 1 version and is enabled by default. May 27, 2019 · Cache Issues With BI Report Data (Doc ID 1636628. I had a small discussion with a colleague about FRC, so I jotted down a few pros and cons for using it. e you've only cached the 1s May 6, 2013 · I'm trying to use Oracle's Function Result Cache on 11. SQL> connect scott/<PASSWORD> Connected. Oracle Database Cache caches and manages data in entities called data sets. For more information about the inCache framework, its caching models, and system tools, see Working with Cache Management - Resultset Cache in Administering Oracle WebCenter Sites. A result cache is an area of memory, either in the Shared Global Area (SGA) or client application memory, that stores the results of a database query or query block for reuse. Oracle Database - Enterprise Edition - Version 11. I have made the below configuration changes 1. Jan 23, 2016 · Hi All,I had configured external coherence server and added it in WKA list. We can see that it returned 71 rows and took 5 seconds to execute. RESULT_CACHE. My question is, does result caching work for determi The DBMS_RESULT_CACHE package provides an interface to allow the DBA to administer that part of the shared pool that is used by the SQL result cache and the PL/SQL function result cache. This low memory profile, plus the automatic purge of cached results whenever changes are committed, makes this feature of Oracle Database 11g very practical for optimizing performance in PL/SQL applications. 0 and trying to enable the oci client cache. Nov 9, 2015 · Hi- My general understanding of function using result_cache is that if the underlying data has changed, the function knows to self-invalidate the cached result. Added RESULT_CACHE compiles OK, but when I put debugging statements in my code they are executed when I call the functions with identical parameters. Jul 27, 2017 · In Oracle Enterprise manager, we have "Enable cache" unchecked. 0 and later: result_cache_max_size is Not Increased Over Certain Size Nov 11, 2014 · 10. The data results are not correct. Does any one have good expereince using it. Client result caching stores the results of the When a PL/SQL function has the RESULT_CACHE option, its results are cached in the shared global area (SGA) so sessions connected to the same instance can reuse these results when available. This means that different queries can take advantage of the same cache. Oct 16, 2022 · DETERMINISTIC and RESULT_CACHE PL/SQL functions Recent events here in the UK have once again emphasised the value of being careful with your “cache”. com. To understand what's going on, look at the hint report in the plan. 2 and later: Active Data Guard (ADG) RESULT_CACHE Query Hint Not Working On Primary After Switchover Sep 2, 2025 · Additionally, there is no method for properly updating Presentation Server cache to properly display results even if server cache was updated, still resulting in stale data to return from a dashboard prompt. RESULT_CACHE To make a function result-cached, include the RESULT_CACHE clause in the function definition. The query is routed to the middle-tier cache, which returns the data quickly. It isn't working. Taking into account that the cache is invalidated when the The DBMS_RESULT_CACHE package provides an interface to allow the DBA to administer that part of the shared pool that is used by the SQL result cache and the PL/SQL function result cache. ora (is this even needed for client result Jan 25, 2016 · Using the RESULT_CACHE hint, we have instructed Oracle to cache the results of this aggregate query. How Does Oracle Database Cache Work? Oracle Database Cache provides a middle-tier cache for storing data and an easy-to-use management interface for managing the Oracle Database Cache environment. How can I Mar 10, 2025 · Information in this document applies to any platform. Apr 8, 2002 · For appeals, questions and feedback about Oracle Forums, please email oracle-forums-moderators_us@oracle. This section describes the two types of result cache and contains the following topics: Server Result Cache Concepts Client Result The AskTOM team is taking a break over the holiday season, so we're not taking questions or responding to comments, but we might still sneak in a few Office Hours sessions! Thanks for being a member of the AskTOM community. As soon as we manually clear the cache, the results are correct. Feb 29, 2008 · For appeals, questions and feedback about Oracle Forums, please email oracle-forums-moderators_us@oracle. It is important to be aware that this is accomplished by using a client-side memory cache to store rows of a scrollable result set. All you have to do is add the RESULT_CACHE option to the function declaration section and that’s it. 0 against DB 11. The FORCE and FORCE_TEMP modes are not generally recommended because queries that call non-deterministic PL/SQL functions are cached, potentially causing material changes to the results. " I've read from many other online sources that it does not work and is not supported by Oracle. This can greatly improve performance, but it can also lead to performance problems. Mar 7, 2011 · I am using Oracle Database 11g Release 11. 1 that states the following: "When set to AUTO, the optimizer determines which results are to be stored in the cache based on repetitive executions. Still doesn't work. Customer configured Out-of-Process Coherence Cache Server. . The DBMS_RESULT_CACHE package provides an interface to allow the DBA to administer that part of the shared pool that is used by the SQL result cache and the PL/SQL function result cache. What about few app side queries? Apr 27, 2012 · Hi All, I am on 11. 2, use of the SQL Query Result Cache is enabled on a query, either directly through the /*+ RESULT_CACHE */ hint, or indirectly through table annotations or by using the result_cache_mode=FORCE parameter setting. But the problem is the datbaase crashes. We can learn the Result Cache status with the following query. 4. The RESULT_CACHE clause will ensure that the function and result will be stored in the cache. Mar 25, 2011 · Is any one here familiar with using result cache. I've enabled the parameter and restarted my db, but my queries still show up in Enterprise manager's graphs and in the AWR report. SELECT * FROM (SELECT /*+ result_cache */ ObjectId_194 ObjectId, TypeId_194 TypeId, field_356, field_388, Typ Purpose This tutorial describes how Result Cache improves query execution time and application performance in Oracle Database 11g. So, I thought I'd try the client results cache. there is view in this query. This can result in dramatic improvements in the average query response time. e. dbms_output. Though they are able to see the size, they are unable to list it. Using the PL/SQL Function Results Cache can lead to a huge boost in response time / performance of PL/SQL functions. I am not able to find anything regarding i This article presents a number of solutions for making calls to PL/SQL functions from SQL more efficient. 7. But if we have different sort of values passed to the same query then it's not working I guess. If you declare the function before defining it, you must also include the RESULT_CACHE option in the function declaration. When changing the result_cache_max_size parameter and restarting the database, the value of the parameter is still 0 which means that Result Cache is disabled: Sep 10, 2015 · You should add the result_cache clause to your function in order to cache the output of the function. I think I followed the documentation pr Oct 31, 2015 · @McGlothlin It's important to note that Oracle does not cache the query results, it caches the most frequently used table and index blocks. However, it will provide very serious gains in small tables which are constantly accessed. after it reaches some memory limit. In addition, you do not need to modify your existing applications to use Oracle Database Cache. It is shared by all sessions (i. Enabled the client result set cache by s This feature lets you easily cache commonly calculated function results. Subsequent executions of the same query or function can be served directly out of the cache, improving response times. Because the underlying server does not support scrollable cursors, Oracle JDBC must implement scrollability in a separate layer. This chapter contains the following topics: Only database administrators should be granted the EXECUTE privilege for this package. Jan 10, 2022 · You Asked hi tom i have a simple question about result cache. Is there a way to flush them, too? This is important for a tuning excercise where several methods are tried one after the other, but we would like to reduce the effect of a pre-existing block in the buffer To make a function result-cached, include the RESULT_CACHE clause in the function definition. ora (is this even needed for client result Dec 24, 2014 · Now we have result_cache feature available, which is very useful. One good thing about result cahce i found it does improve performance. With query caching, Oracle Analytics Cloud stores the precomputed results of queries in a local cache. 1) Last updated on MAY 27, 2019 Applies to: Oracle Fusion Performance Management Cloud Service - Version 11. Jun 29, 2011 · Is AUTO a supported option for result_cache_mode in 11g? I have an Oracle University 11g New Features guide for 11. It couldn’t be much easier! The function result cache is ideal for data from tables Aug 15, 2024 · Benefits of Oracle Database Client Result Caching in the Niles benchmark How does Client Result Caching work? Oracle Client libraries manage a result cache for each client process. Specifically we’ll look at a simple deterministic Jan 15, 2020 · The Result Cache is a feature in Oracle 11g and later versions that allow the database to store the results of frequently executed queries in memory, in order to improve performance by avoiding the need to re-execute the same query multiple times. We don't want the data to cache. Feb 11, 2016 · RESULT_CACHE If I have RESULT CACHE memory set at 200MB, and I am using RESULT CACHE keyword when I create functions in my package that I expect to use in some of the SQL batch programs. 2 in Linux. connections) inside that process. The alter table syntax only provides the result cache at a table level, i. ? When a PL/SQL function has the RESULT_CACHE option, its results are cached in the shared global area (SGA) so sessions connected to the same instance can reuse these results when available. 2. Thank you! Interested in getting your voice heard by members of the Developer Marketing team at Oracle? Check out this post for AppDev or this post for AI focus group information. 1. 0 and later Information in this document applies to any platform. To this end, I’m going to take a look at how PL/SQL functions defined using the DETERMINISTIC or RESULT_CACHE keywords use cache values. The Jul 27, 2017 · In Oracle Enterprise manager, we have "Enable cache" unchecked. We want global caching turned off. When a query is executed, the database first checks the Result Cache to see if the results of the query have already been stored there. If changes to any of these data sources are committed, the cached result becomes invalid across all instances. What is the official Oracle corp A result cache is an area of memory, either in the Shared Global Area (SGA) or client application memory, that stores the results of a database query or query block for reuse. I recently switched on the results cache with great effect. how exactly does the oracle access the result cache? and how does it knew that it is the same sql statement executed last time? Aug 16, 2024 · Oracle Service Bus - Version 12. FLUSH flushes both all the cached results for SQL queries and all the cached results for PL/SQL functions. This section describes the two types of result cache and contains the following topics: Server Result Cache Concepts Client Result Mar 22, 2023 · Oracle Database - Enterprise Edition - Version 12. Jan 20, 2003 · How to flush the db buffer cache Tom,ALTER SYSTEM FLUSH SHARED_POOL flushes the shared pool entries, not the block buffers. It offers the benefits of just-in-time package-level caching (and more!) but without the hassle. The configuration changes I made to enable it are - Enabled the client result set cac Dec 13, 2016 · Is there a way to force the result cache for ANY query and let the application handle invalidation? In an extreme (not very wise) case, do this: select /*+ force_result_cache */ * from dba_tables where table = 'XXX'; Basically, we want to cache complex queries (involving multi-level views, sysdate, 'connect by level <= x' row generator, etc) and let the app invalidate when necessary. Nov 11, 2024 · That's a complex query with lots of hints in! I don't know why it's not using the result cache in this example. If they have Jul 24, 2015 · Hi All,I am trying to implement cache mechanism in OSB through business service it not working as expected. Proxy1---->BusinessService--->Proxy2Below are the Bus May 28, 2013 · If we use result_cache_mode=force in oracle 11gr2 database then we don't need QSEl (third party software). The cache can be enabled, and its size specified, with a database initialization parameter. Aug 2, 2019 · I have two database instances, development and production that are fairly identical. Because the RESULT_CACHE hint is specified only in the inner block, the results of the inner query are stored in the server result cache, but the results of the outer query are not cached. 1. Adding the RESULT_CACHE hint to the query tells the server to attempt to retrieve the information from the result cache. SQL> set autotrace traceonly SQL> select /*+ result_cache */ deptno, avg(sal) 2 from emp 3 where hiredate > sysdate 4 group by deptno; no rows selected Jan 22, 2019 · Using for large tables may cause a problem. I want to use Oracle's result cache to cache results of (user defined) functions, which we use in SELECT commands. May 31, 2023 · Use function result cache, yes or no?Oracles function result cache (FRC) works, in simplified terms, by caching the result of a PL/SQL function. However, when running FORCE mode is not generally recommended because queries that call non-deterministic PL/SQL functions are cached, potentially causing material changes to the results. Apr 3, 2010 · Hello, I just finished installing Oracle 11g Enterprise Edition on my laptop,under windows XP 32 Bit, Just run to test the result cache ,It seems the result cache does not work for me ; Please see th Demonstration of Function Result Cache Script Name Demonstration of Function Result Cache Description The Function Result Cache is a fantastic feature added in Oracle Database 11g, which allows you to avoid unnecessary function execution, especially when fetching data that is static. Goal While validating custom reports developed in BI, because of the page and form data remains in the disk cache there is a mismatch found in report data and contents 2 How can I tell if my database has RESULT_CACHE setup? I am not a dba, but am trying to utilize this feature in my functions. I am using the Enterprise Version of Oracle 19. Can any one please explain this behavior. The RESULT_CACHE Option ¶ As of Oracle Database 11g, the function result cache has entered the caching fray. The result will be retrieved from cache if invoked with the same parameter for a second time. Technical questions should be asked in the appropriate category. They are trying to see the content of the Resultcache using a script. I also tried some other examples found online, but the cache is not used. This section describes the two types of result cache and contains the following topics: Server Result Cache Concepts Client Result Apr 7, 2021 · Oracle Database Cache improves the scalability and performance of applications that access Oracle databases by caching frequently used data on a middle-tier system. The value for the database parameter Jun 1, 2011 · A solution in cases where things like result caches and materialized views won't work because of invalidations or too much overhead is the Oracle In-Memory Database Cache option. This chapter describes topics about OCI performance features. how exactly does the oracle access the result cache? and how does it knew that it is the same sql statement executed last time? When a PL/SQL function has the RESULT_CACHE option, its results are cached in the shared global area (SGA) so sessions connected to the same instance can reuse these results when available. Please provide if i miss anything. 0, so I did the following test: RETURN NUMBER. This can be useful if the query is expensive and you refer to it many times. Oct 21, 2008 · I'm trying to use the implicit connection cache, and it doesn't seem to be working. net client connected to a 11gR2 db. zfmb 2s9ff 4gn bzfmyt ds q8 kuh7p za7zk bzann azl