Oracle products are extremely complex enterprise-class applications, where real world accessibility is achieved through correct configuration of many Oracle and third party components (application, server operating system, browser, and assistive technology, for example.) This matrix may at times result in defects at the time of release. In other cases we might include recently acquired applications that have not yet been fully evaluated for accessibility. You should read our ACRs carefully and assess the applicability of any defects or exceptions listed for your particular deployment; often customers only use a subset of any one product, so a known defect or exception may not be significant in that context.
However, Oracle does have a diagnostic event mechanism that can be used to give us more information whenever an ORA-1652 error occurs by causing Oracle server processes to write to a trace file. This trace file will contain a wealth of information, including the exact text of the SQL statement that was being processed at the time that the ORA-1652 error occurred. This diagnostic event imposes very little overhead on the system, because Oracle only writes information to the trace file when an ORA-1652 error occurs.
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If a SQL statement fails due to lack of space in the temporary tablespace and the ORA-1652 diagnostic event has been activated, then the Oracle server process that encountered the error will write a trace file to the directory specified by the user_dump_dest instance parameter. The entry in the instance alert log that indicates an ORA-1652 error occurred will also indicate that a trace file was written. An entry in the instance alert log will look like this:
Viewed 10K+ times! This question is You Asked 1)is it required that all the sql statements in my application (consisting of beans and servlets and jsp's) be followed by a commit statement...what happens if i donot give any commit after each sql statements? do they commit when the session ends..is there any feature where i can set the auto commit to true or false in the database server itself..how should it be actually?2)i have a schema with all tables with keys,views,sequences,triggers etc...i implement fine grained access control on this and my policy and context also exist in this schema(securitywise is it ok or should i keep the securrity policy in system)i have different users who use these table,views etc..For which objects should i create pvt. synonyms in those users/schemas and for which objects should i give grants?i understand that even if i create a sequence i have to give grant to the user..but for keys and indexes do i need to create sequences ?my understanding is i have to create synonymns for dblinks,functions,packages,procedures,sequences,tables,views,triggers and then give grants accordingly...did i miss out something?3)i am using multimaster replication for the above scenario, so what else do i need to take care of?.. like what are the objects for which i have to create snapshots and groups etc...regardsmuralidhar and Tom said...1) if you are using JDBC, it unfortunately "auto commits" after each and every statement. It doesn't do transactions. I believe the first line of code after connecting in JDBC should always be: conn.setAutoCommit (false);Here are the rules for when to commit:o you should commit as soon as you cano you should NEVER commit earlier then you should.You would only commit after each statement if in fact EACH statement was an entire transaction. If you were going an ATM transfer for example and needed to do the SQL: update accounts set balance = balance - 1000 where account_id = 123; update accounts set balance = balance + 1000 where account_id = 456;to transfer $1000 from savings into checking, you would NOT want to auto commit or commit at all between statements (what if the second update fails, you just "lost" $1,000). You would want to commit right after the transfer was complete in order to make the transaction "durable" -- permanent.You should ALWAYS commit explicitly and you should always commit when your business logic dictates it -- not after every statement, not relying on the database to do it when you log off (if you log off, Oracle will commit your work before it does so, yes)2) You only need to grant on the objects they will be accessing. If you grant execute on a procedure, they need NO grants on the tables the procedure accesses. If you grant select on a table, they need NO access to the indexes or constraints. Just the top level object is granted on.Synonyms are just aliases and have no privileges associated with them. You always need to grant on the objects to which they refer for them to work.You do not have to create synonyms at all, they are optional. You can use "alter session set current_schema=APPLICATION_SCHEMA" instead.3) I cannot answer that since I didn't write your application ;)If you are using MM replication -- you don't need to have snapshots and snapshot groups (those are different from Multi-Master).... Rating (34 ratings)Is this answer out of date? If it is, please let us know via a Comment Comments Comment Very helpful, and completeHarrison Picot, April 05, 2001 - 10:51 am UTC
Both of these procedures can also change the consumer group of any parallel execution server sessions associated with the coordinator session. The changes made by these procedures pertain to current sessions only; they are not persistent. They also do not change the initial consumer groups for users.
In the previous scenario, suppose that due to inactivity elsewhere, LOW_GROUP acquires 90% of CPU. Suppose that you do not want to allow LOW_GROUP to use 90% of the server because you do not want non-critical sessions to inundate the CPUs. The UTILIZATION_LIMIT attribute of resource plan directives can prevent this situation.
In the example described in Table 27-2, if HIGH_GROUP is using only 10% of the CPU at a given time, then the remaining 90% is available to LOW_GROUP and the consumer groups in MAINT_SUBPLAN at level 2. If LOW_GROUP uses only 20% of the CPU, then 70% can be allocated to MAINT_SUBPLAN. However, MAINT_SUBPLAN has a UTILIZATION_LIMIT of 50%. Therefore, even though more CPU resources are available, the server cannot allocate more than 50% of the CPU to the consumer groups that belong to the subplan MAINT_SUBPLAN.
Use the PARALLEL_SERVER_LIMIT directive attribute to specify the maximum percentage of the parallel execution server pool that a particular consumer group can use. The number of parallel execution servers used by a particular consumer group is counted as the sum of the parallel execution servers used by all sessions in that consumer group.
It is possible for a single consumer group to launch enough parallel statements to use all of the available parallel execution servers. If this happens when a high-priority parallel statement from a different consumer group is run, then no parallel execution servers are available to allocate to this group. You can avoid such a scenario by limiting the number of parallel execution servers that can be used by a particular consumer group. You can also set the directive PARALLEL_STMT_CRITICAL to BYPASS_QUEUE for the high-priority consumer group so that parallel statements from the consumer group bypass the parallel statement queue.
For example, assume that the total number of parallel execution servers is 32, as set by the PARALLEL_SERVERS_TARGET initialization parameter, and the PARALLEL_SERVER_LIMIT directive attribute for the consumer group MY_GROUP is set to 50%. This consumer group can use a maximum of 50% of 32, or 16 parallel execution servers.
In the case of an Oracle Real Application Clusters (Oracle RAC) environment, the target number of parallel execution servers is the sum of (PARALLEL_SERVER_LIMIT * PARALLEL_SERVERS_TARGET / 100) across all Oracle RAC instances. If a consumer group is using the number of parallel execution servers computed above or more, then it has exceeded its limit, and its parallel statements will be queued.
The number of active parallel execution servers across all consumer groups exceeds the PARALLEL_SERVERS_TARGET initialization parameter setting. This condition applies regardless of whether you specify PARALLEL_SERVER_LIMIT. If PARALLEL_SERVER_LIMIT is not specified, then it defaults to 100%.
The sum of the number of active parallel execution servers for the consumer group and the degree of parallelism of the parallel statement exceeds the target number of active parallel execution servers.
Although parallel execution server usage is monitored for all sessions, the parallel execution server directive attributes you set affect only sessions for which parallel statement queuing is enabled (PARALLEL_DEGREE_POLICY is set to AUTO). If a session has the PARALLEL_DEGREE_POLICY set to MANUAL, parallel statements from this session are not queued. However, any parallel execution servers used by such sessions are included in the count that is used to determine the limit for PARALLEL_SERVER_LIMIT. Even if this limit is exceeded, parallel statements from this session are not queued.
Specifies the maximum percentage of the parallel execution server pool that a particular consumer group can use. The number of parallel execution servers used by a particular consumer group is counted as the sum of the parallel execution servers used by all sessions in that consumer group.
Table 27-4 describes the resource allocations of the plan DW_PLAN, which can be used to manage the needs of the data warehouse users. This plan contains the consumer groups URGENT_GROUP, ETL_GROUP, and OTHER_GROUPS. This example demonstrates the use of directive attributes in ensuring that one application or consumer group does not use all the available parallel execution servers. 2ff7e9595c
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