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incomplete. * It is best to use the official Oracle sqlplus tool, which has the best performance and is convenient and intuitive. The following describes two ways to view execution plans (and the simplest two ways) Some knowledge about the execution plan:* Full Table Scans Full Table scan * Rowid Scans rowid scan * Index Scans Index scan * Index Unique Scans * Index Range Scans Descending * Index Skip S
The Oracle tutorial you are looking at is: Oracle performance optimization. Linux Journal published an article that optimizes the Oracle database and feels very useful. Briefly introduce its summary and everyone to share Linux in enterprise database applications.Currently, HP,COMPAQ,DELL,IBM and
The ORACLE tutorial is: Oracle SQL Performance Optimization Series 2.4. Select the most efficient table name sequence (only valid in the rule-based Optimizer)The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. Therefore, the table written in the FROM clause (basic table drivi
the order by it is possible to physical reads more but consistent gets less. But this is not the reason why I am here, because I have no physical reads in this experiment. The impact of ArraySize. ArraySize refers to the number of rows that are read at a time when data is being read. This value defaults to 15 and can be viewed using the show ArraySize command. A data block for example, there are 100 records, then not read this block can fetch all the data once, take arraysize=15 as an examp
The following articles mainly talk about Oracle Performance Check SQL statements. On a website with good reputation, I found a reference to Oracle Performance Check SQL statements and related code examples, to share with you. The following is a detailed description of the article.
How to get Oracle experiment to improve performance when not experimenting--win7 exampleModel: ThinkPad E431System: WIN7The experiment uses a notebook when the database is not used. It is recommended that you shut down Oracle so that it frees up the resources it consumes.Oracle Software is very resource-intensive, and if the
Download the jdbc database driver package for Oracle. Pay attention to the version of the Oracle database. Here we use: OracleDatabase11gEnterpriseEditionRelease11.2. Download the jdbc Database driver package for Oracle. Pay attention to the version of the Oracle Database. Here we use:
are a total of 11 namespaces in the database cache. We can basically say that there are 11 types of information in the database cache. A very important indicator is the library cache hit rate, which is the GETHITRAIO of all objects in the library cache. The calculation method is as follows:Select 1-sum (gethits)/sum (gets) from v $ librarycache;This ratio should be above 90%. Another important factor is the ratio of Reload to Pin, which should be less than 1%.If the ratio is not reached, the so
execution of SQL. As you can see, the process of parsing is a very resource-intensive process. Therefore, Oracle in the process of parsing user-submitted SQL statements, if each occurrence of the new SQL statements in accordance with the standard process complete analysis of the whole, the efficiency is too low, especially with the increase in the number of concurrent users, the increase in data volume, the overall
The ORACLE tutorial is: Oracle-based high-performance dynamic SQL program development. Abstract: This article summarizes the development of dynamic SQL programs and provides several development skills based on the actual development experience of the author.Keywords: dynamic SQL, PL/SQL, high performance1. Static SQL and dynamic SQLOracle compiler PL/SQL program
Q: What are the initialization parameters related to Oracle performance?A: The initialization parameters that affect Oracle system performance are as follows: SGA (system global zone)The system global zone (SGA) is a memory segment allocated to the database containing an Oracle
Some time ago in a migration of data pump and exp, found that the difference in efficiency is quite large. Here is an example of a simple comparison. This article discusses the effect of parallelism on the export of data pumps. Write a few articles before the data pump also know not much, recently read the document found that the parallel settings are also skilled, if set reasonable, you can significantly improve the performance of the export. Firs
Tags: Oracle performance databaseWhen Oracle queries come with efficiency issues, we often need to understand the problem so that we can solve the problem. Oracle provides trace information for SQL execution, which contains textual information about SQL statements, some execution statistics, waiting during processing,
The Oracle tutorial is: Oracle-based high-performance dynamic SQL Program Development. Abstract: This article summarizes the development of dynamic SQL programs and provides several development skills based on the actual development experience of the author. Keywords: dynamic SQL, PL/SQL, high performance 1. Stat
time required for recovery and reduces the performance of the system during running. LGWR writes logs to each log group cyclically. When a log group is full, the oracle server must perform a Checkpoint, which means: DBWn writes all or part of the dirty data blocks covered by the corresponding log into the data file; CKPT updates the data file header and control file. If DBWn does not complete the operation
Oracle performance analysis tool statpackThe installation and usage are what we will introduce in this article. Through Statspack, we can easily determine the bottleneck of the Oracle database and record the database performance status, remote technical support staff can also quickly learn the running status of your da
Common Oracle performance-related scripts (SQL) are used in the absence of visual tools to monitor database performance, the following provides several scripts related to Oracle performance for your reference. The following scripts are successfully tested in
According to the description in OracleDocument, v $ sysstat stores the resource usage of the entire instance (instance-wide) from the moment the database instance runs. Similar to v $ s According to the description in OracleDocument, v $ sysstat stores the resource usage of the entire instance (instance-wide) from the moment the database instance runs. Similar to v $ s Oracle learning Dynamic Performance
Oracle is a large database with a C/SClient/Server structure. It is mainly used in the 4GLSQL language and has the advantages of being powerful, simple, and easy to learn. The working process of the C/S structure is: when the client c end) inputs and sends an SQL statement, it will be sent to the server S end through the network ), the result is analyzed and executed, and then returned to the client through the network. At this time, the client can se
AWR (Automatic Workload Repository) is a new tool provided by Oracle 10 Gb to collect database statistics. It mainly includes the AWR memory area, historical data storage files, ASH and other components. The main content of the AWR report includes the following parts: Preface:This is the first section of the AWR report, which describes the environment, including the database name, database version, whether it is a RAC node, and the collection time of
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