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Part 4 Performance Adjustment[Q] If you set Automatic Tracing[A] log on to the system and run $ ORACLE_HOME/rdbms/admin/utlxplan. run $ ORACLE_HOME/sqlplus/admin/plustrce to create the SQL schedule. SQL creates a plustrace role. If you want to use a schedule for every user, SQL> create public synonym plan_table for pla
I hope to make a comprehensive summary of my recent work needs.SQL ServerPrecautions for database performance optimization: I searched the internet and found manyArticleSome of them list hundreds of entries, but you can see that there are a lot of seemingly incorrect or outdated information (which may be applicable to versions earlier than SQL server6.5 or Oracle
memory segment size to fully meet current needs TimeSlice Because the bottleneck of the system is mainly reflected in the disk I/O, so reduce the size of the time slice, on the one hand, because the disk I/O is not smooth caused by the CPU waiting, so as to improve the overall utilization of the CPU. On the other hand, the blocking amount of the process is reduced. Unlockable_mem Increase the size of the lock memory, so that can be used for paging and exchange of memory space to expand to meet
A well-designed, performance-capable database engine can easily serve thousands of users at the same time. And the "weak" database system with more users to access the system will greatly reduce its performance. In the worst case, it could even cause the system to crash. Of course, parallel access is the most important problem in any database solution, and various kinds of database systems are proposed in o
ArticleDirectory Ten experience in SQL Performance Optimization Master explain SQL Performance Optimization ten experience http://database.51cto.com Adair cnblogs I want to comment ( 1 ) Abstract:These 10 pieces of experience are the results of the author's own summary.Code. I hope this article wil
" includes the code running times, running time, average running time, maximum running time, and minimum running time. 2. Use DBMS_PROFILER to analyze PLSQL Performance The performance analysis process with it is like this: install DBMS_PROFILER package -- initialize the record table -- open the analysis switch -- run your PLSQL -- go to the analysis table and locate the bottleneck -- to solve it. The follo
your database's SORT_AREA_SIZE is well configured, you can also consider using UNION, MINUS, and INTERSECT. After all, they are highly readable.6. Use Where to replace Having (if possible)Optimize group:To improve the efficiency of the group by statement, you can filter out unnecessary records before group by. The following two queries return the same results, but the second query is much faster.The Code is as follows:Inefficiency:Select job, AVG (SAL)From emp group job having job = 'President
BKJIA database channel recommends the Oracle database debugging and performance optimization topic for you to better understand this article. The basic Oracle performance optimization methods include: 1) set up reasonable Oracle performa
ORACLE Database Performance Optimization-) memory disk1. Memory Structure Optimization Overview 1.1 buffer zone Buffer zones that affect database performance include SGA that can be shared and pga that are private to server processes, sga also includes the Shared Pool, large pool, java pool, data buffer, stream pool, and redo log buffer.1.2 Automatic Memory Manag
change the original table to the online table has been modified failed. After you temporarily disable SQL Server account, you can modify the name of the table.Analysis: There is a schema-stable lock during SQL execution, and it is easy to modify the data structure failure for highly concurrent access tables. It is recommended that you temporarily stop the business or disable the
contain Bush in the employee table. The following SQL statement can be used: Select * from employee where last_name like '% Bush % '; Here, because the wildcard (%) appears at the beginning of the search term, the Oracle system does not use the last_name index. This situation may not be avoided in many cases, but it must be well understood. Using wildcard characters will reduce the query speed. However, wh
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, espec
with delete can have a certain effect on the performance of the stored procedure. Because delete takes a full table-by-scan approach, it is a transactional operation that is counted into the SQL Server transaction log. Not only increases the running time, but also writes log files frequently, which causes the log file to be too large and consumes disk space excessively. Therefore, you can use the truncate
It was freezing, and I stayed at home and read "Mastering Oracle SQL" 2nd. I found that Oracle is still very powerful, and there are two hundred optical functions. It is difficult to simulate the Object-Oriented Query languages, in particular, Windows functions for OLAP in sql2003.Fortunately, hibernate3.0 also supports SQL
The following article mainly describes how to obtain the Oracle System Performance Statistics. Many people have asked me questions about Oracle performance. For example, what is slow performance? How to correctly quantify performance
1.1 Partitioned Tables Partition tableIn Oracle, if you encounter a particularly large table, you can use partitioned tables to change the performance of their applications.1.1.1 Partition Table Establishment:A company generates huge sales records each year, and the DBA suggests to the company that quarterly data be placed in a single partition, and the following is a demonstration of the company's 1999 dat
Branch of the database performance problems, help to help diagnose. The database is a Oracle10.2.0.3 RAC environment, but is now in a single node working state. The current problem is that page access is slow and no further information is available. According to the description, the landing server first checked the system's health by using top, and found that the system was not very busy: bash-3.00$/usr/local/bin/top Load averages:1.76, 1.63, 1.59
) from v $ librarycache; Reloads/pins> 1% has two possibilities: insufficient library cache space and invalid objects referenced in SQL. 3. The shared pool reserved size is generally 10% of the shared pool size and cannot exceed 50%. The request misses in V $ shared_pool_reserved is 0 or does not continue to grow, or the free_memory is greater than 50% of the shared pool reserved size, which indicates that the shared pool reserved size is too large
oracle| Performance | execution The cost of using the Oracle execution planning mechanism to improve query performance the time of the new SQL statement is the most important part of the Oracle
higher." ”Personal opinion: "The search efficiency is obviously higher in a relatively small field" is obviously right, but the length of the field does not seem to be determined by the variable length, but by the business itself. In SQLSERVER6.5 or previous versions, long-range string fields are slower to compare faster than fixed-length string fields, so for those versions, we recommend using fixed-length fields to store some key fields. In the 2000 version, modified the variable length of th
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