oracle sql tuning advisor

Oracle Adjusts Oracle's competition One of the benefits of Oracle is that it manages the free space in each table space. Oracle handles the space management of tables and indexes so that we don't have to understand the internal workings of Oracle's tables and indexes. However, for an experienced Oracle

Tags: managing tuning direction Cache ACK Analysis binding shared pool SQLAnalysis of effective cursor management"Thinking Analysis"The ability to interpret cursors as shared run schedules when SQL is not shared. There are two directions to the conventional approach:1. Adjust the size of the shared pool (shared operation plan in the library buffer of the shared pool);2,

Tags: max des from work query optimization select Run ASE Query1. Import trace files, such as duration >5000ms, collected by SQL Server profile into the sample table analysis or with the query optimizer advisor 2. You can use the DMV dynamic management view to query analysis SQL Server performance, usage, such as querying the last 50 most time-consuming

oracle| Data | database | Performance Oracle is a high-performance database software. The user can adjust the parameters to achieve the optimization of performance. Performance optimization is mainly divided into two parts: first, the database administrator through the adjustment of system parameters to achieve the goal of optimization, the second is the development of the application of the optimization to

for media recovery.D.unused indicates that the log was never written, could have just been added, or was reset after resetlogs.6. Delete the old log groupsql> ALTER DATABASE drop logfile Group 1;sql> ALTER DATABASE drop logfile Group 2;sql> ALTER DATABASE drop logfile Group 3;7. Delete the Redolog log file under the operating systemMV/U01/ORACLE/ORADATA/ORCL/RED

1 exp Tuning 1.1 Use direct and recordlength options The direct parameter defines whether to use direct path (direct = y) or conventional path (direct = n) for export ). Conventional path export uses the SQL SELECT statement to extract data from the table. direct path export reads data directly from the disk to the PGA and writes the data to the export file as is, this avoids the data conversion process

nothing is perfect.The cost of the Begin Tran is that all the resources locked by the SQL statements cannot be released until the commit is committed before committing.It can be seen that if the BEGIN TRAN too many SQL statements, the performance of the database is poor. Before this large transaction commits, it is bound to block other statements, resulting in many blocks.The principle of the BEGIN Tran is

Tags: service simulation datapump tuning Management production practical fail controlOne: Download routeSecond: The book DrawingThree: the book catalogue The 1th chapter of database operation and maintenance1th. Database Installation Configuration1.1 Preparation for pre-installation 11.2 Installing database Software 51.2.1 Method 1:oui Installation 61.2.2 Method 2: Silent installation 81.2.3 Method 3: Clone installation 111.2.4 Diagnostic Case: Un

complex multi-tiered stored procedures.650) this.width=650; "title=" clip_image004 "style=" Border-top:0px;border-right:0px;border-bottom:0px;border-left : 0px; "alt=" clip_image004 "src=" http://s3.51cto.com/wyfs02/M01/56/A6/wKiom1SKYBvgjKS3AASfPjI2BvY581.jpg "border=" 0 "height=" 519 "/>650) this.width=650; "title=" clip_image005 "style=" Border-top:0px;border-right:0px;border-bottom:0px;border-left : 0px; "alt=" clip_image005 "src=" http://s3.51cto.com/wyfs02/M02/56/A6/wKiom1SKYBzDvd-6AAYKoE

In Oracle database systems, the parameters that play the role of tuning are called initialization parameters, which are recorded in the Initsid.ora file in Oracle 8i and previous versions, while Oracle 9i/10g/ These parameters are recorded in the Spfilesid.ora binary in 11gBasic parameters: A set of adjustable paramete

Do you want to learn some tips for tuning SQL PL? If this is the case, this article will describe some common examples of tuning ibm®db2®universal database™ (UDB) V8.2 for linux,unix®, and Windows®, and will pay special attention to porting from other database management systems Come over the process. Motivation SQL p

to select the crosstab (intersection table) as the underlying table, which is the table referenced by the other table.Like what: The EMP table description describes the intersection of the location table and the category table. SELECT * FROM location L, CATEGORY C, EMP E WHERE e.emp_no between, and e.cat_no = C.cat _no and e.locn = L.LOCNwill be more efficient than the following SQL: SELECT * from EMP E, location L, CATEGORY

An analysis of tuning "session management Overhead"IntroductionDuring tuning, the management of sessions is a common problem because the overhead of maintaining sessions is relatively high."The process behaves as follows"Client request (SID) → Listener received → listener derived new process (systemprocess ID) → Client processComments:Spid:system process ID, which represents the process ID of the serverproc

-------------------------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU) | Time |-------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 11 | 189 (1) | 00:00:03 || 1 | RESULT CACHE | 27yjysxpdun18b2utun82bynny | | | | || 2 | SORT AGGREGATE | | 1 | 11 | | ||* 3 | INDEX RANGE scan| idx$$_003600

Microsoft, one is not perfect function also dare to take Out (2000) The second functional architecture of the outstanding design makes the function has a strong continuity and Scalability (2005 2000 of the function to retain and improve). The optimization tool is simple to use 1: Use SQL Server Porfiler (Event Viewer) to record all the steps of the operation database in the business system and save it as a working file. 2: Open sql2005 's database

Note: This article source: Small yan Kevin "Oracle Database Memory adjustment increased memory "Simulated operating system memory increased from 2G to 8G, adjust the database memory parameters, the example parameter is not as the actual production environment reference, because the need to take, adjust the parameters need to adjust according to the database, to avoid the calf pull cart, Daniel pull the car phenomenon.View RAW configuration Data1[Email

first wait event is read by other session. Top 5 Timed Foreground Events Read by other session is defined as follows: Read by other session Definition: When information is requested from the database, Oracle will first read the data from disk into the database buffer cache. if two or more sessions request the same information, the first session will read the data into the buffer cache while other sessions wait. in previous versions this wait was clas

Have always wanted to summarize the knowledge of Oracle memory tuning, recently optimized a database memory parameters, look for some information and Google a lot. Now write it down and do the backup. First, overview: Oracle memory can be divided into the system global zone and the process global area in terms of shared and private, that is, the SGA and the PGA

the Where condition.Now let's delete the histogram for all the columns in the table.We execute the following SQL so that the owner column is placed in the Where condition.Next we refresh the database monitoring information.We collect statistics on the table using the method_opt = ' For all columns size auto ' method.Then we look at the histogram information.From the above query we can see that Oracle autom

Buy Oracle Database Course package and enjoy 85 discount!!Package Address: http://edu.51cto.com/pack/view/id-807.htmlPerformance optimization for Oracle 11g R2 databaseDatabase performance problem is the most discussed topic in database field, because it involves database principle, IO storage, server performance, foreground application and so on, so the performance problem is very test the optimization of