oracle sql performance analyzer

in SSMS T-SQL Tools SQL Profiler Query Analyzer Database Engine Tuning Advisor Windows Event Viewer, primarily to view the following event logs Windows Application Log Windows system logs Windows security Log Windows System Monitor is able to track: SQL Server I/O

Many of my friends may be making mistakes in performance optimization as described below. If you have any need, please refer to the mistakes in SQL Server query performance optimization to get out of the index. Many of my friends may be making mistakes in performance optimization as described below. If you have any nee

The most talked about Oracle 10g performance is the new automated Workload repository (AWR) feature and proactive performance monitoring through automated database diagnostics monitoring (ADDM). When an Oracle session is established, a specially sorted area is divided into server memory to provide a sort space for the

The most important component of Oracle SQL running time is the time spent preparing new SQL statements for execution. However, if you understand the Inherent Mechanism of executable plan generation, you can control the time spent by Oracle in evaluating the table connection sequence and improve query

SQL Server query performance optimization analysis transactions and locks (2 ). Step 1: Execute Example 2 and Example 3 code in the query analyzer. (This is the example in the previous article SQLSERVER query performance optimization analysis transactions and locks (2) -- Example 2 6 is locked by 53

optimize to avoid full table scans to reduce IO waiting, thus speeding up the execution of the statement. Tip: When I do optimization sql, I often run into statements that use in, and then we have to replace it with exists, because Oracle does it in the same way as or, even if you use an index, it's slow. Like what: SELECT Col1,col2,col3 from table1 a WHERE a.col1 not in (SELECT col1 from Table2) Can be r

32712.2 database and agile development 32812.3 progressive Data Modeling 32912.4 rebuilding a database 33112.5 create an access layer through PL/SQL 33512.6 agile declaration 34712.7 incremental data modeling with PL/SQL 34912.7.1 define interface 34912.7.2 think about scalability 34912.7.3 test-driven development 35012.7.4 use mode and user 350 wisely12.8 conclusion 351Chapter 2

Server Load balancer for our customers. In fact, it is one-sided. RAC mainly targets Server Load balancer for CPU and memory,Disk I/O load balancing is not implemented. (Of course, disk I/O can be achieved through Raid or NAS) Another advantage of RAC is that it improves availability, that is, a server is broken (Note: it is not a data storage medium) and does not affect normal use.Like Server Load balancer, it improves the availability above the data layer, but not all, because the data is bro

sequential access to each record in the table. Oracle optimizes full table scan by reading multiple data blocks at a time. 2. Access the table through rowid You can use rowid-based access to improve the efficiency of accessing tables. rowid contains the physical location information recorded in the table .. oracle uses indexes to establish a connection between data and the physical location where data is s

According to Oracle's documentation, the data pump in different ways to export imports, performance can be significantly different, this time just have the opportunity to test, migration table space, direct path, external table, and database chain export, import performance differences. This test direct path export, import method. First clear the user and tablespace imported from the previous article, and

. Use where to replace having (if possible)Optimize GROUP BY:Increase the efficiency of the group BY statement by filtering out unwanted records before group by. The following two queries return the same result but the second one is significantly faster.Copy CodeThe code is as follows:Low efficiency:SELECT JOB, AVG (SAL)From EMP GROUP job has job = ' president ' and AVG (SAL) >xxxEfficient:SELECT JOB, AVG (SAL)From EMPWHERE JOB = ' President 'OR job = ' MANAGER ' GROUP JOB having and AVG (SAL) >

. In the case of Alpha 1200 for the revenue system, the SGA is about 160 megabytes in size. Some parameters in the initialization parameter file have a decisive effect on the size of the SGA. Parameter db-block-buffers (number of buffers cached in the SGA), parameter shared-pool-size (number of bytes allocated to the shared SQL area), is the main influence of the SGA size. The Db-block-buffers parameter is the most important determinant of the SGA siz

business system, at the peak of business will form a large number of centralized concurrent operations, resulting in a large number of I/O operation; 2 , non-standard SQL statement resulting in excessive disk access (e.g., full table scan, etc.); 3 , due to hardware-caused storage IO its own performance problems; is a certain customer in the real environmentI/Oof per