slacker plans

On the evening of January 1, August 19, Beijing time, a message from the Financial Times shocked the security industry. Chip giant Intel plans to invest $7.68 billion to acquire McAfee, a security company ). Text/figure Wang Wenwen After the message was sent, McAfee's share price rose by more than 50%. Paul Otellini, Chief Executive Officer of Intel, said: as the number of devices connected to the Internet continues to grow, more and more elemen

Article Description: product design principles of four: there are plans to introduce your products. In the Monday, I wrote this series of the third article "Product design principles Three: Perfect later on line" received a lot of people's attention, mixed. Well, I'd say I'm very grateful for the agreement, the reason for the brick is also very good: the product line needs to have a time plan, not for the so-called perfect, has been postpon

Tags: anti map scan min uniq value sem bitmap sortTo access the execution plan for a table:All-table Scan: Table ACCESS fullROWID Scan: Table access by user ROWID (ROWID from the user's specified in where condition) or table access by index ROWID (ROWID from index) Execution plan related to the B-Tree index:Index unique scanning: index unique scanIndex Range Scan:Index Full scan: IndexIndex fast full scan: Index fast fully scanIndex Hop Scan: Index skip Scan Execution plan related to bitmap inde

index gets the record, it takes the record directly, and does not perform a full table scan, so its query speed is the fastest. When we look at the execution plan results, if we see "Table Scan", it means that the table does not have any indexes, including the clustered index. But often see more is "Clustered Index Scan", that the query or scan the speed of the table, but by the clustered index, the actual effect or "Table Scan" is no different, so, at this time we may want to consider est

;" >set AUTOTRACE on -- contains execution plans, statistics, and execution results set AUTOTRACE traceonly -- When using SET AUTOTRACE on EXPLAIN, the execution results are displayed, and the execution plan,When using SET AUTOTRACE on STATISTICS, the execution results, and statistics, are displayed.When using SET AUTOTRACE on, display execution results, execution plan and statistics,Show execution plan and statistics when using SET AUTOTRACE tr

The execution plan of SQL actually represents the specific execution steps of the target SQL within the Oracle database, and as a tuning, only know if the execution plan chosen by the optimizer is the best execution plan in the current situation, then we can know the direction of the next step.Execution Plan definition: A combination of all the steps to execute a target SQL .Let's start by listing some common ways to view execution plans:1. Explain pl

Statown Dbms_stats.delete_table_stats is used to delete statistics.Example:------Delete statistics [email protected]> exec dbms_stats.delete_table_stats (ownname = ' Scott ', tabname = ' emp ');PL/The SQL process has completed successfully. ----Query statistic informationSCOTT@PDBORCL> SelectTable_name,num_rows fromUser_tableswheretable_name= 'EMP'; TABLE_NAME Num_rows-------- ----------EMP---Get statistical information [email protected]> exec dbms_stats.gather_table_stats (ownname = ' Sc

Common Methods for viewing Oracle execution plans-Series 2 Continued article: http://blog.csdn.net/bisal/article/details/38919181 3. AUTOTRACE Switch Turn on AUTOTRACE in SQLPLUS to get the SQL Execution Plan. The prompt shows that AUTOTRACE has several options: OFF/ON/TRACEONLY/EXPLAIN/STATISTICS. Lab: 1. Execute set autotrace on: 2. Execute set autotrace traceonly: VcD4KPHA + pgltzybzcm9 "http://www.2cto.com/uploadfile/Collfiles/20140917/201

The following article describes how to use optimizer updates to execute plans in DB2 databases, we all know that in a DB2 database, the optimizer is generally used to analyze SQL statements and generate an Access Plan that is considered optimal ). The DB2 optimizer is actually a set of standard rules. Generally, we only need to tell DB2 what to search, not how to search. So what is the DB2 optimizer used to determine the optimal SQL access path? DB2 o

Without third-party tools, view SQL Execution plans SQL> connect sys as sysdba -- create the table SQL used by the execution plan> @? \ Rdbms \ admin \ utlxplan grants the Autotrace permission to each user by using the following methods. If you need to restrict the Autotrace permission, you can change the public authorization to the specific user authorization. Www.2cto.com 1. grant all permissions to the plan_table table to the public role SQL> grant

Oracle AWR threshold affects the historical execution plan. Some netizens recently mentioned why the historical execution plan of SQL statements cannot be viewed in dba_hist_ SQL _plan. This problem is caused by default, the threshold value set by Oracle does not capture all SQL statements, so it is normal to see some historical SQL Execution plans. In Oracle 9i, we can set different snapshot levels to obtain detailed information of different degrees.

development opportunity. Between the ages of 25 and 32 is the accumulation stage. During this period, they should have performance. If they are successful, they should have the right to return (including monetary return ). Basic quota After the return, it is to solve the family problem and build a family. Some people will try to become "professionals" in this industry ". Therefore, Bai Ling thinks that when she was in her 30 s, she already had a basic career model. Some people have to start the

goal. The long-term goal must also be tied to the intermediate goal. Its level is certainly higher, with a time span of more than five years. In addition, the long-term goal is generally not related to the specific XX language, XX platform, etc., but is often associated with career positions. For example, "become technical director in 5-7 years" and "become product architect in 5 years.　After you have set all three goals, you have formed a personal development plan. Since it is a plan, You Have

Personal plans will never go messy: five timed reminder software for horizontal Evaluation (16:19:57) Category: Work articles Generally, the reminder software is simple and may not be used by everyone. But for users who need to use computers as work tools, a good reminder software will often bring great help to their work and learning. With the help of the reminder software, you don't have to worry about forgetting anyt

Tags: javascript Oracle review plan Java MySQL After three months of training in chinansoft, I handed in a lot of "messy" things and felt like watering my head, so I didn't absorb it very well. It's time to reorganize the knowledge. To sum up, I learned the following knowledge: 1. html, CSS, JavaScript, jquery, JSON, and Ajax 2. servlet, XML, JSP, and log4j 3. MySQL and Oracle 4. Java, GitHub, and SSH (learning not started yet) The following review plan is developed to ensure that the

here indicates that the optimizer considers the cost of the execution plan:Select statement Optimizer = CHOOSE (Cost = 1234 Card = 1 Bytes = 14) However, if the information shown in the execution plan is similar to the following, it indicates that the RBO optimizer is used because the value of the cost part is null or there is no cost part at all.Select statement Optimizer = CHOOSE Cost =Select statement Optimizer = CHOOSEIn this way, we can find out the Optimizer used to execute the statement

MSSQL Optimization-exploring MSSQL execution plans Author: nz. perfectaction QQ: 34813284Time: 2006.11.07 23:30:00Environment: win2003 + mssql2005 Recently, I have always wanted to understand and understand MSSQL, but I have never thought about it and have no time to write it. At night I wrote an execution plan to explore MSSQL, this article describes the execution plan, but not limited to the execution plan.There are a lot of articles on SQL Optimiz

Some netizens recently mentioned why the historical execution plan of SQL statements cannot be viewed in dba_hist_ SQL _plan. This problem is due to the fact that the threshold value set by Oracle does not capture all SQL statements by default, therefore, it is normal to see some SQL history execution plans. In Oracle 9i, we can set different snapshot levels to obtain detailed information of different degrees. You can also separately configure the SQL

Obtaining execution plans and execution costs and writing the optimal SQL statements are required by each Oracle Developer and dba. After Oracle 11g is passed, auto trace is automatically enabled for dba role by default? Configure autotrace: Enter $ ORACLE_HOME/rdbms/admin Go to sqlplus, Run: SQL> @ utlxplan Create an analysis table. For ease of operation, we can create a synonym SQL> create public synonym plan_table for plan_table; We can grant this

Some netizens recently mentioned why the historical execution plan of SQL statements cannot be viewed in dba_hist_ SQL _plan. This problem is due to the fact that the threshold value set by Oracle does not capture all SQL statements by default, therefore, it is normal to see some SQL history execution plans. In Oracle 9i, we can set different snapshot levels to obtain detailed information of different degrees. You can also separately configure the SQL