oracle query optimization tool

course, the performance boost is small, but if your server is running thousands or more of stored procedures every hour, these savings can add up to a significant amount of time.14. Constraints and triggers for integrity use:Do not perform redundant integrity features in the database. For example, if you are using primary KEY and foreign key constraints to force referential integrity, do not add triggers to achieve the same functionality and add unnecessary overhead. It also performs extra work

as the query conditions, the time is 8 bytes and does not overlap. it is suitable to set indexes. I set the time to index, which has a little effect, but it is not very good. estimated: 8*4000 0000 = 320 000 bytes, 40 million the record of the table only takes a field index of 320 MB, which is only one table of our hundreds of tables (the customer asked us to keep at least three months of records ). Index creation can play a certain role, but it stil

, there are many time fields as the query conditions, the time is 8 bytes and does not overlap. it is suitable to set indexes. I set the time to index, which has a little effect, but it is not very good. estimated: 8*4000 0000 = 320 000 bytes, 40 million the record of the table only takes a field index of 320 MB, which is only one table of our hundreds of tables (the customer asked us to keep at least three months of records ). Index creation can play

I. Introduction of PT-QUERY-DIGEST ToolsPt-query-digest is a tool for analyzing MySQL slow query, which can analyze Binlog, general log, Slowlog, or through show Processlist or the MySQL protocol data captured by Tcpdump is analyzed. The analysis results can be exported to a file, the analysis process is the parameters

Navicat Oracle features an intuitive GUI and provides powerful visualization tools such as query editor and syntax highlighting capabilities when previewing SQL, SQL console, text, hexadecimal and blob view/Editor, ssh tunnel and more to improve work efficiency.Installation: 1. download navicat for oracle2. download Oracle 11g odac and

tables (the customer asked us to keep at least three months of records ). Index creation can play a certain role, but it still cannot solve our problem. Creating a physical table can no longer shorten the time, because one table is created every day, and 91 ~ 92 tables, more than 2700 for 30 protocol modules. This is only a protocol flow log table, and there are other tables. Nor can we set all the fields required for condition-making as indexes, so the index table will be about the same as the

Oracle query specified index improve query efficiency a 16 million data table--SMS Uplink table Tbl_sms_moStructure:CREATE TABLE Tbl_sms_mo(SMS_ID number,mo_id VARCHAR2 (50),MOBILE VARCHAR2 (11),Spnumber VARCHAR2 (20),Message VARCHAR2 (150),Trade_code VARCHAR2 (20),link_id VARCHAR2 (50),GATEWAY_ID number,Gateway_port number,Mo_time DATE DEFAULT sysdate);CREATE IN

Tags: file http img Local image HTTPS student engine MSSThe recent project to do thousands of students to face recognition record (currently about 630000 lines) query the last record, it is conceivable that the performance of this piece is a problem. As a shen, get to SQL Server Profiler and Database Engine Tuning Advisor These two jobs are QI.Start to install force ...First, a SQL statement that performs less efficientlySave trace files from SQL Serv

(01) Select the most efficient table name sequence (written test)The parser for Oracle processes the table names in the FROM clause in a right-to-left order.The last table written in the FROM clause will be processed first,In cases where the FROM clause contains more than one table, you must select the table with the fewest number of record bars to put in the last,If you have more than 3 tables connected to the qu