oracle 12c performance tuning training

Document directory Preliminary steps Using bind variables There are several relatively easy steps you can take to improve performance. From the user's perspective, one of the most frequently used interfaces with a database involves SQL statements, so getting a handle on them is a good place to start, in terms of being able to see an immediate improvement. -->Oracle

This article describes how to adjust the performance of Oracle 9i on AIX, we all know that memory access conflicts occur when the actual applied memory of a process exceeds the total physical memory of the system, the system exchanges programs and data between memory and hard disk. Control Memory switching (Paging) A large number of memory swap operations will greatly affect the

monitoring is necessary 207Thinking on the construction of 6.7 operation and maintenance platform--meta data management 2096.8 Monitoring blind spots and diagnostic cases 210Monitoring blind spots: A potential monitoring problem caused by dual 210Diagnostic Case: Standby CPU Usage Exception Optimization 213Diagnostic Case: Two alarm information combined with analysis of DG Problem 216Diagnostic case: Monitoring anti-monitoring error--an analysis of a Orabbix alarm 222Diagnostic case: Customizin

Summary: This article begins with a detailed introduction to the concept of shared pool in Oracle and the memory structure included. It then provides an in-depth overview of Oracle's management mechanisms for shared pool. Finally, the paper introduces the practical method of buffer cache monitoring and tuning. 1. The concept of shared pool Oracle databases, as

To improve performance, we have tried a number of ways or scenarios that the Oracle database itself has provided, mainly including: Shared server mode (MTS)Cluster technology (clustering) RACPartitionParallel processing (mainly parallel queries) These features provided by Oracle are indeed used for performance improvem

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

); BEGINdbms_output.enable (1000000 ); FOR err_num IN 10000 .. 10999LOOPerr_msg: = SQLERRM (-err_num); IF err_msg not like '% message' | err_num |' not found % 'THENdbms_output.put_line (err_msg); end if; end loop; END; /On Unix systems, put the event information in a text file $ ORACLE_HOME/rdbms/mesg/oraus. msg you can use the following script to view event information event = 10000 while [$ event-ne 10999] doevent = 'expr $ event + 1' oerr ora $ eventdone for the/being tracked event, run the

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 at the SQL command processing layer and grea

As mentioned in parts 1th and 2nd, there are several relatively easy steps to improve performance you can take, one of these steps involves using an automated tool to "guide" you to write SQL statements, there are many production performance analysis or performance tuning tool manufacturers, in the following article, W

An index is an optional structure maintained by Oracle that provides fast access to data. It is difficult to know exactly where to use the index, and it is advantageous to use the index to adjust the retrieval speed. When an index is established, you must specify the name of the table used for tracking and one or more table columns. Once an index is established, Oracle automatically maintains the index when

access records in a table: A, full table scan A full table scan is a sequential access to each record in the table. Oracle optimizes full table scans in a way that reads multiple data blocks (database block) at a time. B, access to the table through rowID You can use ROWID access mode to improve the efficiency of the Access table, ROWID contains the physical location information recorded in the table. Oracle