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zero wait system. The key question should not be whether you have any Oracle wait events occurring, but rather if there are excessive waits.

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Any time a server process waits for an event to complete, it s classified as a wait event There are more than 860 Oracle wait events in Oracle Database 10g The most common wait events are those caused by resource contention such as latch contention, buffer contention, and I/O contention A wait class is a grouping of related wait events, and every wait event belongs to a wait class Important wait classes include Administrative, Application, Concurrency, Configuration, Idle, Network, System I/O, and User I/O For example, the Administrative wait class includes lock waits caused by row-level locking The User I/O class of waits refers to waits for blocks to be read off a disk Using wait classes helps you move quickly to the root cause of a problem in your database by limiting the focus of further analysis.

Here s a summary of the main wait classes in Oracle Database 10g: Administrative: Waits caused by administrative commands, such as rebuilding an index, for example Application: Waits due to the application code Cluster: Waits related to Real Application Cluster management Commit: Consists of the single wait event log file sync, which is a wait caused by commits in the database Concurrency: Waits for database resources that are used for locking; for example, latches Configuration: Waits caused by database or instance configuration problems, including a low shared-pool memory size, for example Idle: Idle wait events indicate waits that occur when a session isn t active; for example, the 'SQL*Net message from client' wait event Network: Waits incurred during network messaging Other: Miscellaneous waits Scheduler: Resource Manager-related waits System I/O: Waits for background-process I/O, including the database writer background process (DBWR) wait for the db file parallel write event.

Also included are archivelog related waits and redo log read-and-write waits User I/O: Waits for user I/O Includes the db file sequential read and db file scattered read events..

In the next example, we search for node2 and insert another entry following the line that is found. This command sequence is nearly identical to the previous example, with only a slight modification so the new text follows the line that was found in the search. The i command to insert the new text has been replaced with the a to append the new text. The text and the closing period remain unchanged.

One of the first things you can do to measure instance performance efficiency is to determine the proportion of total time the database is spending working compared to the proportion of time it s merely waiting for resources. The V$SYSMETRIC view displays the system metric values for the most current time interval. The following query using the V$SYSMETRIC view reveals a database instance where waits are taking more time than the instance CPU usage time: SQL> SELECT METRIC_NAME, VALUE FROM V$SYSMETRIC WHERE METRIC_NAME IN ('Database CPU Time Ratio', 'Database Wait Time Ratio') AND INTSIZE_CSEC = (select max(INTSIZE_CSEC) from V$SYSMETRIC);