The returned value is in seconds. This procedure sets a timeout value for resumable space allocation for the current session. The new timeout setting applies to the session immediately. When a resumable session is suspended, an operation-suspended alert is issued on the object that needs allocation of resource for the operation to complete.
Once the resource is allocated and the operation completes, the operation-suspended alert is cleared. See " Managing Tablespace Alerts " for more information on system-generated alerts. Whenever a resumable statement is suspended in any session, this trigger can have either of two effects:.
If an undo segment has reached its space limit, then a message is sent to the DBA and the statement is aborted. You can reclaim unused space. Segment Advisor, is an Oracle Database component that identifies segments that have space available for reclamation. Over time, updates and deletes on objects within a tablespace can create pockets of empty space that individually are not large enough to be reused for new data.
This type of empty space is referred to as fragmented free space. Objects with fragmented free space can result in much wasted space, and can impact database performance.
The preferred way to defragment and reclaim this space is to perform an online segment shrink. This process consolidates fragmented free space below the high water mark and compacts the segment. After compaction, the high water mark is moved, resulting in new free space above the high water mark. That space above the high water mark is then deallocated.
The segment remains available for queries and DML during most of the operation, and no extra disk space need be allocated. You use the Segment Advisor to identify segments that would benefit from online segment shrink. Only segments in locally managed tablespaces with automatic segment space management ASSM are eligible. Other restrictions on segment type exist.
For more information, see " Shrinking Database Segments Online ". If a table with reclaimable space is not eligible for online segment shrink, or if you want to make changes to logical or physical attributes of the table while reclaiming space, then you can use online table redefinition as an alternative to segment shrink.
Online redefinition is also referred to as reorganization. Unlike online segment shrink, it requires extra disk space to be allocated. See " Redefining Tables Online " for more information. Parent topic: Reclaiming Unused Space. The Segment Advisor performs its analysis by examining usage and growth statistics in the Automatic Workload Repository AWR , and by sampling the data in the segment. It is configured to run during maintenance windows as an automated maintenance task, and you can also run it on demand manually.
You can use this information for capacity planning and for arriving at an informed decision about which segments to shrink. If the Segment Advisor determines that an object has a significant amount of free space, it recommends online segment shrink. If the object is a table that is not eligible for shrinking, as in the case of a table in a tablespace without automatic segment space management, the Segment Advisor recommends online table redefinition.
If the Segment Advisor determines that a table could benefit from compression with the advanced row compression method, it makes a recommendation to that effect. Automatic Segment Advisor only. See " Automatic Segment Advisor ". If the Segment Advisor encounters a table with row chaining above a certain threshold, it records that fact that the table has an excess of chained rows.
The Segment Advisor flags only the type of row chaining that results from updates that increase row length. If you receive a space management alert, or if you decide that you want to reclaim space, you should start with the Segment Advisor. Parent topic: The Segment Advisor. For details on how to view results, see " Viewing Segment Advisor Results ". See " Running the Segment Advisor Manually " , later in this section.
The Automatic Segment Advisor is an automated maintenance task that is configured to run during all maintenance windows. The Automatic Segment Advisor does not analyze every database object. Instead, it examines database statistics, samples segment data, and then selects the following objects to analyze:. In addition, the Automatic Segment Advisor evaluates tables that are at least 10MB and that have at least three indexes to determine the amount of space saved if the tables are compressed with the advanced row compression method.
If an object is selected for analysis but the maintenance window expires before the Segment Advisor can process the object, the object is included in the next Automatic Segment Advisor run.
You cannot change the set of tablespaces and segments that the Automatic Segment Advisor selects for analysis. You can, however, enable or disable the Automatic Segment Advisor task, change the times during which the Automatic Segment Advisor is scheduled to run, or adjust automated maintenance task system resource utilization. See " Configuring the Automatic Segment Advisor " for more information.
Managing Automated Database Maintenance Tasks. You want to analyze a tablespace or segment that was not selected by the Automatic Segment Advisor. You want to repeat the analysis of an individual tablespace or segment to get more up-to-date recommendations. Segment level —Advice is generated for a single segment, such as an unpartitioned table, a partition or subpartition of a partitioned table, an index, or a LOB column.
Object level —Advice is generated for an entire object, such as a table or index. If the object is partitioned, advice is generated on all the partitions of the object. In addition, if you run Segment Advisor manually from Cloud Control, you can request advice on the object's dependent objects, such as indexes and LOB segments for a table.
Tablespace level —Advice is generated for every segment in a tablespace. There are two ways to run the Segment Advisor:. This method enables you to request advice at the tablespace level or object level. At the object level, you can request advice on tables, indexes, table partitions, and index partitions.
For example, if you display a list of tables on the Tables page accessible from the Schema menu , you can select a table and then select Run Segment Advisor from the Actions menu.
This method enables you to include the schema object's dependent objects in the Segment Advisor run. For example, if you select a table and select Run Segment Advisor , Cloud Control displays the table's dependent objects, such as partitions, index segments, LOB segments, and so on.
You can then select dependent objects to include in the run. You can schedule the job to run immediately, or can take advantage of advanced scheduling features offered by the Scheduler. The Advisor Central page appears.
See Figure Follow the wizard steps to schedule the Segment Advisor job, and then click Submit on the final wizard page. The Advisor Central page reappears, with the new Segment Advisor job at the top of the list under the Results heading. If you do not see your job, then use the search fields above the list to display it. Check the status of the job. Do not use your browser's Refresh icon. Scheduling Jobs with Oracle Scheduler for more information about the advanced scheduling features of the Scheduler.
Parent topic: Running the Segment Advisor Manually. You use package procedures to create a Segment Advisor task, set task arguments, and then execute the task. Table shows the procedures that are relevant for the Segment Advisor. Use this procedure to create the Segment Advisor task.
Use this procedure to identify the target object for segment space advice. The parameter values of this procedure depend upon the object type.
Table lists the parameter values for each type of object. Use this procedure to describe the segment advice that you need. Table shows the relevant input parameters of this procedure. Parameters not listed here are not used by the Segment Advisor. TRUE : Findings are generated on all segments specified, whether or not space reclamation is recommended.
FALSE : Findings are generated only for those objects that generate recommendations for space reclamation. If the table is not partitioned, the table segment is analyzed without any dependent segments like index or LOB segments. If the table is partitioned, the Segment Advisor analyzes all table partitions and generates separate findings and recommendations for each. The Segment Advisor creates several types of results: recommendations, findings, actions, and objects. If a segment would benefit from a segment shrink, reorganization, or compression, the Segment Advisor generates a recommendation for the segment.
Table shows examples of generated findings and recommendations. Findings are a report of what the Segment Advisor observed in analyzed segments. Findings include space used and free space statistics for each analyzed segment. Not all findings result in a recommendation.
There may be only a few recommendations, but there could be many findings. For row chaining advice, the Automatic Segment Advisor generates findings only, and not recommendations. If the Automatic Segment Advisor has no space reclamation recommendations to make, it does not generate findings. However, the Automatic Segment Advisor may generate findings for tables that could benefit from advanced row compression.
Every recommendation is associated with a suggested action to perform: either segment shrink, online redefinition reorganization , or compression. All findings, recommendations, and actions are associated with an object.
Table defines the columns in this view to query for information on the analyzed segments. You can correlate the objects in this view with the objects in the findings, recommendations, and actions views.
You can also view a list of the segments that were analyzed by the last Automatic Segment Advisor run. From the Administration menu, select Storage , then Segment Advisor. If any recommendations are present, select a tablespace, and then click Recommendation Details. The Recommendation Details page appears.
You can initiate the recommended activity from this page shrink or reorganize. The list entries are sorted in descending order by reclaimable space. You can click column headings to change the sort order or to change from ascending to descending order. If any recommendations are present, select a tablespace and click Recommendation Details.
Check that your task appears in the list under the Results heading. If it does not, complete these steps:. Select a tablespace in the list, and then click Recommendation Details. The Chained Row Analysis page appears, showing all segments that have chained rows, with a chained rows percentage for each. Parent topic: Viewing Segment Advisor Results. See Oracle Database Reference for a description of these views. The table contents summarize the possible outcomes. The command to execute. Enable row movement of the table schema.
Perform re-org on the object object , estimated savings is xxx bytes. Note: This finding is for objects with reclaimable space that are not eligible for online segment shrink. The following query returns recommendations by the most recent run of the Auto Segment Advisor, with the suggested command to run to follow the recommendations:. The Automatic Segment Advisor is an automated maintenance task.
You can also control the resources allotted to it by modifying the appropriate resource plans. The Edit Window Group page appears. Click the name of a maintenance window, and then click Edit to change the window's schedule. Each row of this view summarizes one Automatic Segment Advisor run. Fields include number of tablespaces and segments processed, and number of recommendations made. Contains control information that the Automatic Segment Advisor uses to select and process segments.
Each row contains information on a single object tablespace or segment , including whether the object has been processed, and if so, the task ID under which it was processed and the reason for selecting it. You use online segment shrink to reclaim fragmented free space below the high water mark in an Oracle Database segment.
Compaction of data leads to better cache utilization, which in turn leads to better online transaction processing OLTP performance.
The compacted data requires fewer blocks to be scanned in full table scans, which in turns leads to better decision support system DSS performance. Segment shrink is an online, in-place operation. DML operations and queries can be issued during the data movement phase of segment shrink. Concurrent DML operations are blocked for a short time at the end of the shrink operation, when the space is deallocated. What is Remote uploading?
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