21 August 2026

Temp Tablespace Allocated (MB) – TEMP

by Kellyn Gorman

15 0 Performance, Storage Oracle

Metrics install automatically if you have Redgate Monitor installed.

If you are using Redgate’s SQL Server monitoring tool, Redgate Monitor, you can instantly install and run this metric on your servers.

Temporary tablespaces autoextend to satisfy large sorts, hash joins, and global temporary tables. Runaway growth often signals a bad plan or a missing index and can consume the underlying filesystem.

Required permissions:

GRANT SELECT ON CDB_TEMP_FILES TO redgate_monitor_user CONTAINER=ALL;

These are covered by Redgate Monitor’s standard Oracle monitoring user — if it was set up as described in the product documentation, no additional grants are needed.

Metric definition

Name

Temp Tablespace Allocated (MB) – TEMP

Description

Tracks the total allocated size of a temp tablespace's files so you can alert when growth exceeds a size you choose ("X"). Once allocated, temp files do not automatically shrink, so expect the value to stay at its high-water mark until the temp file is resized or recreated. Create one instance of this metric per temporary tablespace (there can be more than one), substituting the tablespace name in the WHERE clause.

Supported database engine

Oracle

The T-SQL query that will collect data


		
			
			
Transact-SQL
			
			-- Returns total allocated temp file size in MB (detects autoextend growth)
-- Replace TEMP with your temporary tablespace name; one row is returned per container that has it
SELECT f.con_id,
       ROUND(SUM(f.bytes) / 1024 / 1024, 2) AS metric_value,
       f.tablespace_name || ' ' || ROUND(SUM(f.bytes) / 1024 / 1024) || ' MB allocated of '
           || ROUND(SUM(CASE WHEN f.autoextensible = 'YES' THEN f.maxbytes ELSE f.bytes END) / 1024 / 1024)
           || ' MB max' AS alert_detail_text
  FROM cdb_temp_files f
 WHERE f.tablespace_name = 'TEMP'
 GROUP BY f.con_id, f.tablespace_name
			
				
					
				
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						-- Returns total allocated temp file size in MB (detects autoextend growth)
-- Replace TEMP with your temporary tablespace name; one row is returned per container that has it
SELECT f.con_id,
       ROUND(SUM(f.bytes) / 1024 / 1024, 2) AS metric_value,
       f.tablespace_name || ' ' || ROUND(SUM(f.bytes) / 1024 / 1024) || ' MB allocated of '
           || ROUND(SUM(CASE WHEN f.autoextensible = 'YES' THEN f.maxbytes ELSE f.bytes END) / 1024 / 1024)
           || ' MB max' AS alert_detail_text
  FROM cdb_temp_files f
 WHERE f.tablespace_name = 'TEMP'
 GROUP BY f.con_id, f.tablespace_name

Instances to collect from

Select all monitored Oracle instances

Databases to collect from

Not applicable - Oracle custom metrics collect once per instance, and values are stored per container (PDB) via the con_id column

Collection frequency

300

seconds (collected every 5 minutes)

Use collected or calculated values

Leave the Use a calculated rate of change between collections check box unchecked

Metric collection

Enabled

Alert definition

Alert name

Temp tablespace growth – TEMP

Description

The total allocated temp file size for this tablespace has exceeded X, where X is the size at which you want to be warned (for example, 1.5x the temp tablespace's normal steady-state size).

Raise an alert when the metric value goes

Above the defined threshholds

Default threshold values

High:	10240
Medium:
Low:

Note: These thresholds are intended as guideline values. If they seem too high or too low for your environment, replace them with values more suited to your server performance.

Raise an alert when the threshold is passed for

2 collections

Alert is

Enabled

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Temp Tablespace Allocated (MB) – TEMP

Metric definition

Name

Description

Supported database engine

The T-SQL query that will collect data

Instances to collect from

Databases to collect from

Collection frequency

Use collected or calculated values

Metric collection

Alert definition

Alert name

Description

Raise an alert when the metric value goes

Default threshold values

Raise an alert when the threshold is passed for

Alert is

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