Skip to main content

To know free space,used space of each and every datafile in a tablespace

Hi all,

Here we'll see how do we check the free space and used space of each datafile separately in the tablespace as i said in previous post

We can use the below query to check the space usage of each and every data file in the tablespaces.

break on report
compute sum of allocated_mb on report
compute sum of used_mb on report
compute sum of free_space_mb on report
set lines 500
COLUMN free_space_mb format 999999.90
COLUMN allocated_mb format 999999.90
COLUMN used_mb format 999999.90
col file_name for a60
SELECT   SUBSTR (df.NAME, 1, 60) file_name, df.bytes / 1024 / 1024 allocated_mb,
         ((df.bytes / 1024 / 1024) - NVL (SUM (dfs.bytes) / 1024 / 1024, 0))
               used_mb,
         NVL (SUM (dfs.bytes) / 1024 / 1024, 0) free_space_mb
    FROM v$datafile df, dba_free_space dfs
   WHERE df.file# = dfs.file_id(+) and dfs.TABLESPACE_NAME='_DATA'
GROUP BY dfs.file_id, df.NAME, df.file#, df.bytes
ORDER BY file_name;


Output:









The output is taken for one tablespace (_DATA) which contains 16 datafiles in it. So you can know the used space, free space and its allocated space of datafiles separately.

Comments

Post a Comment

Popular posts from this blog

Export and import multiple schema using expdp/impdp (Data Pump utility)

Use the below sql query to export and import multiple schema: expdp schemas=schema1,schema2,schema3 directory=DATA_PUMP_DIR dumpfile=schemas120514bkp.dmp exclude=statistics logfile=expdpschemas120514.log impdp schemas=schema1,schema2,schema3 directory=DATA_PUMP_DIR dumpfile=schemas120514bkp.dmp logfile=impdpschemas120514.log sql query to export and import a schema: expdp schemas=schema directory=DATA_PUMP_DIR dumpfile=schema120514bkp.dmp exclude=statistics logfile=expdpschema120514.log impdp schemas=schema directory=DATA_PUMP_DIR dumpfile=schema120514bkp.dmp logfile=expdpschema120514.log Parameter STATISTICS=NONE can either be used in export or import. No need to use the parameter in both. To export meta data only to get ddl of the schemas: expdp schemas=schema1,schema2,schema3 directory=TEST_DIR dumpfile=content.dat content=METADATA_ONLY exclude=statistics To get the DDL in a text file: impdp directory=TEST_DIR sqlfile=sql.dat logfile=sql.log dumpfil...
3 comments
Read more

Pinning execution plan for a sql_id using 'SQL Profile' to consistently reproduce a good plan

Deal all, Below post content is not my own. It is taken from MOSC document but the example shown below is taken from our environment. I got to know the below topic when we had experienced the bad SQL query performance in one of our production environment during daily batch running time. Hence we had implemented the same mentioned in the title "Pinning execution plan for a sql_id using 'SQL Profile' to consistently reproduce a good plan". Introduction The "cost-based optimizer (CBO or just optimizer) is the part of database software that determines the most efficient means of accessing the specified data (or at least what it "calculates" as the most efficient). The optimizer determines which execution plan is most efficient by considering several sources of information, including query conditions, available access paths, statistics gathered for the system, and hints. Some changes in those conditions may affect the calculations of the plan...
9 comments
Read more

Metrics Process Limit Usage percentage (%) is critical or warning in OEM or Cloud Control 12c or Cloud Control 13c

Please run the below queries to trace details during Metric alert "Process Limit % is >= 75" in OEM or Cloud Control 12c or Cloud Control 13c To check the Metrics Process Limit Usage (%): ***************************************************** set lines 300 col INITIAL_ALLOCATION for a17 col LIMIT_VALUE for a12 select resource_name,current_utilization,max_utilization, INITIAL_ALLOCATION,LIMIT_VALUE,((current_utilization*100)/(INITIAL_ALLOCATION)) as "Process limit %" from v$resource_limit where resource_name in ('processes'); The below query will give you all connected sessions (ACTIVE and INACTIVE) to instance: ******************************************************************************************************* set pages 100 set lines 1000 col SPID heading 'PID' for a06 col SID for 99999 col SERIAL# heading 'serial' for 999999 col SQL_ID for a14 col USERNAME for a10 col PROGRAM for a20 col MODULE for a18 col OSU...
Post a Comment
Read more