What is exclude STATISTICS in Impdp?

What is exclude STATISTICS in Impdp?

>> Using the EXCLUDE=STATISTICS parameter value of impdp prevents the automatic of gathering of object statistics by impdp. Setting this parameter value will greatly improve impdp performance.

Why exclude STATISTICS in expdp?

We have used EXCLUDE=STATISTICS option in export data pump (expdp). When importing (impdp) to new database, you have noticed some missing INDEXES in target. If we remove EXCLUDE=STATISTICS option, then we can match all indexes. database.

How do you exclude parameters in Expdp?

If the expdp exclude parameter is used directly from the command line (and not in a parameter file (parfile)), the special characters (quote marks) in the exclude clause may need to be escaped with backslash (\) character. Because of this, it is recommended that you always use a parameter file (parfile).

How do I improve my Expdp performance 12c?

Export performance tips: parallelism in data pump. With the help of PARALLEL parameter ( tuning parameter ), we can achieve dynamic increase & decrease of resource consumption for each job. Worker (Parallel) count should be EXACT no of dump file & twice the number of CPU’s (two workers for each CPU).

How do I make Impdp faster?

Maximizing Oracle Import (impdp) Performance

1. Analyze once after the load – Set analyze=n and analyze with dbms_stats after the load has completed.
2. Disable redo logs: You can use the impdp nologging mode with transform=disable_archive_logging to disable all redo logging for Oracle 12c imports.

How can I speed up my data pump export?

5 Tips to Speed Up Data Pump Export or Import

1. Parallelize executions.
2. Decompose a partitioned table into partitions in par files.
3. Set the parameter ESTIMATE to STATISTICS.
4. Turn on Asynchronous Disk IO.
5. For 11.2 and later, set ACCESS_METHOD to DIRECT_PATH.

How do I speed up Expdp?

take a new archivelog backup on the source database (to simulate the real scenario) catalog the backup folder on the temporary database with RMAN. do another recover database on temporary database, it should apply the archivelogs of the day, then check again the SCN. open the database in resetlogs mode.

When to use exclude = Statistics in impdp command?

some DBA’s use EXCLUDE=STATISTICS parameter in their import datapump command in order to speed up the import process. *** example of impdp command: However, in reality indexes created while importing are “analyzed” automatically, and this is performed by design.

When to use exclude = Statistics in import datapump?

some DBA’s use EXCLUDE=STATISTICS parameter in their import datapump command in order to speed up the import process. *** example of impdp command: However, in reality indexes created while importing are “analyzed” automatically, and this is performed by design. Only tables that are not going to be “analyzed” while importing.

Why do I need to exclude statistics during export?

I would recommend to exclude the statistics during export because data pump jobs can hang, sometimes indefinitely, when concurrent statistics generation for a same table is being performed by both the Data Pump engine and by any other users. You can use parallel to speedup the datapump jobs.

How to exclude all indexes in a database?

For example, you could set EXCLUDE=INDEX:”LIKE ‘DEPT%'” to exclude all indexes whose names start with dept. The name that you supply for the name_clause must exactly match, including upper and lower casing, an existing object in the database.