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Contents
- 1 Oracle Data Export and Import using DataPump expdp and impdp
- 2 How do I export statistics in Oracle 12c?
- 3 Can we gather stats on view in Oracle?
- 4 Where are statistics stored in Oracle?
- 5 How do I copy statistics from one database to another?
- 6 Information related to the topic export import statistics oracle
Oracle Data Export and Import using DataPump expdp and impdp
14.1 Understanding Statistics
The optimizer statistics are stored in the data dictionary. They can be viewed using data dictionary views.You can use this package to gather, modify, view, export, import, and delete statistics. You can also use this package to identify or name statistics gathered. The DBMS_STATS package can gather statistics on indexes, tables, columns, and partitions, as well as statistics on all schema objects in a schema or database.
- DEMO:
- create a table to store the stats: …
- Now export the statistics of the table RAJ. …
- Now take expdp of this stats table(STAT_TEST) …
- Move the dump file from PROD to TEST machine and import the same. …
- Now import the statistics in database: …
- For database :
- For schema:
- Log onto the database. sqlplus ‘/ as sysdba’
- Create a table to hold the exported statistics. SQL> exec DBMS_STATS.CREATE_STAT_TABLE(‘<table owner>’,'<enter a name for the stats table>’,'<tablespace to store the stats table’); …
- Export the database statistics.
How do I export statistics in Oracle 12c?
- Log onto the database. sqlplus ‘/ as sysdba’
- Create a table to hold the exported statistics. SQL> exec DBMS_STATS.CREATE_STAT_TABLE(‘<table owner>’,'<enter a name for the stats table>’,'<tablespace to store the stats table’); …
- Export the database statistics.
How do I transfer statistics from one database to another?
- Create the STATS table.
- Export the statistics to the STATS table.
- Export the STATS table using export(exp) or datapump(expdp)
- Transfer the dump file to the destination database.
- Import the STATS table to the destination database.
- Import the statistics into the data dictionary.
- Changing the schema name.
How do I backup a table statistics in Oracle?
- DEMO:
- create a table to store the stats: …
- Now export the statistics of the table RAJ. …
- Now take expdp of this stats table(STAT_TEST) …
- Move the dump file from PROD to TEST machine and import the same. …
- Now import the statistics in database: …
- For database :
- For schema:
Where are statistics stored in Oracle?
14.1 Understanding Statistics
The optimizer statistics are stored in the data dictionary. They can be viewed using data dictionary views.
How do I export data from Oracle to excel?
Select Tools, and then Export as Spreadsheet. Depending on how you want to export the data, take an action: Select Save, and then save the file. Select Open, and then work with the data in the browser instance of Microsoft Excel that displays.
Can we gather stats on view in Oracle?
You can use this package to gather, modify, view, export, import, and delete statistics. You can also use this package to identify or name statistics gathered. The DBMS_STATS package can gather statistics on indexes, tables, columns, and partitions, as well as statistics on all schema objects in a schema or database.
Can we have index on views in Oracle?
Oracle SQL standards do not support creating indexes on views. If you need to index documents whose contents are in different tables, you can create a data storage preference using the USER_DATASTORE object.
Does view contain data Oracle?
A view contains no data itself. The tables upon which a view is based are called base tables. You can also create an object view or a relational view that supports LOBs, object types, REF datatypes, nested table, or varray types on top of the existing view mechanism.
What does gather stats do in Oracle?
Administrators can gather statistics for both states and activate appropriate OLTP or OLAP statistics when needed. This enables the optimizer to generate relevant costs with respect to available system resource plans. When Oracle generates system statistics, it analyzes system activity in a specified period of time.
Do we need to gather stats after index creation?
Best Answer
You must have created the table and populated it at the same time, with a CREATE TABLE … AS SELECT …. – this is when table statistics are gathered for you automatically when the table is created.
Where are statistics stored in Oracle?
14.1 Understanding Statistics
The optimizer statistics are stored in the data dictionary. They can be viewed using data dictionary views.
What are statistics in Oracle database?
Optimizer statistics are a collection of data that describe the database, and the objects in the database. These statistics are used by the Optimizer to choose the best execution plan for each SQL statement. Statistics are stored in the data dictionary, and can be accessed using data dictionary views such as.
How do you check if stats are gathered for a table in Oracle?
…
Check update statistics time in Oracle
- table_name: Name of table.
- num_rows: number of rows in table.
- sample_size: what is the detail level of statistics collected.
- last_analyzed: last update statistics timestamps.
Where is Oracle database data stored?
Most Oracle databases store files in a file system, which is a data structure built inside a contiguous disk address space. All operating systems have file managers that allocate and deallocate disk space into files within a file system.
Why do we collect stats in Oracle?
You must gather statistics on a regular basis to provide the optimizer with information about schema objects. New statistics should be gathered after a schema object’s data or structure are modified in ways that make the previous statistics inaccurate.
How do I copy statistics from one database to another?
- Create the STATS table.
- Export the statistics to the STATS table.
- Export the STATS table using export(exp) or datapump(expdp)
- Transfer the dump file to the destination database.
- Import the STATS table to the destination database.
- Import the statistics into the data dictionary.
- Changing the schema name.
References:
How to export and import statistics in oracle – DBACLASS
Importing and Exporting Optimizer Statistics – Oracle Help Center
Export & Import Statistics – OracleFiles
17 Importing and Exporting Optimizer Statistics – docs.oracle.com
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