Managing buffer pools Managing databases Managing storage Managing tablespaces

Performing common database tasks for Amazon RDS for Db2 DB instances

You can perform certain common DBA tasks related to databases on your Amazon RDS for Db2 DB instances. To deliver a managed service experience, Amazon RDS doesn't provide shell access to DB instances. Also, the master user can't run commands or utilities requiring SYSADM, SYSMAINT, or SYSCTRL authorities.

Managing buffer pools

You can create, alter, or drop buffer pools for an RDS for Db2 database. Creating, altering, or dropping buffer pools requires higher-level SYSADM or SYSCTRL authority, which isn't available to the master user. Instead, use Amazon RDS stored procedures.

You can also flush buffer pools.

Topics

Creating a buffer pool
Altering a buffer pool
Dropping a buffer pool
Flushing the buffer pools

Creating a buffer pool

To create a buffer pool for your RDS for Db2 database, call the rdsadmin.create_bufferpool stored procedure. For more information, see CREATE BUFFERPOOL statement in the IBM Db2 documentation.

To create a buffer pool

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_user using master_password"
```

Create a buffer pool by calling rdsadmin.create_bufferpool. For more information, see rdsadmin.create_bufferpool.


db2 "call rdsadmin.create_bufferpool(
    'database_name', 
    'buffer_pool_name', 
    buffer_pool_size, 
    'immediate', 
    'automatic', 
    page_size, 
    number_block_pages, 
    block_size)"

Altering a buffer pool

To alter a buffer pool for your RDS for Db2 database, call the rdsadmin.alter_bufferpool stored procedure. For more information, see ALTER BUFFERPOOL statement in the IBM Db2 documentation.

To alter a buffer pool

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_username using master_password"
```

Alter a buffer pool by calling rdsadmin.alter_bufferpool. For more information, see rdsadmin.alter_bufferpool.


db2 "call rdsadmin.alter_bufferpool(
    'database_name', 
    'buffer_pool_name', 
    buffer_pool_size, 
    'immediate', 
    'automatic', 
    change_number_blocks, 
    number_block_pages, 
    block_size)"

Dropping a buffer pool

To drop a buffer pool for your RDS for Db2 database, call the rdsadmin.drop_bufferpool stored procedure. For more information, see Dropping buffer pools in the IBM Db2 documentation.

Important

Make sure that no tablespaces are assigned to the buffer pool that you want to drop.

To drop a buffer pool

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_user using master_password"
```
Drop a buffer pool by calling rdsadmin.drop_bufferpool. For more information, see rdsadmin.drop_bufferpool.
```
db2 "call rdsadmin.drop_bufferpool(
    'database_name', 
    'buffer_pool_name')"
```

Flushing the buffer pools

You can flush the buffer pools to force a checkpoint so that RDS for Db2 writes pages from memory to storage.

Note

You don't need to flush the buffer pools. Db2 writes logs synchronously before it commits transactions. The dirty pages might still be in a buffer pool, but Db2 writes them to storage asynchronously. Even if the system shuts down unexpectedly, when you restart the database, Db2 automatically performs crash recovery. During crash recovery, Db2 writes committed changes to the database or rolls back changes for uncommitted transactions.

To flush the buffer pools

Connect to your Db2 database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace rds_database_alias, master_username, and master_password with your own information.
```
db2 connect to rds_database_alias user master_username using master_password
```
Flush the buffer pools.
```
db2 flush bufferpools all
```

Managing databases

You can create, drop, or restore databases on your RDS for Db2 DB instance. Creating, dropping, or restoring databases requires higher-level SYSADM authority, which isn't available to the master user. Instead, use Amazon RDS stored procedures.

You can also perform common management tasks such as monitoring, maintenance, and the collection of information about your databases.

Topics

Creating a database
Configuring settings for a database
Modifying database parameters
Configuring log retention
Dropping a database
Restoring a database
Collecting information about databases
Forcing applications off of databases
Generating performance reports

Creating a database

To create a database on your RDS for Db2 DB instance, call the rdsadmin.create_database stored procedure. For more information, see CREATE DATABASE command in the IBM Db2 documentation.

Note

You can create a database by calling the stored procedure if you didn't specify the name of the database when you created your RDS for Db2 DB instance by using either the Amazon RDS console or the AWS CLI. For more information, see Usage notes for rdsadmin.create_database.

To create a database

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_user using master_password"
```
Create a database by calling rdsadmin.create_database. For more information, see rdsadmin.create_database.
```
db2 "call rdsadmin.create_database('database_name')"
```

Configuring settings for a database

To configure the settings for a database on your RDS for Db2 DB instance, call the rdsadmin.set_configuration stored procedure. For example, you could configure the number of buffers or buffer manipulators to create during a restore operation.

To configure settings for a database

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_user using master_password"
```
(Optional) Check your current configuration settings by calling rdsadmin.show_configuration. For more information, see rdsadmin.show_configuration.
```
db2 "call rdsadmin.show_configuration('name')"
```
Configure the settings for the database by calling rdsadmin.set_configuration. For more information, see rdsadmin.set_configuration.
```
db2 "call rdsadmin.set_configuration(
    'name',  
    'value')"
```

Modifying database parameters

Amazon RDS for Db2 uses three types of parameters: database manager configuration parameters, registry variables, and database configuration parameters. You can update the first two types through parameter groups and the last type through the rdsadmin.update_db_param stored procedure.

Note

You can only modify the values of existing parameters. You can't add new parameters that RDS for Db2 doesn't support.

For more information these parameters and how to modify their values, see Amazon RDS for Db2 parameters.

Configuring log retention

To configure how long Amazon RDS retains log files for your RDS for Db2 database, call the rdsadmin.set_archive_log_retention stored procedure.

To configure log retention for a database

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_user using master_password"
```
(Optional) Check your current configuration for log retention by calling rdsadmin.show_archive_log_retention. For more information, see rdsadmin.show_archive_log_retention.
```
db2 "call rdsadmin.show_archive_log_retention(
    ?,
    'database_name')"
```
Configure log retention for the database by calling rdsadmin.set_archive_log_retention. For more information, see rdsadmin.set_archive_log_retention.
```
db2 "call rdsadmin.set_archive_log_retention(
    ?,            
    'database_name',  
    'archive_log_retention_hours')"
```

Dropping a database

To drop a database from your RDS for Db2 DB instance, call the rdsadmin.drop_database stored procedure. For more information, see Dropping databases in the IBM Db2 documentation.

Note

You can drop a database by calling the stored procedure only if certain conditions are met. For more information, see Usage notes for rdsadmin.drop_database.

To drop a database

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_user using master_password"
```
Drop a database by calling rdsadmin.drop_database. For more information, see rdsadmin.drop_database.
```
db2 "call rdsadmin.drop_database('database_name')"
```

Restoring a database

To restore a database on your RDS for Db2 DB instance, call the rdsadmin.restore_database stored procedure. For more information, see RESTORE DATABASE command in the IBM Db2 documentation.

Note

You can restore a database by calling the stored procedure if you didn't specify the name of the database when you created your RDS for Db2 DB instance by using either the Amazon RDS console or the AWS CLI. For more information, see Usage notes for rdsadmin.restore_database.

To restore a database

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_user using master_password"
```
(Optional) Check your current configuration settings to optimize the restore operation by calling rdsadmin.show_configuration. For more information, see rdsadmin.show_configuration.
```
db2 "call rdsadmin.show_configuration('name')"
```
Configure the settings to optimize the restore operation by calling rdsadmin.set_configuration. Explicitly setting these values can improve the performance when restoring databases with large volumes of data. For more information, see rdsadmin.set_configuration.
```
db2 "call rdsadmin.set_configuration(
    'name',  
    'value')"
```

Restore the database by calling rdsadmin.restore_database. For more information, see rdsadmin.restore_database.


db2 "call rdsadmin.restore_database(
    ?,
    'database_name', 
    's3_bucket_name', 
    's3_prefix', 
    restore_timestamp, 
    'backup_type')"

Bring the database back online and apply additional transaction logs by calling rdsadmin.rollforward_database. For more information, see rdsadmin.rollforward_database.
```
db2 "call rdsadmin.rollforward_database(
    ?,
    'database_name',
    's3_bucket_name', 
    s3_prefix, 
    'rollfoward_to_option', 
    'complete_rollforward')"
```
If you set complete_rollforward to FALSE in the previous step, then you must finish bringing the database back online by calling rdsadmin.complete_rollforward. For more information, see rdsadmin.complete_rollforward.
```
db2 "call rdsadmin.complete_rollforward(
    ?,
    'database_name')"
```

Collecting information about databases

To collect information about your databases, call the rdsadmin.db2pd_command stored procedure. This information can help with monitoring your databases or troubleshooting issues.

To collect information about a database

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_username using master_password"
```
Collect information about the database by calling rdsadmin.db2pd_command. For more information, see rdsadmin.db2pd_command.
```
db2 "call rdsadmin.db2pd_command('db2pd_cmd')"
```

Forcing applications off of databases

To force applications off of your RDS for Db2 databases, call the rdsadmin.force_application stored procedure. Before you perform maintenance on your databases, force applications off of your databases.

To force applications off of a database

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_username using master_password"
```
Force applications off of a database by calling rdsadmin.force_application. For more information, see rdsadmin.force_application.
```
db2 "call rdsadmin.force_application(     
    ?,
    'applications')"
```

Generating performance reports

You can generate performance reports with a procedure or a script. For information about using a procedure, see DBSUMMARY procedure ‐ Generate a summary report of system and application performance metrics in the IBM Db2 documentation.

Db2 includes a db2mon.sh file in its ~sqllib/sample/perf directory. Running the script produces a low-cost, extensive SQL metrics report. To download the db2mon.sh file and related script files, see the perf directory in the IBM db2-samples GitHub repository.

To generate performance reports with the script

Connect to your Db2 database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 connect to rdsadmin user master_username using master_password
```
Create a buffer pool named db2monbp with a page size of 4096 by calling rdsadmin.create_bufferpool. For more information, see rdsadmin.create_bufferpool.
```
db2 "call rdsadmin.create_bufferpool('database_name','db2monbp',4096)"
```
Create a temporary tablespace named db2montmptbsp that uses the db2monbp buffer pool by calling rdsadmin.create_tablespace. For more information, see rdsadmin.create_tablespace.
```
db2 "call rdsadmin.create_tablespace('database_name',\
    'db2montmptbsp','db2monbp',4096,1000,100,'T')"
```
Open the db2mon.sh script, and modify the line about connecting to a database.
1. Remove the following line.
```
db2 -v connect to $dbName
```
2. Replace the line in the previous step with the following line. In the following example, replace master_username and master_password with the master username and master password for your RDS for Db2 DB instance.
```
db2 -v connect to $dbName user master_username using master_password
```
3. Remove the following lines.
```
db2 -v create bufferpool db2monbp

db2 -v create user temporary tablespace db2montmptbsp bufferpool db2monbp

db2 -v drop tablespace db2montmptbsp

db2 -v drop bufferpool db2monbp
```
Run the db2mon.sh script to output a report at specified intervals. In the following example, replace absolute_path with the complete path to the script file, rds_database_alias with the name of your database, and seconds with the number of seconds (0 to 3600) between report generation.
```
absolute_path/db2mon.sh rds_database_alias seconds | tee -a db2mon.out
```
Examples

The following example shows that the script file is located in the perf directory under the home directory.
```
/home/db2inst1/sqllib/samples/perf/db2mon.sh rds_database_alias seconds | tee -a db2mon.out
```
Drop the buffer pool and the tablespace that were created for the db2mon.sh file. In the following example, replace master_username and master_password with the master username and master password for your RDS for Db2 DB instance. Replace database_name with the name of your database.
```
db2 connect to rdsadmin user master_username using master_password

db2 "call rdsadmin.drop_tablespace('database_name','db2montmptbsp')"

db2 "call rdsadmin.drop_bufferpool('database_name','db2monbp')"
```

Managing storage

Db2 uses automatic storage to manage the physical storage for database objects such as tables, indexes, and temporary files. Instead of manually allocating storage space and keeping track of which storage paths are being used, automatic storage allows the Db2 system to create and manage storage paths as needed. This can simplify administration of Db2 databases and reduce the likelihood of errors due to human mistakes. For more information, see Automatic storage in the IBM Db2 documentation.

With RDS for Db2, you can dynamically increase the storage size with automatic expansion of the logical volumes and the file system. For more information, see Working with storage for Amazon RDS DB instances.

Managing tablespaces

You can create, alter, rename, or drop tablespaces for an RDS for Db2 database. Creating, altering, renaming, or dropping tablespaces requires higher-level SYSADM authority, which isn't available to the master user. Instead, use Amazon RDS stored procedures.

Topics

Creating a tablespace
Altering a tablespace
Renaming a tablespace
Dropping a tablespace
Checking the status of a tablespace
Returning detailed information about tablespaces
Listing the state and storage group for a tablespace
Listing the tablespaces of a table
Listing tablespace containers

Creating a tablespace

To create a tablespace for your RDS for Db2 database, call the rdsadmin.create_tablespace stored procedure. For more information, see CREATE TABLESPACE statement in the IBM Db2 documentation.

Important

To create a tablespace, you must have a buffer pool of the same page size to associate with the tablespace. For more information, see Managing buffer pools.

To create a tablespace

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_username using master_password"
```

Create a tablespace by calling rdsadmin.create_tablespace. For more information, see rdsadmin.create_tablespace.


db2 "call rdsadmin.create_tablespace(
    'database_name', 
    'tablespace_name',
    'buffer_pool_name', 
    tablespace_initial_size, 
    tablespace_increase_size, 
    'tablespace_type')"

Altering a tablespace

To alter a tablespace for your RDS for Db2 database, call the rdsadmin.alter_tablespace stored procedure. You can use this stored procedure to change the buffer pool of a tablespace, lower the high water mark, or bring a tablespace online. For more information, see ALTER TABLESPACE statement in the IBM Db2 documentation.

To alter a tablespace

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_username using master_password"
```

Alter a tablespace by calling rdsadmin.alter_tablespace. For more information, see rdsadmin.alter_tablespace.


db2 "call rdsadmin.alter_tablespace(
    'database_name', 
    'tablespace_name', 
    'buffer_pool_name', 
    buffer_pool_size, 
    tablespace_increase_size, 
    'max_size', 'reduce_max', 
    'reduce_stop', 
    'reduce_value', 
    'lower_high_water', 
    'lower_high_water_stop', 
    'switch_online')"

Renaming a tablespace

To change the name of a tablespace for your RDS for Db2 database, call the rdsadmin.rename_tablespace stored procedure. For more information, see RENAME TABLESPACE statement in the IBM Db2 documentation.

To rename a tablespace

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_username using master_password"
```
Rename a tablespace by calling rdsadmin.rename_tablespace. For more information, including restrictions on what you can name a tablespace, see rdsadmin.rename_tablespace.
```
db2 "call rdsadmin.rename_tablespace(
    'database_name', 
    'source_tablespace_name',
    'target_tablespace_name')"
```

Dropping a tablespace

To drop a tablespace for your RDS for Db2 database, call the rdsadmin.drop_tablespace stored procedure. Before you drop a tablespace, first drop any objects in the tablespace such as tables, indexes, or large objects (LOBs). For more information, see Dropping table spaces in the IBM Db2 documentation.

To drop a tablespace

Connect to the rdsadmin database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace master_username and master_password with your own information.
```
db2 "connect to rdsadmin user master_username using master_password"
```
Drop a tablespace by calling rdsadmin.drop_tablespace. For more information, see rdsadmin.drop_tablespace.
```
db2 "call rdsadmin.drop_tablespace(
    'database_name', 
    'tablespace_name')"
```

Checking the status of a tablespace

You can check the status of a tablespace by using the cast function.

To check the status of a tablespace

Connect to your Db2 database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace rds_database_alias, master_username, and master_password with your own information.
```
db2 connect to rds_database_alias user master_username using master_password
```

Return a summary output.

For a summary output:


db2 "select cast(tbsp_id as smallint) as tbsp_id,
cast(tbsp_name as varchar(35)) as tbsp_name,
cast(tbsp_type as varchar(3)) as tbsp_type,
cast(tbsp_state as varchar(10)) as state,
cast(tbsp_content_type as varchar(8)) as contents from table(mon_get_tablespace(null,-1)) order by tbsp_id"

Returning detailed information about tablespaces

You can return information about a tablespace for one member or all members by using the cast function.

To return detailed information about tablespaces

Connect to your Db2 database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace rds_database_alias, master_username, and master_password with your own information.
```
db2 connect to rds_database_alias user master_username using master_password
```

Return details about all tablespaces in the database for one member or for all members.

For one member:


db2 "select cast(member as smallint) as member,
cast(tbsp_id as smallint) as tbsp_id,
cast(tbsp_name as varchar(35)) as tbsp_name,
cast(tbsp_type as varchar(3)) as tbsp_type,
cast(tbsp_state as varchar(10)) as state,
cast(tbsp_content_type as varchar(8)) as contents,
cast(tbsp_total_pages as integer) as total_pages,
cast(tbsp_used_pages as integer) as used_pages,
cast(tbsp_free_pages as integer) as free_pages,
cast(tbsp_page_top as integer) as page_hwm,
cast(tbsp_page_size as integer) as page_sz,
cast(tbsp_extent_size as smallint) as extent_sz,
cast(tbsp_prefetch_size as smallint) as prefetch_sz,
cast(tbsp_initial_size as integer) as initial_size,
cast(tbsp_increase_size_percent as smallint) as increase_pct,
cast(storage_group_name as varchar(12)) as stogroup from table(mon_get_tablespace(null,-1)) order by member, tbsp_id "

For all members:


db2 "select cast(member as smallint) as member
cast(tbsp_id as smallint) as tbsp_id,
cast(tbsp_name as varchar(35)) as tbsp_name,
cast(tbsp_type as varchar(3)) as tbsp_type,
cast(tbsp_state as varchar(10)) as state,
cast(tbsp_content_type as varchar(8)) as contents,
cast(tbsp_total_pages as integer) as total_pages,
cast(tbsp_used_pages as integer) as used_pages,
cast(tbsp_free_pages as integer) as free_pages,
cast(tbsp_page_top as integer) as page_hwm,
cast(tbsp_page_size as integer) as page_sz,
cast(tbsp_extent_size as smallint) as extent_sz,
cast(tbsp_prefetch_size as smallint) as prefetch_sz,
cast(tbsp_initial_size as integer) as initial_size,
cast(tbsp_increase_size_percent as smallint) as increase_pct,
cast(storage_group_name as varchar(12)) as stogroup from table(mon_get_tablespace(null,-2)) order by member, tbsp_id "

Listing the state and storage group for a tablespace

You can list the state and storage group for a tablespace by running a SQL statement.

To list the state and storage group for a tablespace, run the following SQL statement:


db2 "SELECT varchar(tbsp_name, 30) as tbsp_name,
                  varchar(TBSP_STATE, 30) state,
                  tbsp_type,
                  varchar(storage_group_name,30) storage_group
FROM TABLE(MON_GET_TABLESPACE('',-2)) AS t"

Listing the tablespaces of a table

You can list the tablespaces for a table by running a SQL statement.

To list the tablespaces of a table, run the following SQL statement. In the following example, replace SCHEMA_NAME and TABLE_NAME with the names of your schema and table:


db2 "SELECT 
   VARCHAR(SD.TBSPACE,30) AS DATA_SPACE,
   VARCHAR(SL.TBSPACE,30) AS LONG_SPACE,
   VARCHAR(SI.TBSPACE,30) AS INDEX_SPACE
 FROM 
   SYSCAT.DATAPARTITIONS P 
   JOIN SYSCAT.TABLESPACES SD ON SD.TBSPACEID = P.TBSPACEID 
   LEFT JOIN SYSCAT.TABLESPACES SL ON SL.TBSPACEID = P.LONG_TBSPACEID
   LEFT JOIN SYSCAT.TABLESPACES SI ON SI.TBSPACEID = P.INDEX_TBSPACEID
 WHERE
    TABSCHEMA = 'SCHEMA_NAME'
 AND TABNAME   = 'TABLE_NAME'"

Listing tablespace containers

You can list all tablespace containers or specific tablespace containers by using the cast command.

To list the tablespace containers for a tablespace

Connect to your Db2 database using the master username and master password for your RDS for Db2 DB instance. In the following example, replace rds_database_alias, master_username, and master_password with your own information:
```
db2 connect to rds_database_alias user master_username using master_password
```

Return a list of all tablespace containers in the database or specific tablespace containers.

For all tablespace containers:


db2 "select cast(member as smallint) as member,
cast(tbsp_name as varchar(35)) as tbsp_name,
cast(container_id as smallint) as id,
cast(container_name as varchar(60)) as container_path, container_type as type from table(mon_get_container(null,-2)) order by member,tbsp_id,container_id"

For specific tablespace containers:


db2 "select cast(member as smallint) as member,
cast(tbsp_name as varchar(35)) as tbsp_name,
cast(container_id as smallint) as id,
cast(container_name as varchar(60)) as container_path, container_type as type from table(mon_get_container('TBSP_1',-2)) order by member, tbsp_id,container_id"

Warning Javascript is disabled or is unavailable in your browser.

To use the Amazon Web Services Documentation, Javascript must be enabled. Please refer to your browser's Help pages for instructions.

Document Conventions

System tasks

Amazon S3 integration