Performing common database tasks for Amazon RDS for Db2 DB instances
You can perform certain common DBA tasks related to databases on your 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.
Topics
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 SYSADMIN
authority, which isn't
available to the master user. Instead, use Amazon RDS stored procedures.
You can also flush 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
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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_user
usingmaster_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
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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_username
usingmaster_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
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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_user
usingmaster_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
, andmaster_password
with your own information.db2 connect to
rds_database_alias
usermaster_username
usingmaster_password
-
Flush the buffer pools.
db2 flush bufferpools all
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
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
To create a tablespace for your RDS for Db2 database, call the
rdsadmin.create_tablespace
stored procedure. For more information, see
CREATE TABLESPACE statement
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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_username
usingmaster_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
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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_username
usingmaster_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.
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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_username
usingmaster_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
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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_username
usingmaster_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
command.
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
, andmaster_password
with your own information.db2 connect to
rds_database_alias
usermaster_username
usingmaster_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
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
, andmaster_password
with your own information.db2 connect to
rds_database_alias
usermaster_username
usingmaster_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
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
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
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
, andmaster_password
with your own information:db2 connect to
rds_database_alias
usermaster_username
usingmaster_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"
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
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
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
andmaster_password
with your own information.db2 connect to rdsadmin
master_username
usingmaster_password
-
Create a buffer pool named
db2monbp
with a page size of 4096 by callingrdsadmin.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 thedb2monbp
buffer pool by callingrdsadmin.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.-
Remove the following line.
db2 -v connect to $dbName
-
Replace the line in the previous step with the following line. In the following example, replace
master_username
andmaster_password
with the master username and master password for your RDS for Db2 DB instance.db2 -v connect to $dbName user
master_username
usingmaster_password
-
-
Change to the directory where the script is located. In the following example, replace
directory
with the name of the directory where the script is located.cd
directory
-
Run the
db2mon.sh
script to output a report at specified intervals. In the following example, replacerds_database_alias
andseconds
with the name of your database and the number of seconds (0 to 3600) between report generation../db2mon.sh
rds_database_alias
seconds
| tee -a db2mon.out
Collecting information about databases
You can use an Amazon RDS stored procedure to collect information about your databases. 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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_username
usingmaster_password
" -
Collect information by calling
rdsadmin.db2pd
. For more information, see rdsadmin.db2pd_command.db2 "call rdsadmin.db2pd_command('
db2pd_cmd
')"
Forcing applications off of databases
You can use an Amazon RDS stored procedure to force applications off of your RDS for Db2 databases to allow for maintenance of the 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, replacemaster_username
andmaster_password
with your own information.db2 "connect to rdsadmin user
master_username
usingmaster_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
')"