CREATE-POLICY

CREATE-POLICY

Name

CREATE POLICY

Description

Create policies,such as:

1. Create security policies(ROW POLICY) and explain to view the rewritten SQL.
2. Create storage migration policy(STORAGE POLICY), used for cold and hot data transform

Grammar:

1. ROW POLICY

CREATE ROW POLICY test_row_policy_1 ON test.table1 
AS {RESTRICTIVE|PERMISSIVE} TO test USING (id in (1, 2));

illustrate：

• filterType：It is usual to constrict a set of policies through AND. PERMISSIVE to constrict a set of policies through OR
• Configure multiple policies. First, merge the RESTRICTIVE policy with the PERMISSIVE policy
• It is connected with AND between RESTRICTIVE AND PERMISSIVE
• It cannot be created for users root and admin

2. STORAGE POLICY

CREATE STORAGE POLICY test_storage_policy_1
PROPERTIES ("key"="value", ...);

illustrate：

• PROPERTIES has such keys:
  1. storage_resource：storage resource name for policy
  2. cooldown_datetime：cool down time for tablet, can't be set with cooldown_ttl.
  3. cooldown_ttl：hot data stay time. The time cost between the time of tablet created and the time of migrated to cold data, formatted as： 1d：1 day 1h：1 hour 50000: 50000 second

Example

1. Create a set of row security policies

   CREATE ROW POLICY test_row_policy_1 ON test.table1 
   AS RESTRICTIVE TO test USING (c1 = 'a');

   CREATE ROW POLICY test_row_policy_2 ON test.table1 
   AS RESTRICTIVE TO test USING (c2 = 'b');

   CREATE ROW POLICY test_row_policy_3 ON test.table1 
   AS PERMISSIVE TO test USING (c3 = 'c');

   CREATE ROW POLICY test_row_policy_3 ON test.table1 
   AS PERMISSIVE TO test USING (c4 = 'd');

   When we execute the query on Table1, the rewritten SQL is

   select * from (select * from table1 where c1 = 'a' and c2 = 'b' or c3 = 'c' or c4 = 'd')

2. Create policy for storage

   1. NOTE
      • To create a cold hot separation policy, you must first create a resource, and then associate the created resource name when creating a migration policy
      • Currently, the drop data migration policy is not supported to prevent data from being migrated. If the policy has been deleted, then the system cannot retrieve the data
   2. Create policy on cooldown_datetime

   CREATE STORAGE POLICY testPolicy
   PROPERTIES(
     "storage_resource" = "s3",
     "cooldown_datetime" = "2022-06-08 00:00:00"
   );
   3. Create policy on cooldown_ttl

   CREATE STORAGE POLICY testPolicy
   PROPERTIES(
     "storage_resource" = "s3",
     "cooldown_ttl" = "1d"
   );

   Relevant parameters are as follows:

   • storage_resource: the storage resource of create
   • cooldown_datetime: Data migration time
   • cooldown_ttl: Countdown of the distance between the migrated data and the current time

Keywords

CREATE, POLICY

Best Practice