Merge pull request #1820 from oracle-devrel/witold-swierzy-patch-4

Witold swierzy patch 4

Author: JesusGitHubOracle

data-platform/autonomous-database/autonomous-json/migration_from_19c_lob_to_23ai_json_datatype/README.md

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+# Migration to JSON datatype
+
+This area provides an example of migration of JSON data from pre-23ai model, which used LOB to store JSON data to JSON datatype, which has been implemented in Oracle Database 23ai.
+
+# License
+
+Copyright (c) 2025 Oracle and/or its affiliates.
+
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See [LICENSE](https://github.com/oracle-devrel/technology-engineering/blob/main/LICENSE) for more details.

data-platform/autonomous-database/autonomous-json/migration_from_19c_lob_to_23ai_json_datatype/migration_to_json_datatype.sql

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+drop table if exists JSONFLIGHTS_COL_LARGE;
+create json collection table JSONFLIGHTS_COL_LARGE;
+
+begin
+dbms_cloud.copy_collection(collection_name => 'JSONFLIGHTS_COL_LARGE', 
+                           credential_name => 'ajd_cred', 
+                           file_uri_list   => 'https://objectstorage.eu-frankfurt-1.oraclecloud.com/n/fro8fl9kuqli/b/json_demo/o/flights-150m.json', 
+                           format => json_object('recorddelimiter' value '''\n'''));
+end;
+/
+
+drop table if exists jsonflights_col_19c;
+create table jsonflights_col_19c
+(id          varchar2(32) primary key,
+ data        clob);
+
+insert /*+parallel append */ into jsonflights_col_19c(id, data)
+select j.data."_id", j.data
+from jsonflights_col_large j
+where rownum <= 1000000;
+
+commit;
+
+alter table jsonflights_col_19c add (constraint ensure_json check(doc is json));
+
+
+
+-- migration from clob to json datatype
+ drop table if exists jsonflights_col_23ai;
+ create json collection table jsonflights_col_23ai;
+
+ begin 
+    dbms_json.json_type_convertible_check(
+                   owner => 'ORADEV',
+                   tableName => 'JSONFLIGHTS_COL_19C',
+                   columnName => 'DATA',
+                   statusTableName => 'CHECK_TABLE');
+ end;
+
+ select * from check_table;
+
+ insert /*+ parallel append */
+ into jsonflights_col_23ai (data)
+ select json(data)
+ from jsonflights_col_19c;
+
+ commit;
+
+ begin
+    dbms_stats.gather_table_stats('ORADEV','JSONFLIGHTS_COL_19C');
+    dbms_stats.gather_table_stats('ORADEV','JSONFLIGHTS_COL_23AI');
+ end;
+
+ select *
+ from user_tables
+ where table_name in ('JSONFLIGHTS_COL_19C','JSONFLIGHTS_COL_23AI');
+
+
+select json_serialize(data pretty) as data from jsonflights_col_23ai;
+
+select json_serialize(data pretty) as data from jsonflights_col_19c;
+
+select json_serialize(data pretty) as data from jsonflights_col_23ai j
+where j.data."DEP_DELAY" > 12
+
+select json_serialize(data pretty) as data from jsonflights_col_19c j
+where j.data."DEP_DELAY" > 12