Oracle 12c新特性维护表分区Global Index不失效

# update indexes更新所有索引，global 或者local，而当使用update indexes更新global index时，不能指定子句， # update global indexes只能用于global indexes TEST@czhpdb1 > alter table test_part drop partition p2 update indexes;       Table altered. # 可以看到索引并没有失效，但是NUM_ROWS并未发生改变，也就是索引并未被实时更新 TEST@czhpdb1 > select table_name,index_name,status,num_rows from user_indexes where table_name='TEST_PART'; TABLE_NAME                               INDEX_NAME           STATUS                                     NUM_ROWS ---------------------------------------- -------------------- ---------- ---------------------------------------- TEST_PART                                IDX_TEST_PART        VALID                                          5001 # 可以看到产生了延迟GLOBAL INDEX MAINTAINE的定时任务，默认凌晨两点开始自动执行维护global index col job_name for a50 col LAST_START_DATE for a40 col NEXT_RUN_DATE for a40 select JOB_NAME,LAST_START_DATE,NEXT_RUN_DATE from DBA_SCHEDULER_JOBS where JOB_NAME='PMO_DEFERRED_GIDX_MAINT_JOB'; JOB_NAME                                           LAST_START_DATE                          NEXT_RUN_DATE -------------------------------------------------- ---------------------------------------- ---------------------------------------- PMO_DEFERRED_GIDX_MAINT_JOB                        06-JAN-20 03.06.37.673278 AM PST8PDT     07-JAN-20 02.00.00.679539 AM PST8PDT    # user_indexes视图orphaned_entries字段标识global index是否包含索引延迟维护的过期条目 TEST@czhpdb1 > select table_name,index_name,status,num_rows,orphaned_entries from user_indexes where table_name='TEST_PART'; TABLE_NAME                               INDEX_NAME           STATUS                                     NUM_ROWS ORPHANED_ ---------------------------------------- -------------------- ---------- ---------------------------------------- --------- TEST_PART                                IDX_TEST_PART        VALID                                          5001 YES

# 通过调用系统包DBMS_PART.CLEANUP_GIDX col job_name for a50 col LAST_START_DATE for a40 col NEXT_RUN_DATE for a40 select JOB_NAME,LAST_START_DATE,NEXT_RUN_DATE from DBA_SCHEDULER_JOBS where JOB_NAME='PMO_DEFERRED_GIDX_MAINT_JOB'; JOB_NAME                                           LAST_START_DATE                          NEXT_RUN_DATE -------------------------------------------------- ---------------------------------------- ---------------------------------------- PMO_DEFERRED_GIDX_MAINT_JOB                        06-JAN-20 03.06.37.673278 AM PST8PDT     07-JAN-20 02.00.00.679539 AM PST8PDT    SYS@czh29c > exec DBMS_PART.CLEANUP_GIDX('TEST','TEST_PART'); PL/SQL procedure successfully completed. TEST@czhpdb1 > select table_name,index_name,status,num_rows,orphaned_entries from user_indexes where table_name='TEST_PART'; TABLE_NAME                               INDEX_NAME           STATUS                                     NUM_ROWS ORPHANED_ ---------------------------------------- -------------------- ---------- ---------------------------------------- --------- TEST_PART                                IDX_TEST_PART        VALID                                          5001 NO

# 使用sys连接数据库时，一定要注意切换pdb，只有切换到正确的pdb，才能正确的执行调度定时任务完成相应维护操作 SYS@czh29c > alter session set container=czhpdb1; Session altered. SYS@czh29c > show pdbs;                                   CON_ID CON_NAME                       OPEN MODE  RESTRICTED ---------------------------------------- ------------------------------ ---------- ----------                                        3 CZHPDB1                        READ WRITE NO                                         # 查询DBA_SCHEDULER_JOBS，查看调度任务 SYS@czh29c > col job_name for a50 SYS@czh29c > col LAST_START_DATE for a40 SYS@czh29c > col NEXT_RUN_DATE for a40 SYS@czh29c > select JOB_NAME,LAST_START_DATE,NEXT_RUN_DATE from DBA_SCHEDULER_JOBS where JOB_NAME='PMO_DEFERRED_GIDX_MAINT_JOB'; JOB_NAME                                           LAST_START_DATE                          NEXT_RUN_DATE -------------------------------------------------- ---------------------------------------- ---------------------------------------- PMO_DEFERRED_GIDX_MAINT_JOB                        06-JAN-20 03.06.37.606301 AM PST8PDT     07-JAN-20 02.00.00.609298 AM PST8PDT # 手工执行调度任务 SYS@czh29c > exec dbms_scheduler.run_job('PMO_DEFERRED_GIDX_MAINT_JOB'); PL/SQL procedure successfully completed. # 查看global index状态，已经被维护 TEST@czhpdb1 > select table_name,index_name,status,num_rows,orphaned_entries from user_indexes where table_name='TEST_PART'; TABLE_NAME                               INDEX_NAME           STATUS                                     NUM_ROWS ORPHANED_ ---------------------------------------- -------------------- ---------- ---------------------------------------- --------- TEST_PART                                IDX_TEST_PART        VALID                                          5001 NO

# 可以rebuild启用并行parallel，rebuild完毕之后，使用alter index no paralle，关闭并行度 TEST@czhpdb1 > alter index idx_test_part rebuild online; Index altered. TEST@czhpdb1 > select table_name,index_name,status,num_rows,orphaned_entries from user_indexes where table_name='TEST_PART'; TABLE_NAME                               INDEX_NAME           STATUS                                     NUM_ROWS ORPHANED_ ---------------------------------------- -------------------- ---------- ---------------------------------------- --------- TEST_PART                                IDX_TEST_PART        VALID                                         10003 NO

# COALESCE # Specify this clause to merge the contents of index partition blocks where possible # to free blocks for reuse. # CLEANUP # Specify CLEANUP to remove orphaned index entries for records that were previously # dropped or truncated by a table partition maintenance operation. # To determine whether an index partition contains orphaned index entries, you can # query the ORPHANED_ENTRIES column of the USER_, DBA_, ALL_PART_INDEXES # data dictionary views. Refer to Oracle Database Reference for more information TEST@czhpdb1 > alter index idx_test_part coalesce cleanup; Index altered. TEST@czhpdb1 > select table_name,index_name,status,num_rows,orphaned_entries from user_indexes where table_name='TEST_PART'; TABLE_NAME                               INDEX_NAME           STATUS                                     NUM_ROWS ORPHANED_ ---------------------------------------- -------------------- ---------- ---------------------------------------- --------- TEST_PART                                IDX_TEST_PART        VALID                                         10003 NO