Partition Table and Exadata Hybrid Columnar Compression (EHCC)
Posted
by Bandari Huang
on Oracle Blogs
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Published on Mon, 15 Oct 2012 06:19:15 +0000
Indexed on
2012/10/15
9:45 UTC
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- Create EHCC table
- CREATE TABLE ... COMPRESS FOR [QUERY LOW|QUERY HIGH|ARCHIVE LOW|ARCHIVE HIGH];
select owner,table_name,compress_for DBA_TAB_SUBPARTITIONS where compression = ‘ENABLED';
- CREATE TABLE ... COMPRESS FOR [QUERY LOW|QUERY HIGH|ARCHIVE LOW|ARCHIVE HIGH];
- Convert Table/Partition/Subpartition to EHCC
- Compress Table&Partition&Subpartition to EHCC:
ALTER TABLE table_name MOVE COMPRESS FOR [QUERY LOW|QUERY HIGH|ARCHIVE LOW|ARCHIVE HIGH] [PARALLEL <dop>];
ALTER TABLE table_name MOVE PARATITION partition_name COMPRESS FOR [QUERY LOW|QUERY HIGH|ARCHIVE LOW|ARCHIVE HIGH] [PARALLEL <dop>];
ALTER TABLE table_name MOVE SUBPARATITION subpartition_name COMPRESS FOR [QUERY LOW|QUERY HIGH|ARCHIVE LOW|ARCHIVE HIGH] [PARALLEL <dop>];
select owner,table_name,compress_for DBA_TAB_SUBPARTITIONS where compression = ‘ENABLED';
select table_owner,table_name,partition_name,compress_for DBA_TAB_PARTITIONS where compression = ‘ENABLED’;
select table_owner,table_name,subpartition_name,compress_for DBA_TAB_SUBPARTITIONS where compression = ‘ENABLED’;
- Rebuild Unusable Index:
select index_name from dba_index where status = 'UNUSABLE';
select index_name,partition_name from dba_ind_partition where status = 'UNUSABLE';
select index_name,subpartition_name from dba_ind_partition where status = 'UNUSABLE';
ALTER INDEX index_name REBUILD [PARALLEL <dop>];
ALTER INDEX index_name REBUILD PARTITION partition_name [PARALLEL <dop>];
ALTER INDEX index_name REBUILD SUBPARTITION subpartition_name [PARALLEL <dop>];
- Compress Table&Partition&Subpartition to EHCC:
- Convert Table/Partition/Subpartition from EHCC to OLTP compression or uncompressed format:
- Uncompress EHCC Table&Partition&Subpartition:
ALTER TABLE table_name MOVE [NOCOMPRESS|COMPRESS for OLTP] [PARALLEL <dop>];
ALTER TABLE table_name MOVE PARTITION partition_name [NOCOMPRESS|COMPRESS for OLTP] [PARALLEL <dop>];
ALTER TABLE table_name MOVE SUBPARTITION subpartition_name [NOCOMPRESS|COMPRESS for OLTP] [PARALLEL <dop>];
select owner,table_name,compress_for DBA_TAB_SUBPARTITIONS where compression = '';
select table_owner,table_name,partition_name,compress_for DBA_TAB_PARTITIONS where compression = '';
select table_owner,table_name,subpartition_name,compress_for DBA_TAB_SUBPARTITIONS where compression = '';
- Rebuild Unusable Index:
select index_name from dba_index where status = 'UNUSABLE';
select index_name,partition_name from dba_ind_partition where status = 'UNUSABLE';
select index_name,subpartition_name from dba_ind_partition where status = 'UNUSABLE';
ALTER INDEX index_name REBUILD [PARALLEL <dop>];
ALTER INDEX index_name REBUILD PARTITION partition_name [PARALLEL <dop>];
ALTER INDEX index_name REBUILD SUBPARTITION subpartition_name [PARALLEL <dop>];
- Uncompress EHCC Table&Partition&Subpartition:
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