Chapter 1: Commands

reorg

Description

Reclaims unused space on pages, removes row forwarding, or rewrites all rows in the table to new pages, depending on the option used.

Syntax

reorg forwarded_rows table_name [partition partition_name] 
	[with {resume, time = no_of_minutes}]

reorg reclaim_space table_name [index_name] [partition partition_name]
	[with {resume, time = no_of_minutes}]

reorg compact table_name [partition partition_name]
	[with {resume, time = no_of_minutes}]reorg rebuild table_name [index_name  [partition index_partition_name]]

Parameters

reclaim_space: reclaims unused space left by deletes and updates. For each data page in a table, if there is unused space resulting from committed deletes or row-shortening updates, reorg reclaim_space rewrites the current rows contiguously, leaving all unused space at the end of the page. If there are no rows on the page, the page is deallocated.

tablename: specifies the name of the table to be reorganized. If indexname is specified, only the index is reorganized.

indexname: specifies the name of the index to be reorganized.

partition_name: is the name of the partition on which you are running reorg.

index_partition_name: is the name of the index partition on which you are running reorg. update statistics peforms a check to validate that index_partition_name is an index partition.

with resume: initiates reorganization from the point at which a previous reorg command terminated. Used when the previous reorg command specified a time limit (with time = no_of_minutes).

with time = no_of_minutes: specifies the number of minutes that the reorg command is to run.

forwarded_rows: removes row forwarding.

compact: combines the functions of reorg reclaim_space and reorg forwarded_rows to both reclaim space and undo row forwarding in the same pass.

rebuild: if a table name is specified, rewrites all rows in a table to new pages, so that the table is arranged according to its clustered index (if one exists), with all pages conforming to current space management settings and with no forwarded rows and no gaps between rows on a page. If the table has an index, all indexes are dropped and re-created. If an index name is specified, reorg rebuilds that index while leaving the table accessible for read and update activities.

Examples

Example 1

Reclaims unused page space in the titles table:

reorg reclaim_space titles

Example 2

Reclaims unused page space in the index titleind:

reorg reclaim_space titles titleind

Example 3

Initiates reorg compact on the titles table. reorg starts at the beginning of the table and continues for 120 minutes. If the reorg completes within the time limit, it returns to the beginning of the table and continues until the full time period has elapsed:

reorg compact titles with time = 120

Example 4

Initiates reorg compact at the point where the previous reorg compact stopped and continues for 30 minutes:

reorg compact titles with resume, time = 30

Example 5

Runs reorg forwarded_rows on the smallsales partition of the titles table:

reorg forwarded_rows titles partition smallsales

Example 6

Runs reorg forwarded_rows on the authors table:

reorg forwarded_rows authors

Example 7

Runs reorg reclaim_space on the bigsales partition of titles:

reorg reclaim_space titles partition bigsales

Example 8

Runs reorg compact on the bigsales partition of titles:

reorg compact titles partition bigsales

Example 9

Runs reorg rebuild on the index partition idx_p2 of index local_idx on table sales:

reorg rebuild sales local_idx partition idx_p2

Usage

The table specified in reorg—excluding reorg rebuild—must have a datarows- or datapages-locking scheme.
You cannot issue reorg within a transaction.
reorg rebuild requires that you set the database option select into/bulkcopy/pllsort to true and run checkpoint in the database.
reorg rebuild requires additional disk space equal to the size of the table and its indexes. You can find out how much space a table currently occupies by using sp_spaceused. You can use sp_helpsegment to check the amount of space available.
After running reorg rebuild, you must dump the database before you can dump the transaction log.

Standards

ANSI SQL – Compliance level: Transact-SQL extension.

Permissions

You must be a System Administrator or the object owner to issue the reorg command.