● Tablespace: (TABLESPACE) Specifies the name of the tablespace where the index is stored.
● Initial Transactions: (INITTRANS) Specifies the number of DML transactions for which space is initially reserved in the data block header. Oracle stores control information in the data block to indicate which rows in the block contain committed and uncommitted changes. The amount of history that is retained is controlled by this parameter. If too many transactions concurrently modify the same data block in a very short period, Oracle may not have sufficient history information to determine whether a row has been updated by a “too recent” transaction. Specify a higher value for indexes that may experience many transactions updating the same blocks.
● Max Transactions: (MAXTRANS) Once the space reserved by INITRANS is depleted, space for additional transaction entries is allocated out of any available free space. Once allocated, this space effectively becomes a permanent part of the block header. This parameter limits the number of transaction entries that can concurrently use data in a data block and therefore limits the amount of free space that can be allocated for transaction entries in a data block.
● Percent Free: (PCTFREE) Specifies the maximum percentage of space in each data block to reserve for future updates. This reserved space helps to avoid row migration and chaining caused by an update operation that extends a data row's length. Tables that won’t be updated should have this value set to 0.
● Initial Extent: (INITEXTENT) Specifies the initial number of data blocks that Oracle should reserve. Oracle will reserve the number of data blocks that correspond to the initial extent for that table’s rows.
● Next Extent: (NEXT) Specifies the size in kilobytes of the next extent. You should monitor this figure against the largest available chunk of free space in the tablespace. If a table cannot allocate its next extent, it will no longer be able to extend and, therefore, cannot accept additional data.
● Percent Increase: (PCTINCREASE) Specifies the percentage by which the next extent should grow over the previous extent's size. Be careful when setting Percent Increase because it magnifies how an object grows and, therefore, can materially affect available free space in a tablespace.
● Min Extents: (MINEXTENTS) Specifies the number of extents to allocate when the segment is created. Controls free space fragmentation by making sure that every used or free extent is at least as large as the value you specify.
● Max Extents: (STORAGE (MAXEXTENTS)) Species the maximum number of extents that Oracle can allocate to the index. Once this limit is reached, Oracle prevents further growth of the cluster and cannot accept additional data. Carefully monitor the number extents already allocated to the index with this limit.