Preinstallation for an Overlay Installation

Learn how to execute an overlay installation.

Verify that your current Adaptive Server is one of the releases prior to the version you are installing. In isql enter:
```
1> select @@version
2> go
```
If your server is not running, enter:
```
$SYBASE/$SYBASE_ASE/bin/dataserver -v
```
Warning!
Your software needs to be at a version lower than the version you are installing prior to applying this EBF.
Installing Adaptive Server version 15.0.3 overwrites the current Adaptive Server. Prior to installing Adaptive Server version 15.0.3, make sure that your databases are error free and back up your %SYBASE% directory, in case you need to return to the original version of the software.
To ensure that your database is error free, run dbcc checkdb, dbcc checkcatalog and dbcc checkstorage prior to installing any new Adaptive Server binaries including the master database.

If any of the dbcc commands reveal problems, stop here and see the Troubleshooting and Error Messages Guide for more information.
If you are installing Adaptive Server 15.0.3 over an existing Adaptive Server 15.0.x version then, if Java in database feature is enabled, perform the following steps:
- Create the sybpcidb database
  The sybpcidb database stores configuration information for the PCI and all PCA components. This database is used by the installpcidb script. For example:
```
1> disk init
2> name = “sybpcidb_dev”
3> physname = “${SYBASE}/data/sybpcidb_dev.dat”
4> size = '24MB'
5> go
1> create database sybpcidb on sybpcidb_dev = 24
2> go
```
  The device and database sizes depend on the Adaptive Server pagesize:
  - 2k pagesize - 24MB
  - 4k pagesize - 48MB
  - 8k pagesize - 96MB
  - 16k pagesize - 192MB
  If you are upgrading from a 15.0.x ASE, disable java feature before the upgrade and enable after the upgrade is complete.
- Disable java feature:
```
1> sp_configure 'enable java', 0
2> go
```

Note:

If you plan to use sqlupgrade utility to upgrade from a pre-15.0.x Adaptive Server, do not disable Java in database feature. The sqlupgrade utility will automatically disable and re-enable Java feature.