Mantis#2591. Thank you kindly, Ruud Lathrop for a patch that:

This patch is two script that fixes a issue when adding more 
then 1 avatar to estateban/estatemanager list. It removes a 
key and adds a index to the tables. 

1 files changed, 25 insertions, 0 deletions

diff --git a/OpenSim/Data/MSSQL/Resources/003_EstateStore.sql b/OpenSim/Data/MSSQL/Resources/003_EstateStore.sql
new file mode 100644
index 0000000..7dd0ec8
--- /dev/null
+++ b/OpenSim/Data/MSSQL/Resources/003_EstateStore.sql
@@ -0,0 +1,25 @@
+BEGIN TRANSACTION

+

+CREATE TABLE dbo.Tmp_estateban

+        (

+        EstateID int NOT NULL,

+        bannedUUID varchar(36) NOT NULL,

+        bannedIp varchar(16) NULL,

+        bannedIpHostMask varchar(16) NULL,

+        bannedNameMask varchar(64) NULL

+        )  ON [PRIMARY]

+

+IF EXISTS(SELECT * FROM dbo.estateban)

+         EXEC('INSERT INTO dbo.Tmp_estateban (EstateID, bannedUUID, bannedIp, bannedIpHostMask, bannedNameMask)

+                SELECT EstateID, bannedUUID, bannedIp, bannedIpHostMask, bannedNameMask FROM dbo.estateban')

+

+DROP TABLE dbo.estateban

+

+EXECUTE sp_rename N'dbo.Tmp_estateban', N'estateban', 'OBJECT' 

+

+CREATE NONCLUSTERED INDEX IX_estateban ON dbo.estateban

+        (

+        EstateID

+        ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

+

+COMMIT