[#2418] Addressed all 'four database' occurrences

21 files changed, 22 insertions, 22 deletions

diff --git a/doc/examples/kea4/advanced.json b/doc/examples/kea4/advanced.json
index bbbd7d4825..652acddafd 100644
--- a/doc/examples/kea4/advanced.json
+++ b/doc/examples/kea4/advanced.json
@@ -73,7 +73,7 @@
     } ],
 
     // We need to specify the database used to store leases. As of
-    // September 2016, four database backends are supported: MySQL,
+    // June 2022, three database backends are supported: MySQL,
     // PostgreSQL and the in-memory database, Memfile.
     // We'll use memfile  because it doesn't require any prior set up.
     // For memfile, it's important to always specify lfc-interval, so
diff --git a/doc/examples/kea4/global-reservations.json b/doc/examples/kea4/global-reservations.json
index c54ada30ec..3c579df317 100644
--- a/doc/examples/kea4/global-reservations.json
+++ b/doc/examples/kea4/global-reservations.json
@@ -14,8 +14,8 @@
     "interfaces": [ "ethX" ]
   },
 
-// We need to specify the database used to store leases. As of September
-// 2016, four database backends are supported: MySQL, PostgreSQL and
+// We need to specify the database used to store leases. As of June
+// 2022, three database backends are supported: MySQL, PostgreSQL and
 // the in-memory database, Memfile.  We'll use memfile because it doesn't
 // require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea4/leases-expiration.json b/doc/examples/kea4/leases-expiration.json
index ea86a43d6c..ca4b3db05b 100644
--- a/doc/examples/kea4/leases-expiration.json
+++ b/doc/examples/kea4/leases-expiration.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
 // Note, we're setting the maximum number of row read errors to 100,
diff --git a/doc/examples/kea4/multiple-options.json b/doc/examples/kea4/multiple-options.json
index 3c791c2feb..925ef3bbd2 100644
--- a/doc/examples/kea4/multiple-options.json
+++ b/doc/examples/kea4/multiple-options.json
@@ -10,7 +10,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea4/mysql-reservations.json b/doc/examples/kea4/mysql-reservations.json
index 5286d8938e..86a7accbcb 100644
--- a/doc/examples/kea4/mysql-reservations.json
+++ b/doc/examples/kea4/mysql-reservations.json
@@ -12,7 +12,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea4/pgsql-reservations.json b/doc/examples/kea4/pgsql-reservations.json
index 3999e6dac4..ebd101b3f0 100644
--- a/doc/examples/kea4/pgsql-reservations.json
+++ b/doc/examples/kea4/pgsql-reservations.json
@@ -12,7 +12,7 @@
 
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea4/several-subnets.json b/doc/examples/kea4/several-subnets.json
index a1935ea2f2..bfa58e4e47 100644
--- a/doc/examples/kea4/several-subnets.json
+++ b/doc/examples/kea4/several-subnets.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea4/single-subnet.json b/doc/examples/kea4/single-subnet.json
index ae7f0cfdf0..65a6e6c149 100644
--- a/doc/examples/kea4/single-subnet.json
+++ b/doc/examples/kea4/single-subnet.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea4/with-ddns.json b/doc/examples/kea4/with-ddns.json
index 8e76f7c548..5460d6f5b0 100644
--- a/doc/examples/kea4/with-ddns.json
+++ b/doc/examples/kea4/with-ddns.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/advanced.json b/doc/examples/kea6/advanced.json
index 3ea1c613ad..5d85adf41c 100644
--- a/doc/examples/kea6/advanced.json
+++ b/doc/examples/kea6/advanced.json
@@ -24,7 +24,7 @@
     },
 
     // We need to specify the database used to store leases. As of
-    // September 2016, four database backends are supported: MySQL,
+    // June 2022, three database backends are supported: MySQL,
     // PostgreSQL and the in-memory database, Memfile.
     // We will use memfile  because it doesn't require any prior set up.
     "lease-database": {
diff --git a/doc/examples/kea6/duid.json b/doc/examples/kea6/duid.json
index 44e8a9b009..5265606a42 100644
--- a/doc/examples/kea6/duid.json
+++ b/doc/examples/kea6/duid.json
@@ -31,7 +31,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/global-reservations.json b/doc/examples/kea6/global-reservations.json
index 986b4cb5a2..db99beb48e 100644
--- a/doc/examples/kea6/global-reservations.json
+++ b/doc/examples/kea6/global-reservations.json
@@ -15,7 +15,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/leases-expiration.json b/doc/examples/kea6/leases-expiration.json
index 12f754e558..a20d5e126f 100644
--- a/doc/examples/kea6/leases-expiration.json
+++ b/doc/examples/kea6/leases-expiration.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
 // Note, we're setting the maximum number of row read errors to 100,
diff --git a/doc/examples/kea6/multiple-options.json b/doc/examples/kea6/multiple-options.json
index 0abeba0227..a22559e67f 100644
--- a/doc/examples/kea6/multiple-options.json
+++ b/doc/examples/kea6/multiple-options.json
@@ -10,7 +10,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/mysql-reservations.json b/doc/examples/kea6/mysql-reservations.json
index 1b4a9d8752..0553dad2e5 100644
--- a/doc/examples/kea6/mysql-reservations.json
+++ b/doc/examples/kea6/mysql-reservations.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/pgsql-reservations.json b/doc/examples/kea6/pgsql-reservations.json
index 4656541d42..e27d4d5157 100644
--- a/doc/examples/kea6/pgsql-reservations.json
+++ b/doc/examples/kea6/pgsql-reservations.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/reservations.json b/doc/examples/kea6/reservations.json
index 2460deb1a1..252b5410b5 100644
--- a/doc/examples/kea6/reservations.json
+++ b/doc/examples/kea6/reservations.json
@@ -13,7 +13,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/several-subnets.json b/doc/examples/kea6/several-subnets.json
index b3f0b1ead5..5891836f35 100644
--- a/doc/examples/kea6/several-subnets.json
+++ b/doc/examples/kea6/several-subnets.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/simple.json b/doc/examples/kea6/simple.json
index 8f1b7522ad..83953a112d 100644
--- a/doc/examples/kea6/simple.json
+++ b/doc/examples/kea6/simple.json
@@ -12,7 +12,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/tee-times.json b/doc/examples/kea6/tee-times.json
index d5f80f4c09..d3b969adc7 100644
--- a/doc/examples/kea6/tee-times.json
+++ b/doc/examples/kea6/tee-times.json
@@ -11,7 +11,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {
diff --git a/doc/examples/kea6/with-ddns.json b/doc/examples/kea6/with-ddns.json
index 3506483a08..e611d51123 100644
--- a/doc/examples/kea6/with-ddns.json
+++ b/doc/examples/kea6/with-ddns.json
@@ -12,7 +12,7 @@
   },
 
 // We need to specify the database used to store leases. As of
-// September 2016, four database backends are supported: MySQL,
+// June 2022, three database backends are supported: MySQL,
 // PostgreSQL and the in-memory database, Memfile.
 // We'll use memfile  because it doesn't require any prior set up.
   "lease-database": {