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Improve export speed with an index.

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This commit is contained in:
Greyson Parrelli
2024-10-09 22:47:14 -04:00
parent dcb5015290
commit 0712503485
1 changed files with 7 additions and 1 deletions
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8
app/src/main/java/org/thoughtcrime/securesms/backup/v2/database/MessageTableArchiveExtensions.kt
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@@ -18,6 +18,12 @@ import java.util.concurrent.TimeUnit
private const val COLUMN_BASE_TYPE = "base_type" private const val COLUMN_BASE_TYPE = "base_type"
fun MessageTable.getMessagesForBackup(db: SignalDatabase, backupTime: Long, mediaBackupEnabled: Boolean): ChatItemArchiveExporter { fun MessageTable.getMessagesForBackup(db: SignalDatabase, backupTime: Long, mediaBackupEnabled: Boolean): ChatItemArchiveExporter {
// We create a temporary index on date_received to drastically speed up perf here.
// Remember that we're working on a temporary snapshot of the database, so we can create an index and not worry about cleaning it up.
val dateReceivedIndex = "message_date_received"
writableDatabase.execSQL("CREATE INDEX $dateReceivedIndex ON ${MessageTable.TABLE_NAME} (${MessageTable.DATE_RECEIVED} DESC)")
val cursor = readableDatabase val cursor = readableDatabase
.select( .select(
MessageTable.ID, MessageTable.ID,
@@ -55,7 +61,7 @@ fun MessageTable.getMessagesForBackup(db: SignalDatabase, backupTime: Long, medi
MessageTable.MESSAGE_EXTRAS, MessageTable.MESSAGE_EXTRAS,
MessageTable.VIEW_ONCE MessageTable.VIEW_ONCE
) )
.from(MessageTable.TABLE_NAME) .from("${MessageTable.TABLE_NAME} INDEXED BY $dateReceivedIndex")
.where( .where(
""" """
( (